JP6125701B1 - Non-uniform settlement prevention structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unequal settlement prevention structure capable of appropriately discharging groundwater with a simple structure. An unequal settlement prevention structure according to the present invention is an unequal settlement prevention structure in which a plurality of foundation piles are embedded in the ground, and each foundation pile has a plurality of water inlets on a peripheral surface portion and a bottom surface portion. A tube having a bottom with an opening at the upper end and a large number of water-permeable materials packed in the tube, and the water passages of the tube and gaps between the water-permeable material in the tube and the openings. It has a structure in which a water passage along the vertical direction is formed by communicating with each other, and only the groundwater is allowed to pass through while preventing the inflow of earth and sand into the tube by the water passage opening of the tube, and the groundwater can be appropriately sucked up. it can. [Selection] Figure 1

Description

  The present invention relates to an unequal settlement prevention structure for preventing a structure such as a detached house from sunk due to repeated vibration such as an earthquake.

  As a conventional unequal settlement prevention structure, as shown in Patent Document 1 below, a structure that promotes drainage of groundwater to prevent unequal settlement of a structure is known.

  The structure for preventing unequal settlement of Patent Document 1 is that a plurality of foundation piles made of wood piles, steel pipe piles, concrete piles, etc. are driven into the ground directly under the structure, and crushed stone or sand is placed between the outer peripheral surface of each foundation pile and the ground In this way, a cylindrical drain part is formed, and the drain part is formed on the outer periphery of the foundation pile in this way, groundwater is pumped through the drain part, and the ground is subsidized equally. It is intended to prevent uneven settlement.

JP 2012-188830 A

  However, in the unequal settlement prevention structure of Patent Document 1 above, the crushed stone and sand constituting the drain portion are in direct contact with the ground, and the gap between the crushed stone and sand is more prominent by the earth and sand constituting the ground. There is a problem that the drain portion becomes clogged and becomes inoperative.

  Moreover, depending on the groundwater pressure or water pressure, the earth and sand may be discharged together with the groundwater. For this reason, there is a problem that the ground is unevenly subtracted by the discharged earth and sand, or a cavity is formed in the ground.

  The present invention effectively solves the problems of the conventional unequal settlement prevention structure described above, and provides an unequal settlement prevention structure that can appropriately discharge groundwater with a simple structure.

In short, the unequal settlement prevention structure according to the present invention is an unequal settlement prevention structure in which a plurality of foundation piles supporting the structure is embedded in the ground directly under the structure, and each foundation pile is It consists of a bottomed tube with a large number of water inlets at the top and bottom and an opening at the upper end, and a large number of water-permeable materials stuffed into the tube. As the tube, synthetic resin fibers, carbon fibers, A knitted body of fibers having both rigidity and durability such as aramid fiber and metal fiber is used, and crushed stone or concrete shell or asphalt shell is used alone or mixed as the water-permeable material, and each foundation pile is a structure. while supporting the having a structure forming a water passage along the vertical direction communicates the gap between the water-permeable material within each passage Mizuguchi and the opening and the tube of the tube, the through of the tube Mizuguchi By the same While preventing the flow of sediment into the cube passes only groundwater can be properly sucked up groundwater.

  In addition, by embedding the lower ends of all the foundation piles in the liquefied ground layer, groundwater can be quickly discharged from both the peripheral surface portion and the bottom surface portion of the tube constituting each foundation pile, Even if liquefied, it is possible to promote equal settlement of the ground, thereby preventing unequal settlement of the structure.

  Alternatively, by burying the lower end portions of all the above-mentioned foundation piles or some of the above-mentioned foundation piles in the pile support ground layer, the groundwater can be sucked up and discharged while the structure is reliably supported.

  Preferably, a plurality of foundation pile groups in which a plurality of foundation piles are embedded in parallel at equal intervals are provided in parallel, and groundwater is evenly sucked and discharged.

  Or a structure having a plurality of foundation pile groups in which a plurality of foundation piles are embedded in parallel without gaps, or a structure in which a plurality of foundation piles are embedded in parallel with no gaps arranged in a lattice pattern By doing so, the foundation pile group can be brought into surface contact with the ground, and groundwater can be sucked up and discharged without leakage.

  Moreover, the horizontal member which is installed horizontally and is embedded on the upper end part of the foundation pile is provided, and the horizontal member is formed on the tube having the same configuration as the tube constituting the foundation pile and the water-permeable material in the same manner as the foundation pile. Each of the foundations is preferably formed by forming a water passage along the horizontal direction by the horizontal member, and preferably by disposing both ends of the horizontal member outward from the outer edge of the structure. Groundwater sucked up by piles can be discharged to the outside of the structure.

  In the unequal settlement prevention structure of the present invention, the foundation pile that originally supports the structure also serves as a water passage for sucking up and discharging the groundwater, so that the unequal settlement is effectively reduced even though it is a simple structure. Can be prevented.

  Moreover, since the surrounding surface part and bottom face part of the tube which comprises a foundation pile play the role of a filter, it suppresses appropriately that earth and sand of ground enter into a tube with groundwater. For this reason, the gap between the water-permeable materials is not clogged by the earth and sand.

  Moreover, foundation piles can be paralleled without gaps, and the ground piles can be discharged without leakage by bringing the parallel foundation piles into surface contact with the ground.

1 is a cross-sectional view schematically showing an uneven settlement prevention structure according to the present invention. The perspective view of the tube which comprises a foundation pile. (A) is a perspective view of a foundation pile, (B) is an expanded sectional view of a foundation pile. The perspective view of a horizontal member. Sectional drawing which shows the example which embed | buried the lower end part of the foundation pile in the pile support ground layer. The bottom view which shows arrangement | positioning of the foundation pile in FIG. Sectional drawing which outlines the other examples of the unequal settlement prevention structure which concerns on this invention. The bottom view which shows arrangement | positioning of the foundation pile in FIG. It is a figure which shows the other example of arrangement | positioning of a foundation pile, (A) is an example which arrange | positioned the foundation pile group which arranged the several foundation pile in parallel in the grid | lattice form, (B) is a plurality of foundation piles arranged in parallel without a gap. An example in which a foundation pile group and a foundation pile group in which a plurality of foundation piles are arranged at equal intervals is alternately arranged is shown. Explanatory drawing which shows the suspended state of the tube in a foundation pile formation process. Explanatory drawing which shows the other example of the suspended state of the tube in a foundation pile formation process.

  Hereinafter, an optimal embodiment of the unequal settlement prevention structure according to the present invention will be described with reference to FIGS.

<Basic configuration>
The unequal settlement prevention structure according to the present invention is based on the premise that a plurality of foundation piles 1 are buried in the ground G directly under a building structure H such as a detached house, as shown in FIGS. A water passage along the vertical direction is formed in each foundation pile 1, and in the event of an earthquake, groundwater is sucked up and discharged through the water passage in each foundation pile 1, and the subsidence of the ground G is promoted. Prevents uneven settlement of the structure H.

  Preferably, a horizontal member 7 is provided horizontally on the upper end portion 1b of each foundation pile 1, a water passage along the horizontal direction is formed by the horizontal member 7, and is sucked up by the foundation pile 1. Drain the groundwater appropriately to the outside of the structure H.

  As shown in FIGS. 1, 5, 7, etc., both end portions 7 a and 7 b of the lateral member 7 are arranged so as to be located outside the structure H. Further, between the horizontal member 7 and the foundation B of the structure H, a water-stopping layer 8 is formed by a known solid water-stopping material such as a known water-stopping material such as a rubber sheet or a main material and a curing agent. The water stop layer 8 is used to stop water with respect to the foundation B, and the ground water is guided to both end portions 7a and 7b of the horizontal member 7.

<Configuration of foundation pile>
As shown in FIGS. 2 and 3, the foundation pile 1 includes a bottomed tube 2 having a plurality of water inlets 3 on the peripheral surface portion 2a and the bottom surface portion 2b and an opening 4 on the upper end portion, The permeable material 5 is a block of water filled in the tube 2, and the water passages along the vertical direction are communicated with each of the water flow ports 3 of the tube 2 and the openings 4 and the gaps between the water permeable materials 5 in the tube 2. Form.

  As shown in the enlarged view of FIG. 2, the tube 2 constituting the foundation pile 1 is preferably formed by knitting the converging fibers 6 in which the fibers 6a are concentrated, that is, knitting into a sheet by flat knitting, or cylindrical by knitting, etc. The stitch is used as the water inlet 3. The diameter of the water inlet 3 is adjusted so that groundwater can pass through while preventing the inflow of earth and sand from the ground G. Furthermore, it adjusts suitably also with the particle size of the water-permeable material 5 mentioned later.

  As the fiber 6a constituting the tube 2, for example, a fiber having both rigidity and durability such as a synthetic resin fiber, a carbon fiber, an aramid fiber, and a metal fiber is used. It is optional depending on the implementation to form the tube 2 by knitting the fibers 6a as single fibers.

  When the tube 2 is knitted into a sheet shape, the fiber knitted body knitted into a sheet shape is formed into a cylindrical shape to form the peripheral surface portion 2a, and the bottom surface portion 2b is bonded or stitched. Further, when the tube 2 is formed by knitting in a cylindrical shape, the peripheral surface portion 2a is already formed, and the bottom surface portion 2b is bonded or stitched thereafter.

  As described above, the tube 2 can be formed of a fiber knitted body, a synthetic resin sheet, a synthetic rubber sheet, or the like. Thus, when forming with a synthetic resin sheet, a synthetic rubber sheet, etc., the water flow opening 3 of a moderate magnitude | size is drilled in the surrounding surface part 2a and the bottom face part 2b. Moreover, the length, the cross-sectional shape, and the cross-sectional diameter of the tube 2 can be appropriately adjusted according to the site. Furthermore, it does not exclude that the peripheral surface portion 2a and the bottom surface portion 2b of the tube 2 are members having different configurations (members having different materials and structures).

  As the water permeable material 5 to be packed in the tube 2 (filled in the middle), massive water permeable material such as crushed stone, concrete shell or asphalt shell is used singly or in combination, and the rigidity and water permeability of the foundation pile 1 are used. To achieve both. In particular, if concrete shells or asphalt shells are used, costs can be reduced and the construction waste can be recycled.

  Further, the particle size of the water permeable material 5 is set to be larger than the diameter of the water passage 3 described above. Only the water-permeable material 5 having the same particle diameter is packed in the tube 2 to secure the total volume of the gap while adjusting the size of the gap generated between the adjacent water-permeable materials 5 to some extent, or the water-permeable materials having different particle diameters. 5 can be mixed and packed in the tube 2, and the water-permeable material 5 can be packed tightly to ensure the strength of the foundation pile 1. Anyway, it can adjust suitably by the arrangement position etc. of the foundation pile 1 to form.

  In the step of forming the foundation pile 1 by stuffing the water permeable material 5 into the tube 2, as shown in FIGS. 10 and 11, the tube 2 is suspended by the suspension means 9, and the suspended tube 2 is in the suspended state. The foundation pile 1 is formed by charging and filling the water-permeable material 5 described above. It is natural to compact the stuffed water-permeable material 5 as necessary. The suspension means 9 is not particularly limited as long as the tube 2 can be suspended and the water permeable material 5 can be packed into the suspended tube 2 from the opening 4. A crane or the like can be used.

  FIG. 10 shows an example in which the bottom surface 2b of the tube 2 is received and supported on the surface of the ground G, and the tube 2 is suspended. FIG. 11 shows an example in which the bottom surface 2b of the tube 2 is received and supported by the bottom surface of the excavation hole 10 or the excavation groove 10 ′ formed in the ground G, and the tube 2 is suspended. In the case of these tube hanging examples, after the water-permeable material 5 is packed, the weight of the tube 2 and the water-permeable material 5 is partially received by the surface of the ground G as the load receiving surface and the bottom surface of the excavation hole 10 and the excavation groove 10 '. And the weight concerning the suspension means 9 can be reduced.

  In addition, the tube suspension example described with reference to FIGS. 10 and 11 above, that is, the ground surface or excavation is performed in addition to supporting the bottom surface portion 2b of the tube 2 in the ground or in the excavation hole 10 / excavation groove 10 ′. The bottom surface 2b of the tube 2 may be made free in the hole 10 / excavation groove 10 ′, that is, suspended in the air.

  As described above, the foundation pile 1 according to the present invention can be easily formed on-site, and the construction period can be shortened and the cost can be reduced. Moreover, it can form in the excavation hole 10 and the excavation groove 10 ', and formation and embedding of the foundation pile 1 can be performed seamlessly. In particular, when the foundation piles 1 are formed in the excavation groove 10 ′, the foundation piles 1 can be embedded in parallel without gaps as in the arrangement example described later.

  And the foundation pile 1 in this invention connects the clearance gap between the water permeable material 5 in each water-flow opening 3 and opening 4 of the tube 2 which comprises the said foundation pile 1, and the same tube 2, and the water flow path along the perpendicular direction. It is possible to allow only the groundwater to pass through the water inlet 3 while appropriately preventing the inflow of earth and sand into the tube 2 by the peripheral surface portion 2a and the bottom surface portion 2b of the tube 2 and sucking up the groundwater appropriately.

  In addition, the cross-sectional shape in the direction orthogonal to the longitudinal direction of the foundation pile 1 is not limited to the circular shape, and may be, for example, an elliptical shape or a polygonal shape.

<Configuration of horizontal members>
The horizontal member 7 is preferably formed by packing a plurality of water-permeable materials 5 in the tube 2 having the same configuration as the tube constituting the foundation pile 1 as described above in the same manner as the foundation pile 1 described above. Form. Therefore, about the tube 2, the water-permeable material 5, and a formation process, the description content in the "structure of a foundation pile" mentioned above is used.

  In the horizontal member 7, after the tube 2 is suspended and the water-permeable material 5 is inserted and packed, the opening 4 may be closed by the upper surface portion 2c. That is, the upper surface portion 2c can be bonded or stitched so as to close the opening 4 after the numerous water-permeable materials 5 are packed in the tube 2. In addition, many water-flow ports 3 are provided also in the upper surface part 2c.

  In the present invention, the horizontal member 7 having the above configuration is placed on the upper ends 1b of the plurality of foundation piles 1 embedded in parallel, that is, on the openings 4 of the tubes 2 in the plurality of foundation piles 1. It embeds and forms the water flow path along the horizontal direction connected to the water flow path along the vertical direction of each foundation pile 1 mentioned above. Thereby, the groundwater sucked up by each foundation pile 1 can be discharged to the outside of the structure H. That is, the groundwater sucked up by each foundation pile 1 is guided along the horizontal direction from the opening 4 of each foundation pile 1 through the water inlet 3 formed in the peripheral surface portion 2a of the tube 2 constituting the lateral member 7, It discharges from the one end part 7a of the installation member 7, and / or the other end part 7b.

  Preferably, both end portions 7a and 7b of the lateral member 7 are arranged outward from the outer edge of the structure H, so that groundwater can be reliably discharged to the outside of the structure H. In addition, it cannot be overemphasized that the bottom face part 2b of the tube 2 which comprises this horizontal member 7, the opening 4, or the upper surface part 2c is distribute | arranged to the both ends 7a * 7b of the horizontal member 7, respectively.

  The cross-sectional shape in the direction orthogonal to the longitudinal direction of the lateral member 7 is not limited to a circular shape, and may be, for example, an elliptical shape or a polygonal shape.

<Example of foundation pile burial>
Next, the example of embedding the foundation pile 1 of an above-described structure is demonstrated.

  FIG. 1 shows an example in which the lower ends 1a of all foundation piles 1 are embedded in the liquefied ground layer g1. That is, the example which supported all the foundation piles 1 by the liquefied ground layer g1 is shown. In the case of this example, groundwater can be quickly sucked not only through the water inlet 3 of the peripheral surface 2a of the tube 2 constituting each foundation pile 1 but also the water outlet 3 of the bottom 2b. Therefore, it is possible to prevent the liquefied ground layer g1 from liquefying, and even if liquefied, the ground water is quickly sucked up to prompt the ground G to settle down, and the structure H is appropriately prevented from sinking unevenly. be able to.

  FIG. 2 shows an example in which the lower end portions 1a of all the foundation piles 1 are embedded in the pile supporting ground layer g2. That is, the example which supported all the foundation piles 1 by the support ground layer g2 is shown. In the case of this example, groundwater can be sucked up while each structure pile 1 is supporting the structure H reliably.

  In addition, although the example of embedding the above-mentioned foundation pile 1 showed the example which embeds the lower end part 1a of all the foundation piles 1 in the liquefied ground layer g1 or the pile support ground layer g2, it exists in this invention. Not limited to this, the lower end part 1a of a part (a part number) of the foundation piles 1 is embedded in the liquefied ground layer g1, and the lower end part 1a of the remaining foundation piles 1 is embedded in the pile supporting ground layer g2. Is also optional depending on implementation.

  In addition, as shown in the figure, the foundation pile 1 is buried in the excavation hole 10 or the excavation groove 10 ′, or the foundation pile 1 is driven in by embedding the ground G with a water jet while being ground. It is also possible to embed by pressing 1 into the ground G.

<Example of foundation pile arrangement>
Finally, an arrangement example of the foundation pile 1 having the above-described configuration will be described.

  1, 5 and 6 show examples of arrangement in which a plurality of foundation piles 1 are buried in parallel at equal intervals. Thus, by setting it as the structure which has two or more foundation pile groups which consist of a plurality of foundation piles 1 buried in parallel at equal intervals, ground water can be sucked up and discharged equally.

  Moreover, FIG. 7, FIG. 8 has shown the example of arrangement | positioning which embed | buried the some foundation pile 1 in parallel without gap. In this way, by having a structure having a plurality of foundation pile groups consisting of a plurality of foundation piles 1 buried in parallel without gaps, the foundation pile group is brought into surface contact with the ground G, and the groundwater is sucked up without leakage. Can be discharged.

  In the present invention, as shown in FIG. 9 (A), a structure in which a group of foundation piles composed of a plurality of foundation piles 1 embedded in parallel without gaps is arranged in a grid pattern, (B) As shown in (B), the foundation has a plurality of foundation piles composed of a plurality of foundation piles 1 embedded in parallel at equal intervals, and includes a plurality of foundation piles 1 embedded in parallel without a gap. It can also be set as the structure which has multiple pile groups in parallel, and according to the expected groundwater discharge, the some foundation pile 1 can be arrange | positioned freely.

  In particular, since the foundation pile 1 according to the present invention can be formed in the excavation groove 10 ′ formed in the ground G, it is easy to bury and bury a plurality of foundation piles 1 without gaps.

DESCRIPTION OF SYMBOLS 1 ... Foundation pile, 1a ... Lower end part, 1b ... Upper end part, 2 ... Tube, 2a ... Peripheral surface part, 2b ... Bottom surface part, 2c ... Upper surface part, 3 ... Water inlet, 4 ... Opening, 5 ... Permeable material, 6 ... Bundled fiber, 6a ... fiber, 7 ... horizontal member, 7a ... one end, 7b ... other end, 8 ... water blocking layer, 9 ... suspending means, 10 ... excavation hole, 10 '... excavation groove, H ... structure Thing, B ... structural foundation, G ... ground, g1 ... liquefied ground layer, g2 ... pile supporting ground layer.

Claims (8)

An uneven settlement prevention structure in which a plurality of foundation piles supporting the structure is embedded in the ground directly under the structure, each foundation pile having a plurality of water inlets on a peripheral surface portion and a bottom surface portion and at an upper end portion A fiber having both rigidity and durability, such as a synthetic resin fiber, a carbon fiber, an aramid fiber, a metal fiber, etc., comprising a bottomed tube having an opening and a large number of water-permeable materials packed in the tube. The crushed stone, concrete shell or asphalt shell is used alone or in combination as the water permeable material, and the foundation piles support the structure and the water inlets and openings of the tube. An uneven settlement prevention structure characterized in that a water passage along the vertical direction is formed by communicating a gap between the water permeable materials in the tube. All uneven settlement prevention structure of claim 1 Symbol mounting the lower end of the foundation pile, characterized in that embedded in the liquefied soil layer. All of the foundation pile or uneven settlement prevention structure of claim 1 Symbol mounting the lower end of the part of the foundation pile, characterized in that embedded in the pile supporting ground layer. The uneven settlement prevention structure according to any one of claims 1 to 3 , wherein a plurality of foundation pile groups in which a plurality of foundation piles are buried in parallel at equal intervals are provided in parallel. The unequal settlement prevention structure according to any one of claims 1 to 3 , further comprising a plurality of foundation pile groups in which a plurality of the foundation piles are embedded in parallel without gaps. The unequal settlement prevention structure according to any one of claims 1 to 3, wherein a group of foundation piles in which a plurality of the foundation piles are embedded in parallel without gaps are arranged in a lattice shape. A horizontal member that is horizontally installed and embedded on the upper end portion of the foundation pile is provided, and the horizontal member is packed in the tube having the same configuration as the tube constituting the foundation pile in the same manner as the foundation pile. The unequal settlement prevention structure according to any one of claims 1 to 6, wherein a water passage along the horizontal direction is formed by the transverse member. 8. The uneven settlement prevention structure according to claim 7 , wherein both ends of the lateral member are arranged outward from the outer edge of the structure.

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