Pile construction method

Abstract

To provide a construction method of a pile body capable of improving workability of the pile body.SOLUTION: A construction method of a pile body 30 is to construct the pile body 30 such that the pile body 30 traverses a first ground 10 and a second ground 20 different from the first ground 10 in hardness, including: a burying step of burying a suppression body 40 suppressing bending of the pile body 30 in the first ground 10 and the second ground 20; and an installing step of installing the pile body 30 at a position where the bending of the pile body 30 can be suppressed by the suppression body 40 using a pile driving device.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for constructing a pile body. [Background technology]

[0002] Conventionally, one technique proposed for constructing pile bodies in the ground involves forming pile holes in the ground using a pile driver and then inserting the pile body into the pile holes (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-240056 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, in the above-mentioned conventional technology, as mentioned above, pile holes are simply formed in the ground using a pile driver. Therefore, for example, when constructing a pile body across two grounds of different hardness, the harder of the two grounds may cause the pile hole to bend, which may result in the pile body being inserted into the pile hole being bent. Therefore, there is room for improvement in terms of improving the workability of the pile body.

[0005] The present invention has been made in view of the above, and aims to provide a pile construction method that makes it possible to improve the workability of the pile. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the pile construction method described in claim 1 is a construction method for constructing a pile so that the pile crosses a first ground and a second ground having a hardness different from that of the first ground, and a restraining body for restraining bending of the pile is provided in the first ground. anda step of burying the cable in the second ground, and after the step of burying the cable, using a pile driving means Before an installation step of installing the pile body; The restraining body is a long body made of wood or hardened cement, and in the embedding step, the restraining body having a uniform hardness is embedded across the first ground and the second ground, and in the installation step, the pile body is installed within the restraining body, thereby making it possible to suppress bending of the pile body.

[0007] The pile construction method according to claim 2 comprises: A construction method for constructing a pile body so that the pile body crosses a first ground and a second ground having a different hardness from the first ground, the construction method comprising: an embedding step of embedding an inhibitor that suppresses bending of the pile body into the first ground and / or the second ground; and an installation step of installing the pile body using a pile driving means after the embedding step, wherein the inhibitor is a long body made of steel, wood, or hardened cement; in the embedding step, a plurality of inhibitors having a hardness equal to or greater than that of the second ground are embedded in the first ground separated from the second ground and having a hardness lower than that of the second ground; and in the installation step, the pile body is installed in a position that does not overlap with the plurality of inhibitors and is surrounded by the second ground and the plurality of inhibitors, thereby making it possible to prevent the pile body from bending toward the first ground.

[0008] The pile construction method according to claim 3 is the pile construction method according to claim 1 or 2, The planar size of the restraining body is determined based on the overlapping area between the pile body and the second ground, the diameter of the auger part of the pile driving means, and / or the number of the restraining bodies.

[0009] The pile construction method according to claim 4 is the pile construction method according to any one of claims 1 to 3, The vertical length of the restraining body is set to be equal to or less than the shorter of either the vertical length of the first ground or the vertical length of the second ground.

[0010] The pile construction method according to claim 5 comprises: Claims 1 to 4 In the construction method of the pile body according to any one of the above, After the installation step, a removal step of removing the suppressor is included. [Effects of the Invention]

[0013] According to the pile construction method of claim 1, the restraining body is and The method includes an embedding step of embedding the pile in the second ground, and an installation step of using pile driving means to install the pile in a position where the restraining body can prevent the pile from bending, so when installing the pile using the pile driving means, the restraining body makes it easier to form the pile hole so that it is roughly aligned in the vertical direction, thereby preventing the pile from bending. This makes it possible to improve the workability of the pile. Furthermore, in the embedding step, a suppressor having a uniform hardness is embedded across the first and second ground, and in the installation step, the pile body is installed inside the suppressor, so that when the pile hole is formed, the uniform hardness of the suppressor makes it difficult for the magnitude of the horizontal resistance of the suppressor acting on the auger part of the pile driving means to differ, thereby preventing the pile hole from bending. Therefore, it becomes possible to more effectively suppress bending of the pile body. Furthermore, since the suppressor is made of wood or hardened cement, it can be constructed easily and inexpensively, and the productivity of the suppressor can be improved.

[0014] According to the pile construction method described in claim 2, The method includes an embedding step of embedding the restraining body in the first ground and / or the second ground, and an installation step of using pile driving means to install the pile body in a position where the restraining body can prevent the pile body from bending, so when the pile body is installed using the pile driving means, the restraining body makes it easier to form a pile hole that is approximately aligned in the vertical direction, thereby preventing the pile body from bending. This makes it possible to improve the workability of the pile body. In addition, in the embedding step, a suppressor having a hardness equal to or greater than that of either the first ground or the second ground is embedded in either the first ground or the second ground at a distance from the other of the first ground or the second ground, and in the installation step, the pile body is installed in a position that does not overlap with the suppressor. Therefore, for example, when a pile hole is formed, the auger part of the pile driving means is sandwiched between the suppressor having a relatively high hardness and the first ground or the second ground, and the movement of the auger part can be guided substantially along the vertical direction, thereby preventing the pile hole from bending. Therefore, it is possible to more effectively suppress bending of the pile body. Furthermore, since the suppressor is made of steel, wood, or hardened cement, it can be constructed easily and inexpensively, and the productivity of the suppressor can be improved.

[0015] According to the pile construction method described in claim 3, The planar size of the restraining body is determined based on the overlapping area between the pile body and the second ground, the diameter of the auger part of the pile driving means, and / or the number of restraining bodies, so that the planar size of the restraining body can be appropriately set, and bending of the pile body can be effectively suppressed.

[0016] According to the pile construction method described in claim 4, Since the vertical length of the restraining body is set to be less than the shorter of either the vertical length of the first ground or the vertical length of the second ground, the vertical length of the restraining body can be set appropriately, and bending of the pile body can be more effectively suppressed.

[0017] According to the pile construction method described in claim 5, Since the installation process includes a removal process for removing the inhibitor, the inhibitor can be removed from the first ground and / or the second ground, thereby preventing the inhibitor from disturbing the surrounding environment of the first ground and / or the second ground. [Brief explanation of the drawings]

[0020] [Figure 1] 1A and 1B are schematic diagrams showing a pile body and a restraining body according to a first embodiment of the present invention, in which (a) is a side view (partially shown in cross section) and (b) is a plan view. [Figure 2] 1A and 1B are diagrams showing the embedding step of the pile construction method according to the first embodiment, in which (a) is a side view (partially shown in cross section) and (b) is a plan view. [Figure 3] 1A and 1B are diagrams showing an installation process of a pile construction method according to the first embodiment, in which (a) is a side view (partially shown in cross section) and (b) is a plan view. [Figure 4] 10A and 10B are schematic diagrams showing a pile body and a restraining body according to a second embodiment, in which (a) is a side view (partially shown in cross section) and (b) is a plan view. [Figure 5] 10A and 10B are diagrams showing the embedding step of the pile construction method according to the second embodiment, in which (a) is a side view (partially shown in cross section) and (b) is a plan view. [Figure 6] 10A and 10B are diagrams showing the installation process of the pile construction method according to the second embodiment, in which (a) is a side view (partially shown in cross section) and (b) is a plan view. [Figure 7] 10A and 10B are diagrams showing the removal process of the pile construction method according to the second embodiment, in which (a) is a side view (partially shown in cross section) and (b) is a plan view. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, with reference to the accompanying drawings, an embodiment of the pile construction method according to the present invention will be described in detail. First, [I] the basic concept of the embodiment will be explained, then [II] specific details of the embodiment will be explained, and finally, [III] modified examples of the embodiment will be explained. However, the present invention is not limited to the embodiment.

[0022] [I] Basic Concept of the Embodiment First, the basic concept of the embodiment will be described. The embodiment generally relates to a construction method for constructing a pile so that the pile crosses a first ground and a second ground having a hardness different from that of the first ground.

[0023] Here, a "pile" is a construction member that transmits the load of a structure built on the ground to a specific stratum in the ground in order to prevent the structure from sinking.

[0024] Furthermore, the specific structure and type of the "structure" constructed using this pile body are arbitrary, and the concept includes, for example, apartment complexes such as condominiums, office buildings, commercial facilities, logistics facilities, and public facilities, but in the embodiment, it will be described as a logistics facility.

[0025] Furthermore, "the pile body crosses the first ground and the second ground" means that the pile body is placed across the first ground and the second ground.

[0026] [II] Specific details of the embodiment Next, specific details of the embodiment will be described.

[0027] First Embodiment First, a description will be given of a construction method of a pile body according to embodiment 1. In this embodiment 1, a restraining body is buried across the first ground and the second ground.

[0028] (Configuration - Construction target area) First, the configuration of a construction area 1 in which a pile body 30 according to the first embodiment, which will be described later, is to be constructed will be described.

[0029] In the following explanation, the X direction in Figure 1 will be referred to as the left-right direction of the construction target area 1 (the -X direction will be referred to as the left direction of the construction target area 1, and the +X direction will be referred to as the right direction of the construction target area 1), the Y direction in Figure 1 will be referred to as the front-to-back direction of the construction target area 1 (the +Y direction will be referred to as the front direction of the construction target area 1, and the -Y direction will be referred to as the rear direction of the construction target area 1), and the Z direction in Figure 1 will be referred to as the up-down direction of the construction target area 1 (the +Z direction will be referred to as the upward direction of the construction target area 1, and the -Z direction will be referred to as the downward direction of the construction target area 1).

[0030] The construction area 1 is an area where a structure (specifically, a logistics facility) (not shown) will be installed, and includes a first ground 10 and a second ground 20.

[0031] (Configuration - Construction area - First ground) The first ground 10 is a part of the ground that constitutes the construction target area 1. This first ground 10 is made up of, for example, the existing ground within the construction target area 1, and as shown in Fig. 1, is provided in the entire area of ​​the construction target area 1 except for the second ground 20, and is provided so as to partially overlap with the pile bodies 30 described below.

[0032] (Configuration - Construction area - Second ground) The second ground 20 is another part of the ground constituting the construction target area 1, and is ground having a different hardness from the first ground 10. This second ground 20 is composed of, for example, a known ground improvement body, specifically, a ground improvement body consisting of a stabilizer containing a cement-based solidification material or the like (hereinafter referred to as "stabilizer") and soil of the existing ground within the construction target area 1, and is composed of a ground improvement body having a higher hardness than the hardness of the first ground 10. As shown in FIG. 1(b), this second ground 20 is provided in the construction target area 1 so as to partially overlap with pile bodies 30, which will be described later.

[0033] Furthermore, the specific shape and size of the second ground 20 are arbitrary, but in the first embodiment they are set as follows.

[0034] That is, the planar shape of the second ground 20 is set to a substantially circular shape as shown in Fig. 1(b) , but is not limited to this, and may be set to, for example, a polygonal shape (for example, a triangular shape, a rectangular shape, etc.) or an elliptical shape.

[0035] 1(b), the diameter of the second ground 20 is set to be smaller than the length in the left-right direction (or the length in the front-back direction) of the first ground 10. However, this is not limiting, and the diameter may be set to be, for example, equal to or larger than the length in the left-right direction (or the length in the front-back direction) of the first ground 10.

[0036] Furthermore, the vertical length of the second ground 20 is set to be shorter than the vertical length of the first ground 10, as shown in Figure 1(a), and may be set to, for example, approximately 20 to 30 m.

[0037] Furthermore, the method for forming the second ground 20 is arbitrary, but it may be formed, for example, by mixing a stabilizer with soil from the existing ground within the construction area 1 and solidifying the mixture.

[0038] (Composition - pile body) Next, the configuration of the pile body 30 will be described.

[0039] The pile body 30 is constructed, for example, using a long, well-known construction pile material (for example, a steel pipe pile, a PHC pile, or a PRC pile), and as shown in Figure 1, is arranged inside a pile hole 31 formed in the construction area 1 so that the longitudinal direction of the pile body 30 is approximately aligned in the vertical direction.

[0040] The pile hole 31 is a hole for inserting the pile body 30, and as shown in Figure 1, it is formed so as to cross the first ground 10 and the second ground 20, and specifically, it is formed so as to extend vertically downward from the ground surface of these grounds.

[0041] Furthermore, the specific shapes and sizes of the pile body 30 and the pile hole 31 are arbitrary, but in the first embodiment they are set as follows.

[0042] That is, the planar shapes of the pile body 30 and the pile hole 31 are set to be approximately circular as shown in Fig. 1(b). However, without being limited to this, they may be set to be polygonal (for example, triangular, rectangular, etc.) or elliptical.

[0043] As shown in Fig. 1(b), the diameters of the pile body 30 and the pile hole 31 are set to be smaller than the diameter of the second ground 20. For example, the diameters of the pile body 30 and the pile hole 31 may be substantially the same and may be set to about half the diameter of the second ground 20. However, this is not limiting, and for example, they may be set to be equal to or larger than the diameter of the second ground 20.

[0044] As shown in Fig. 1(a), the vertical lengths of the pile body 30 and the pile hole 31 are set to be longer than the vertical length of the second ground 20. For example, the vertical lengths of the pile body 30 and the pile hole 31 may be approximately the same, and may be set to be approximately 25 m to 40 m.

[0045] (configuration-inhibitor) Next, the configuration of the suppressor 40 will be described.

[0046] The restraining body 40 is intended to restrain bending of the pile body 30. The restraining body 40 is formed as a long body and is provided in the first ground 10 and / or the second ground 20. Specifically, as shown in FIG. 1 , one restraining body 40 is buried across the first ground 10 and the second ground 20 so that the longitudinal direction of the restraining body 40 is approximately along the vertical direction, and is provided so as to overlap the entire pile hole 31.

[0047] Furthermore, the specific shape and size of suppressor 40 are arbitrary, but in the first embodiment they are set as follows.

[0048] That is, the planar shape of the suppressor 40 is set to a substantially circular shape as shown in Fig. 1(b), but is not limited to this, and may be set to, for example, a polygonal shape (e.g., a triangular shape, a rectangular shape, etc.) or an elliptical shape.

[0049] In addition, the diameter size (planar size) of the restraining body 40 is set based on the overlapping area between the pile body 30 and the second ground 20, the diameter of the auger part of the pile driving device (not shown), and / or the number of restraining bodies 40.

[0050] The pile driving device is a pile driving means for installing the pile body 30 in the construction area 1, and is configured using, for example, a known pile driving device (for example, a pile driver equipped with an auger section and a crane section).

[0051] Specifically, the distance may be set to be larger as the overlapping area (or the diameter of the auger portion) increases, and / or may be set to be smaller as the number of suppressing bodies 40 increases.

[0052] For example, the diameter of the restraining body 40 may be set based on the overlapping area between the pile body 30 and the second ground 20, the diameter of the auger part of the pile driving device, and the number of restraining bodies 40. In detail, as shown in Fig. 1(b), since the overlapping area is less than 1 / 8 of the area of ​​the pile body 30 in the planar direction, the diameter of the auger part of the pile driving device is about half the diameter of the second ground 20, and the number of restraining bodies 40 is one, the diameter of the restraining body 40 may be set to be larger than the diameter of the pile hole 31 and smaller than the diameter of the second ground 20.

[0053] This allows the diameter of the restraining body 40 to be set appropriately, and bending of the pile body 30 can be effectively suppressed.

[0054] Furthermore, the vertical length of the suppressor 40 is set to be equal to or less than the shorter of either the vertical length of the first ground 10 or the vertical length of the second ground 20 .

[0055] Specifically, as shown in Figure 1(a), it is set shorter than the vertical length of the second ground 20, which is shorter than the vertical length of the first ground 10. More specifically, it is set based on the vertical length of the auger part of the pile driver and the overlapping area between the second ground 20 and the auger part of the pile driver, and more specifically, it is set shorter as the vertical length of the auger part increases, and longer as the overlapping area increases.

[0056] For example, if the vertical length of the auger section is approximately the same as the vertical length of the pile hole 31 and the overlap area is less than 1 / 8 of the planar area of ​​the pile body 30, it may be set to approximately 5 m to 15 m.

[0057] This allows the vertical length of the restraining body 40 to be appropriately set, and bending of the pile body 30 can be effectively suppressed.

[0058] Furthermore, the specific configuration of the suppressor 40 is arbitrary, but in the first embodiment, it is made of steel, wood, or hardened cement.

[0059] Specifically, it is made of a long hardened cement body with uniform hardness, and may be made of, for example, mortar or concrete, and may be made of a hardened cement body with a hardness higher than that of the first ground 10 and lower than that of the second ground 20. However, without being limited to this, it may be a hardened cement body with a hardness lower than that of the first ground 10, or a hardened cement body with a hardness higher than that of the second ground 20, for example.

[0060] With this configuration, the suppressor 40 can be constructed simply and inexpensively, and the productivity of the suppressor 40 can be improved.

[0061] (Pile construction method) Next, a construction method for the pile body 30 according to the first embodiment will be described.

[0062] This construction method for the pile body 30 is a method for constructing the pile body 30 so that the pile body 30 crosses the first ground 10 and the second ground 20, and includes an embedding process and an installation process, as shown in Figures 1 to 3.

[0063] In addition, the construction method of the pile body 30 will be described assuming that the first ground 10 and the second ground 20 have already been established in the construction area 1 (note that the construction method of the pile body 130 relating to embodiment 2 described below is approximately the same).

[0064] (Pile construction method - Burial process) First, the embedding step will be described.

[0065] The embedding step is a step of embedding the suppressor 40 in the first ground 10 and / or the second ground 20.

[0066] Specifically, first, using a known drilling device (not shown), a borehole 41 (specifically, a borehole 41 having a substantially circular planar shape) is formed across the first ground 10 and the second ground 20. For example, the borehole 41 may be formed so that the overlapping area between the borehole 41 and the second ground 20 is approximately ¼ of the planar area of ​​the borehole 41. Next, using a known transport means (not shown) (e.g., a concrete mixer truck), mortar or concrete manufactured in a factory or the like is transported to the construction area 1, and then using a known injection device (not shown), the mortar or concrete transported by the transport means is injected into the borehole 41. Next, the injected mortar or concrete is cured for a predetermined period of time to solidify (i.e., the inhibitor 40 is formed on-site and buried).

[0067] Through this series of operations, as shown in Figure 2, one inhibitor 40 (specifically, a cement hardened body) having an approximately circular planar shape is buried across the first ground 10 and the second ground 20 so that the longitudinal direction of the inhibitor 40 is approximately aligned in the vertical direction.

[0068] As described above, the diameter (planar size) of the restraining body 40 is set based on the overlapping area between the pile body 30 and the second ground 20, the diameter of the auger part of the pile driving device, and the number of restraining bodies 40. As described above, the vertical length of the restraining body 40 is set shorter than the vertical length of the second ground 20, which is shorter than the vertical length of the first ground 10.

[0069] (Pile construction method - installation process) Next, the installation process will be described.

[0070] The installation step is a step of installing the pile body 30 using a pile driving device after the embedding step at a position where the restraining body 40 can restrain bending of the pile body 30 .

[0071] Specifically, first, a pile driving device is installed in the construction area 1. Next, the pile hole 31 is formed by the auger part of the pile driving device so as to cross the first ground 10 and the second ground 20. More specifically, as shown in FIG. 3 , the pile hole 31 is formed in the restraining body 40 so that the center point of the restraining body 40 and the center point of the pile hole 31 coincide with each other. Next, the pile body 30 is inserted into the pile hole 31 by the crane part of the pile driving device.

[0072] By this series of operations, as shown in Fig. 1, the pile body 30 is installed at a position (specifically, a position within the restraining body 40) where bending of the pile body 30 can be suppressed. Therefore, when the pile hole 31 is formed, since the hardness of the restraining body 40 is uniform, there is little difference in the magnitude of the resistance in the horizontal direction (specifically, left-right direction, front-back direction, etc.) of the restraining body 40 acting on the auger part of the pile driving device, it is possible to avoid the occurrence of bending of the pile hole 31. Therefore, it is possible to effectively suppress bending of the pile body 30.

[0073] In the first embodiment, after the installation step, the restraining body 40 is left buried without being removed from the borehole 41. This eliminates the need to remove the restraining body 40, and improves the workability of the construction method for the pile body 30.

[0074] According to the above-described construction method of the pile body 30, when the pile body 30 is installed using a pile driving device, the restraining body 40 makes it easier to form the pile hole 31 so that it is substantially aligned in the vertical direction, thereby preventing bending of the pile body 30. Therefore, it is possible to improve the workability of the pile body 30.

[0075] (Effects of the First Embodiment) Thus, according to the first embodiment, the method includes an embedding step of embedding the suppressor 40 in the first ground 10 and / or the second ground 20, and an installation step of using a pile driving device to install the pile 30 in a position where the suppressor 40 can suppress bending of the pile 30 after the embedding step. Therefore, when installing the pile 30 using the pile driving device, the suppressor 40 makes it easier to form the pile hole 31 so that it is substantially aligned in the vertical direction, thereby suppressing bending of the pile 30. Therefore, it is possible to improve the workability of the pile 30.

[0076] Furthermore, the planar size of the restraining body 40 is determined based on the overlapping area between the pile body 30 and the second ground 20, the diameter of the auger part of the pile driving device, and / or the number of restraining bodies 40, so that the planar size of the restraining body 40 can be appropriately set, and bending of the pile body 30 can be effectively suppressed.

[0077] Furthermore, since the vertical length of the restraining body 40 is set to be equal to or less than the shorter of either the vertical length of the first ground 10 or the vertical length of the second ground 20, the vertical length of the restraining body 40 can be appropriately set, and bending of the pile body 30 can be more effectively suppressed.

[0078] Furthermore, in the embedding step, the suppressor 40 having a uniform hardness is embedded across the first ground 10 and the second ground 20, and in the installation step, the pile body 30 is installed in the suppressor 40. Therefore, when the pile hole 31 is formed, the suppressor 40 has a uniform hardness, which makes it difficult for the magnitude of the horizontal resistance of the suppressor 40 acting on the auger part of the pile driving device to vary, thereby preventing the pile hole 31 from bending. Therefore, it becomes possible to more effectively suppress bending of the pile body 30.

[0079] Furthermore, since the suppressor 40 is made of steel, wood, or hardened cement, the suppressor 40 can be constructed simply and inexpensively, and the productivity of the suppressor 40 can be improved.

[0080] Second Embodiment Next, a construction method of a pile body according to embodiment 2 will be described. In this embodiment 2, the restraining body is buried in either the first ground or the second ground at a distance from the other of the first ground or the second ground. However, the configuration of this embodiment 2 is substantially the same as the configuration of embodiment 1, except where otherwise specified, and the configuration substantially the same as the configuration of embodiment 1 will be assigned the same symbols and / or names as used in embodiment 1 as necessary, and the description thereof will be omitted.

[0081] (Configuration - Construction target area) First, the configuration of the construction target area 100 according to the second embodiment will be described.

[0082] The construction target area 100 according to the second embodiment is configured substantially the same as the construction target area 1 according to the first embodiment.

[0083] (Composition - pile body) Next, the configuration of the pile body 130 will be described.

[0084] The pile body 130 according to the second embodiment is configured substantially the same as the pile body 30 according to the first embodiment. Moreover, the pile hole 131 into which the pile body 130 is inserted is configured substantially the same as the pile hole 31 according to the first embodiment.

[0085] (configuration-inhibitor) Next, the configuration of the suppressor 140 will be described.

[0086] This suppressor 140 is constructed, for example, using a long steel material (for example, a round steel material having a hardness higher than that of the second ground 20), and is buried in either the first ground 10 or the second ground 20 at a distance from the other of the first ground 10 or the second ground 20. Specifically, as shown in Figure 4, multiple suppressor bodies 140 (three suppressor bodies 140 in Figure 4(b)) are buried at intervals G1 (hereinafter referred to as "first interval G1") between each other so that the longitudinal direction of the suppressor body 140 is approximately along the vertical direction, and the suppressor body 140 is buried in the first ground 10 at an interval G2 (hereinafter referred to as "second interval G2") between the second ground 20.

[0087] The lengths of the first interval G1 and the second interval G2 are set to lengths that can suppress bending of the pile body 130 by multiple restraining bodies 140, and may be set, for example, based on calculation results or experimental results (as an example, they may be set to approximately 0.5 m to 2 m).

[0088] Furthermore, the specific shapes and sizes of the multiple suppressing bodies 140 are arbitrary, but in the first embodiment they are set as follows.

[0089] That is, the planar shape of each of the multiple suppressing bodies 140 is set to be approximately circular, as shown in Fig. 4(b). However, this is not limiting, and each may be set to, for example, a polygonal shape (e.g., a triangular shape, a rectangular shape, etc.), an elliptical shape, or an approximately H-shape. Alternatively, each may be set to a different shape.

[0090] In addition, the diameter size (planar size) of each of the multiple restraining bodies 140 is set to be shorter than the vertical length of the second ground 20, which is shorter than the vertical length of the first ground 10, and specifically, each is set to a size based on the diameter of the auger part of the pile driving device and / or the number of restraining bodies 140.

[0091] For example, as shown in Figure 4(b), since the diameter of the auger part of the pile driving device is approximately half the diameter of the second ground 20 and the number of restraining bodies 140 is three, it may be set to approximately half the diameter of the pile hole 131.

[0092] This allows the diameter of the restraining body 140 to be set appropriately, and bending of the pile body 130 can be effectively suppressed.

[0093] 4(a), the vertical length of the suppressor 140 is set shorter than the vertical length of the second ground 20, which is shorter than the vertical length of the first ground 10. More specifically, it is set based on the vertical length of the auger part of the pile driver and the overlap area between the second ground 20 and the auger part of the pile driver, and may be set to, for example, about 5 m to 15 m.

[0094] (Pile construction method) Next, a construction method for the pile body 130 according to the second embodiment will be described.

[0095] As shown in FIGS. 4 to 7, the construction method for the pile 130 includes an embedding step, an installation step, and a removal step.

[0096] (Pile construction method - Burial process) First, the embedding step will be described.

[0097] Specifically, in the embedding step, first, a plurality of boreholes 141 are formed in the first ground 10 using a known drilling device (not shown). More specifically, as shown in Fig. 5, three boreholes 141 are formed in the first ground 10 at a first interval G1 between them, and one is formed in the first ground 10 at a second interval G2 between it and the second ground 20. Next, a restraining body 140 (specifically, a round steel material) is inserted into each of the plurality of boreholes 141 using a known hanging device (not shown).

[0098] Through the above series of operations, one suppressor 140 having a substantially circular planar shape is buried in the first ground 10 so that the longitudinal direction of the suppressor 140 is substantially aligned with the vertical direction, as shown in FIG. 5.

[0099] As described above, the diameter (planar size) of the suppressor 140 is set based on the diameter of the auger part of the pile driving device and the number of suppressor bodies 140. As described above, the vertical length of the suppressor body 140 is set shorter than the vertical length of the second ground 20, which is shorter than the vertical length of the first ground 10.

[0100] (Pile construction method - installation process) Next, the installation process will be described.

[0101] Specifically, in the installation process, a pile driving device is installed in the construction target area 100. Next, a pile hole 131 is formed by the auger part of the pile driving device so as to cross the first ground 10 and the second ground 20. More specifically, the pile hole 131 is formed at a position where it does not overlap with the plurality of restraining bodies 140, and more specifically, as shown in FIG. 6, the pile hole 131 is formed at a position where a part of the pile hole 131 overlaps the second ground 20 and a distance G3 (hereinafter referred to as "third distance G3") in FIG. 4 is generated between the pile hole 131 and the plurality of restraining bodies 140. Next, a pile body 130 is inserted into the pile hole 131 by the crane part of the pile driving device.

[0102] By this series of operations, the pile body 130 is installed at a position where bending of the pile body 130 can be suppressed (specifically, at a position where it does not overlap with a plurality of suppressing bodies 140), as shown in Fig. 4. Therefore, when the pile hole 131 is formed, the auger part of the pile driving device is sandwiched between the suppressing bodies 140 and the second ground 20, which have a relatively high hardness, and the movement of the auger part can be guided substantially along the vertical direction, thereby preventing the pile hole 131 from bending. Therefore, it is possible to effectively suppress bending of the pile body 130.

[0103] (Pile construction method - removal process) Next, the removal process will be described.

[0104] The removal step is a step of removing the suppressor 140 after the installation step.

[0105] Specifically, first, a lifting device is used to lift up the inhibitors 140 inserted into each of the plurality of boreholes 141, and the inhibitors 140 are removed from each of the boreholes 141. Then, using a known transport means (e.g., a truck, etc.) not shown, the removed inhibitors 140 are transported to a predetermined removal position (e.g., a building material storage area, etc., located a predetermined distance away from the construction target area 100).

[0106] In this case, for example, as shown in Figure 7, each borehole 141 may be backfilled with soil 142 generated during the formation of the borehole 141, thereby ensuring workability in the construction area 100 after the pile body 130 is constructed.

[0107] By carrying out the above series of operations, the multiple suppressing bodies 140 can be removed from the first ground 10, and the surrounding environment of the first ground 10 can be prevented from being disturbed by the suppressing bodies 140.

[0108] According to the construction method of the pile body 130 as described above, when the pile body 130 is installed using a pile driving device, the restraining body 140 makes it easier to form the pile hole 131 so that it is substantially aligned in the vertical direction, thereby preventing bending of the pile body 130. Therefore, it is possible to improve the workability of the pile body 130, substantially similar to the construction method of the pile body 30 according to the first embodiment.

[0109] (Effects of the second embodiment) Thus, according to the second embodiment, in the embedding step, the suppressor 140 having a hardness equal to or greater than that of the second ground 20 is embedded in the first ground 10 at a distance from the second ground 20, and in the installation step, the pile body 130 is installed at a position that does not overlap with the suppressor 140. Therefore, when the pile hole 131 is formed, the auger part of the pile driving device is sandwiched between the suppressor 140 having a relatively high hardness and the second ground 20, and the movement of the auger part can be guided substantially along the vertical direction, thereby preventing the pile hole 131 from bending. Therefore, it is possible to more effectively suppress bending of the pile body 130.

[0110] Furthermore, since the installation process includes a removal process for removing the inhibitor 140, the inhibitor 140 can be removed from the first ground 10, and the inhibitor 140 can be prevented from disturbing the surrounding environment of the first ground 10.

[0111] [III] Modifications to the embodiment Although the embodiments of the present invention have been described above, the specific configurations and means of the present invention can be modified and improved as desired within the scope of the technical ideas of the inventions set forth in the claims. Such modifications will be described below.

[0112] (About the problem to be solved and the effects of the invention) First, the problems that the invention aims to solve and the effects of the invention are not limited to those described above, and the present invention may solve problems that are not described above or achieve effects that are not described above, or may solve only some of the problems that are described or achieve only some of the effects that are described.

[0113] (shape, numbers, structure, time series) The components illustrated in the embodiments and drawings may be modified and improved as desired within the scope of the technical concept of the present invention in terms of shape, numerical value, or the structure or chronological relationship of multiple components.

[0114] (Regarding the construction area) In the first and second embodiments, the hardness of the second ground 20 is described as being higher than the hardness of the first ground 10, but this is not limiting, and the second ground 20 may, for example, be lower than the hardness of the first ground 10. In the second embodiment, if the hardness of the second ground 20 is lower than the hardness of the first ground 10, a suppressor 140 having a hardness equal to or greater than the hardness of the first ground 10 may be buried in the second ground 20 at a distance from the first ground 10.

[0115] Furthermore, in embodiments 1 and 2, the second ground 20 is described as being composed of a ground improvement body, but this is not limited to this and may be composed of, for example, soil from the ground of an area other than the construction target area 1.

[0116] (About the Inhibitor) In the first and second embodiments, the planar size of the restraining body is set based on the overlapping area between the pile body and the second ground 20, the diameter of the auger part of the pile driving device, and the number of restraining bodies. However, this is not limiting. For example, the planar size may be set based on only one of the overlapping area between the pile body and the second ground 20, the diameter of the auger part of the pile driving device, or the size based on the number of restraining bodies.

[0117] In addition, in the first and second embodiments, the vertical length of the suppressing body is set to be shorter than the vertical length of the second ground 20, but this is not limited to this. For example, the vertical length may be set to be the same as the vertical length of the second ground 20, or may be set to be longer than the vertical length of the second ground 20.

[0118] In addition, in the first embodiment, the hardness of the suppressor 40 is described as being higher than the hardness of the first ground 10 and lower than the hardness of the second ground 20, but this is not limited to this. For example, the hardness may be lower than the hardness of the first ground 10, or may be higher than the hardness of the second ground 20.

[0119] Furthermore, in the second embodiment, the number of installed suppressors 140 is described as three, but the number is not limited to this, and may be, for example, less than two, or may be four or more.

[0120] In addition, in the second embodiment, it has been described that the multiple suppressing bodies 140 are buried at first intervals G1 from one another and at second intervals G2 from the second ground 20 in the first ground 10, but this is not limiting. For example, the first interval G1 may be omitted, and adjacent suppressing bodies 140 may be arranged to be in contact with one another. Alternatively, the second interval G2 may be omitted, and the pile body 130 and the multiple suppressing bodies 140 may be arranged to be in contact with one another.

[0121] (About the construction method) In the first embodiment, the suppressor 40 is formed on-site in the embedding step, and then embedded, but this is not limiting. For example, after the borehole 41 is formed, the suppressor 40 formed in a factory may be inserted into the borehole 41 using a lifting device, thereby embedding the suppressor 40.

[0122] Furthermore, in the first embodiment, it has been described that the suppressor 40 is left buried without being removed from the borehole 41 after the installation step, but this is not limited to this. For example, the suppressor 40 may be removed by performing a removal step (for example, by using a known chipping device to chip off a portion of the suppressor 40 and repeatedly removing the chipped portion from the borehole 41) after the installation step. This allows the suppressor 40 to be removed from the first ground 10 and the second ground 20, and prevents the suppressor 40 from disturbing the surrounding environments of the first ground 10 and the second ground 20.

[0123] In addition, in the second embodiment, the removal step is performed after the installation step, but this is not limiting. For example, after the installation step, the plurality of suppressing bodies 140 may be buried without being removed from each of the boreholes 141.

[0124] (Addendum) The pile construction method of Appendix 1 is a construction method for constructing a pile so that the pile crosses a first ground and a second ground having a hardness different from that of the first ground, and includes an embedding step of embedding a restraining body that suppresses bending of the pile into the first ground and / or the second ground, and an installation step of using a pile driving means to install the pile at a position where bending of the pile can be suppressed by the restraining body after the embedding step.

[0125] The pile construction method of Appendix 2 is the pile construction method described in Appendix 1, in which the planar size of the restraining body is set based on the overlap area between the pile body and the second ground, the diameter of the auger part of the pile driving means, and / or the number of restraining bodies.

[0126] The pile construction method of Appendix 3 is the pile construction method described in Appendix 1 or 2, in which the vertical length of the restraining body is set to be equal to or less than the shorter of either the vertical length of the first ground or the vertical length of the second ground.

[0127] The pile construction method of Appendix 4 is a pile construction method described in any one of Appendixes 1 to 3, in which, in the embedding step, the restraining body having a uniform hardness is embedded across the first ground and the second ground, and in the installation step, the pile body is installed within the restraining body.

[0128] The pile construction method of Appendix 5 is a pile construction method described in any one of Appendixes 1 to 3, in which, in the burying step, the restraining body having a hardness equal to or greater than the hardness of either the first ground or the second ground is buried in either the first ground or the second ground at a distance from either the first ground or the second ground, and in the installation step, the pile body is installed in a position that does not overlap with the restraining body.

[0129] The pile construction method of Supplementary Note 6 is the pile construction method of any one of Supplementary Notes 1 to 5, wherein the restraining body is made of steel, wood, or hardened cement.

[0130] The pile construction method of Supplementary Note 7 is the pile construction method of any one of Supplementary Notes 1 to 6, which includes a removal step of removing the restraining body after the installation step.

[0131] (Effect of supplementary notes) The pile construction method described in Appendix 1 includes an embedding step of embedding the restraining body in the first ground and / or the second ground, and an installation step of installing the pile using pile driving means at a position where the restraining body can prevent the pile from bending, so that when the pile is installed using the pile driving means, the restraining body can easily form a pile hole that is substantially aligned in the vertical direction, thereby preventing the pile from bending. This makes it possible to improve the workability of the pile.

[0132] According to the pile construction method described in Appendix 2, the planar size of the restraining body is determined based on the overlapping area between the pile body and the second ground, the diameter of the auger part of the pile driving means, and / or the number of restraining bodies, so that the planar size of the restraining body can be appropriately set and bending of the pile body can be effectively suppressed.

[0133] According to the construction method of the pile body described in Appendix 3, the vertical length of the restraining body is set to be equal to or less than the shorter of either the vertical length of the first ground or the vertical length of the second ground, so that the vertical length of the restraining body can be appropriately set, and bending of the pile body can be more effectively suppressed.

[0134] According to the pile construction method described in Appendix 4, in the embedding step, a suppressor having a uniform hardness is embedded in both the first and second ground, and in the installation step, the pile is installed in the suppressor, so that when the pile hole is formed, the suppressor has a uniform hardness, which makes it difficult for the magnitude of the horizontal resistance of the suppressor acting on the auger part of the pile driving means to differ, and therefore, the occurrence of bending of the pile hole can be avoided. Therefore, it becomes possible to more effectively suppress bending of the pile.

[0135] According to the pile construction method described in Appendix 5, in the embedding step, a restraining body having a hardness equal to or greater than that of either the first or second ground is embedded in either the first or second ground at a distance from the other of the first or second ground, and in the installation step, the pile is installed in a position that does not overlap with the restraining body. For example, when a pile hole is formed, the auger part of the pile driving means is sandwiched between the restraining body having a relatively high hardness and the first or second ground, and the movement of the auger part can be guided substantially along the vertical direction, thereby preventing the pile hole from bending. This makes it possible to more effectively suppress bending of the pile body.

[0136] According to the pile construction method described in Appendix 6, the restraining body is made of steel, wood, or hardened cement, so that the restraining body can be constructed easily and inexpensively, and the manufacturability of the restraining body can be improved.

[0137] According to the pile construction method described in Appendix 7, a removal process for removing the restraining body is included after the installation process, so that the restraining body can be removed from the first ground and / or the second ground, and it is possible to avoid the restraining body from disturbing the surrounding environment of the first ground and / or the second ground. [Explanation of symbols]

[0138] 1. Construction area 10 First Ground 20 Second Ground 30 Pile body 31 Pilehole 40 Inhibitor 41 Borehole 100 Construction area 130 Pile body 131 Pilehole 140 Inhibitor 141 Borehole 142 Sat G1 First interval G2 2nd interval G3 3rd interval

Claims

1. A construction method for constructing a pile body so that the pile body crosses a first ground and a second ground having a hardness different from that of the first ground, An embedding step of embedding a suppression body that suppresses bending of the pile body in the first ground and the second ground; and an installation step of installing the pile body using a pile driving means after the embedding step, the suppressor is a long body made of wood or hardened cement, In the embedding step, the suppressor having a uniform hardness is embedded across the first ground and the second ground, In the installation step, the bending of the pile body can be suppressed by installing the pile body within the suppression body. Pile construction method.

2. A construction method for constructing a pile body so that the pile body crosses a first ground and a second ground having a hardness different from that of the first ground, comprising: An embedding step of embedding a suppression body that suppresses bending of the pile body in the first ground and / or the second ground; and an installation step of installing the pile body using a pile driving means after the embedding step, the suppressor is a long body made of steel, wood, or hardened cement, In the embedding step, a plurality of the suppressing bodies having a hardness equal to or greater than the hardness of the second ground are embedded in the first ground spaced apart from the second ground and having a hardness lower than that of the second ground, In the installation step, the pile body is installed at a position that does not overlap with the plurality of restraining bodies and is surrounded by the second ground and the plurality of restraining bodies, thereby making it possible to prevent the pile body from bending toward the first ground. Pile construction method.

3. The size of the planar surface of the restraining body is based on the overlapping area between the pile body and the second ground, the diameter of the auger part of the pile driving means, or / and the number of the restraining bodies. A method for constructing a pile body according to claim 1 or 2.

4. The vertical length of the restraining body is set to be equal to or less than the shorter of either the vertical length of the first ground or the vertical length of the second ground. A method for constructing a pile body according to any one of claims 1 to 3.

5. After the installation step, a removal step of removing the suppressor is included. A method for constructing a pile body according to any one of claims 1 to 4.

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