Pile head treatment structure and pile head treatment method

Abstract

To provide a pile head treatment method capable of accurately carrying out pile head treatment at a low cost with light load for work preparation.SOLUTION: A pile head treatment structure (1) is structured to remove extra-filled concrete (6) from a concrete pile (5). The pile head treatment structure is provided with a cylindrical reinforcement cage (11) installed in a pile hole (9) of the concrete pile and edge cutting members (31, 41) forming edge cutting faces (32, 42) at a specific height of the reinforcement cage. The edge cutting members are formed to cover the reinforcement cage except an opening for making concrete pass therethrough, to be allowed to be lifted from the reinforcement cage.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pile head treatment structure and a pile head treatment method. [Background technology]

[0002] Cast-in-place concrete piles are formed by pouring concrete into a vertical hole in which a reinforcing bar cage is installed. Impurities such as soil and sand may be mixed into the head of a concrete pile, reducing its strength. Therefore, after the concrete pile is formed higher than a predetermined height, the excess concrete at the head of the pile is removed at the predetermined height through pile head treatment. Pile head treatment using a hand breaker or similar tool can cause noise, vibration, dust, and other factors that can lead to a poor working environment. For this reason, methods have been proposed for pile head treatment that utilize the expansion of static crushing materials or the expansion of water when it freezes to break and remove the excess concrete horizontally (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-095254 [Patent Document 2] Japanese Patent Application Publication No. 2016-204827 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the pile head treatment methods described in Patent Documents 1 and 2 require static crushing materials, which increases costs and requires a large amount of preparation work. In addition, there is a risk of damage to the concrete pile body if the static crushing materials are not installed in the correct position.

[0005] The present invention has been made in consideration of these points, and aims to provide a pile head treatment structure and pile head treatment method that are inexpensive, require little work preparation, and can perform pile head treatment with high accuracy. [Means for solving the problem]

[0006] One embodiment of the pile head treatment structure of the present invention is a pile head treatment structure for removing excess concrete from a concrete pile, and comprises a cylindrical reinforcing bar cage installed in a pile hole of the concrete pile, and an edge cutting material that forms an edge cutting surface at a predetermined height of the reinforcing bar cage, the edge cutting material covering the reinforcing bar cage except for an opening through which concrete passes, and the edge cutting material being formed so that it can be lifted from the reinforcing bar cage. [Effects of the Invention]

[0007] In one embodiment of the pile head treatment structure of the present invention, when concrete is poured into a pile hole, impurities within the pile hole are lifted by the high-quality concrete. Concrete is poured through the opening in the edge-cutting material to a position higher than a predetermined height, forming excess concrete containing impurities at the head of the concrete pile. When the edge-cutting material is lifted from the rebar cage after the concrete pile has hardened, cracks form in the concrete pile along the edge-cutting surface, removing the excess concrete from the concrete pile. Because hand breakers and other tools are not required, the working environment is not degraded by noise, vibration, dust, etc., and because static crushing materials and other tools are not required, costs and the burden of work preparation can be reduced. Furthermore, because edge-cutting can be performed more accurately than with static crushing materials, damage to the concrete pile body is less likely to occur. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a side view of the pile head treatment structure of this embodiment. [Figure 2] FIG. 10 is a top view of the setup reinforcement of the present embodiment. [Figure 3] FIG. 2 is a top view of the upper edge cutting material of this embodiment. [Figure 4] FIG. 2 is a top view of the lower edge cutting material of this embodiment. [Figure 5] FIG. 10 is an explanatory diagram of the pile head treatment according to the present embodiment. [Figure 6] FIG. 10 is an explanatory diagram of a modified example of pile head treatment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The pile head treatment structure of this embodiment will be described below. Figure 1 is a side view of the pile head treatment structure of this embodiment. Figure 2 is a top view of the preparation reinforcement of this embodiment. Figure 3 is a top view of the upper edge cutting material of this embodiment. Figure 4 is a top view of the lower edge cutting material of this embodiment.

[0010] As shown in Figure 1, the pile head treatment structure 1 is a structure for removing excess concrete 6 from a concrete pile 5. The pile head treatment structure 1 is formed by horizontally dividing a cylindrical reinforcing bar cage 11, which is installed in the pile hole of the concrete pile 5 before concrete is poured, with an upper edge cutter 31 and a lower edge cutter 41. The reinforcing bar cage 11 is formed into a cylindrical shape by joining a plurality of main pile reinforcements 12 arranged in a ring shape along the inner periphery of the pile hole and a plurality of hoop reinforcements 13 arranged in the height direction of the pile hole. The plurality of main pile reinforcements 12 protrude above the lower edge cutter 41, but the plurality of hoop reinforcements 13 are not arranged in the height direction above the lower edge cutter 41.

[0011] As shown in Figures 1 and 2, a settling bar 21 is fixed to the upper end of the reinforcing bar cage 11, reinforcing the reinforcing bar cage 11 with the settling bar 21. The settling bar 21 includes an upper end bar 22 connected to a plurality of pile main reinforcements 12, four horizontal reinforcing bars 23 that cross the upper end bar 22, and four vertical reinforcing bars 24 that run vertically through the upper end bar 22. The four horizontal reinforcing bars 23 are installed symmetrically on the inside and outside with respect to the horizontal center line L1, and the four vertical reinforcing bars 24 are installed symmetrically on the inside and outside with respect to the vertical center line L2. An inner lifting bar 25 is connected to the intersection of the inner horizontal reinforcing bar 23 and the vertical reinforcing bar 24, and an outer lifting bar 26 is connected to the intersection of the outer horizontal reinforcing bar 23 and the vertical reinforcing bar 24.

[0012] As shown in Figures 1 and 3, an upper edge cutter 31 is supported on the step reinforcement 21 via an inner lifting rebar 25. The upper edge cutter 31 forms an upper edge cut surface 32 at the upper height of the reinforcing bar cage 11. The upper edge cutter 31 includes an upper reinforcing bar lattice 33 in which reinforcing bars are arranged in a lattice pattern, and a plurality of upper closure plates 34 that close openings in the upper reinforcing bar lattice 33. A plurality of upper horizontal reinforcing bars 36 of the upper reinforcing bar lattice 33 are installed symmetrically with respect to the horizontal center line L1, and a plurality of upper vertical reinforcing bars 37 of the upper reinforcing bar lattice 33 are installed symmetrically with respect to the vertical center line L2. Openings of various sizes are formed by the plurality of upper horizontal reinforcing bars 36 and the plurality of upper vertical reinforcing bars 37.

[0013] In plan view, 50% or more of the reinforcing bar cage 11 is covered by the upper edge cutting material 31 (plurality of upper closure plates 34), so that a horizontal crack surface is formed in the concrete pile 5. In this case, the plurality of upper closure plates 34 are installed in a staggered pattern except for the central portion of the upper reinforcing bar lattice 33, and the plurality of upper closure plates 34 are uniformly distributed relative to the upper reinforcing bar lattice 33. By uniformly interposing the plurality of upper closure plates 34 in the concrete pile 5, the concrete pile 5 is more likely to fracture along the upper edge cutting surface 32. In this way, the upper edge cutting surface 32 is formed with a simple configuration of the upper reinforcing bar lattice 33 and the plurality of upper closure plates 34.

[0014] A cross-shaped upper opening 35 is formed in the center of the upper edge cutter 31. When pouring concrete, impurities such as soil and sand are lifted by the high-quality concrete, but the impurities can pass through the upper opening 35 more easily, making it less likely for the impurities to become entrained in the high-quality concrete, thereby improving the quality of the pile body 7 of the concrete pile 5. In addition, through holes are formed in the four upper closure plates 34 around the upper opening 35, and four outer lifting rebars 26 extend downward through the through holes in the four upper closure plates 34. By passing the outer lifting rebars 26 through the through holes in the upper closure plates 34, interference between the outer lifting rebars 26 and the upper closure plates 34 is reduced.

[0015] As shown in Figures 1 and 4, a lower edge severing member 41 is supported on the step reinforcement 21 via the outer lifting rebar 26. The lower edge severing member 41 forms a lower edge severing surface 42 at the lower height of the reinforcing bar cage 11. The lower edge severing member 41 includes a lower reinforcing bar lattice 43 in which reinforcing bars are arranged in a lattice pattern, and a plurality of lower closure plates 44 that close the openings of the lower reinforcing bar lattice 43. A plurality of lower horizontal reinforcing bars 46 of the lower reinforcing bar lattice 43 are installed symmetrically with respect to the horizontal center line L1, and a plurality of lower vertical reinforcing bars 47 of the lower reinforcing bar lattice 43 are installed symmetrically with respect to the vertical center line L2. In this way, the lower edge severing member 41, like the upper edge severing member 31, is formed with a simple structure.

[0016] In the lower edge cutting material 41, more than 50% of the reinforcing bar cage 11 is covered by the lower edge cutting material 41 (plurality of lower closure plates 44) in a plan view, so that a horizontal crack surface is formed in the concrete pile 5. The plural lower closure plates 44 are installed in a staggered pattern except for the central portion of the lower reinforcing bar grid 43, making it easier for the concrete pile 5 to fracture along the lower edge cutting surface 42. A cross-shaped lower opening 45 is formed in the center of the upper edge cutting material 31, so that impurities pushed up into the high-quality concrete can easily pass through the lower opening 45, improving the quality of the pile body 7 of the concrete pile 5.

[0017] As shown in Figures 3 and 4, the upper edge severing material 31 covers a wider area of ​​the reinforcing bar cage 11 than the lower edge severing material 41. As mentioned above, impurities are pushed up into the high-quality concrete when the concrete is poured, so the impurities in the concrete increase in number the higher it is. For this reason, the upper edge severing material 31 prioritizes the edge severing effect by increasing the area that blocks the concrete rather than allowing impurities to escape upward through the opening. Conversely, the lower edge severing material 41 improves the quality of the pile body 7 by allowing impurities to escape upward through the opening rather than enhancing the edge severing effect.

[0018] In this way, except for the opening through which the concrete passes, the reinforcing bar cage 11 is partitioned by the upper edge cutting member 31 and the lower edge cutting member 41, forming the upper edge cutting surface 32 and the lower edge cutting surface 42. After the concrete has hardened, the inner lifting reinforcing bar 25 and the outer lifting reinforcing bar 26 are cut from the preparation reinforcement 21, and the inner lifting reinforcing bar 25 and the outer lifting reinforcing bar 26 are pulled up by heavy machinery, thereby breaking the concrete pile 5 at the upper edge cutting surface 32 and the lower edge cutting surface 42 and removing the excess concrete 6 in two steps. Even heavy machinery with a small rated load can remove the excess concrete 6 in small pieces.

[0019] As shown in FIG. 1, multiple pile main reinforcements 12 of a reinforcing bar cage 11 protrude upward from the lower edge cutter 41, and the protruding portions of these multiple pile main reinforcements 12 are covered with an edge cutter cover 51. Four outer lifting reinforcing bars 26 protrude upward from the upper edge cutter 31, and these four outer lifting reinforcing bars 26 are partially covered with an edge cutter cover 52. The edge cutter covers 51, 52 have a double structure consisting of an inner curing cover and an outer rigid pipe. The edge cutter cover 51 separates the reinforcing bars from the concrete, allowing for easy removal of excess concrete 6 and preventing damage to the reinforcing bars. The rigid pipe may be made of polyvinyl chloride resin or iron.

[0020] The pile head treatment method will be described with reference to Fig. 5. Fig. 5 is an explanatory diagram of the pile head treatment of this embodiment.

[0021] As shown in FIG. 5(A), a cylindrical reinforcing bar cage 11 is installed in a pile hole 9 of a concrete pile, and a preparation reinforcing bar 21 is joined to the upper ends of the multiple main pile reinforcements 12 of the reinforcing bar cage 11. A lower edge cutting member 41 is joined to the preparation reinforcing bar 21 via four outer lifting reinforcing bars 26, and the lower edge cutting member 41 is supported at the lower height of the reinforcing bar cage 11 to form a lower edge cutting surface 42. In addition, an upper edge cutting member 31 is joined to the preparation reinforcing bar 21 via four inner lifting reinforcing bars 25, and the upper edge cutting member 31 is supported at the upper height of the reinforcing bar cage 11 to form an upper edge cutting surface 32. The upper edge cutting member 31 and the lower edge cutting member 41 may be prepared before or immediately after pouring the concrete.

[0022] Next, as shown in Figure 5(B), concrete is poured into the pile hole 9 to form the concrete pile 5. In this case, concrete is poured through the openings of the lower edge cutter 41 and the upper edge cutter 31 to a position higher than the upper edge cutter 31. By lifting the concrete containing impurities upward through the openings of the lower edge cutter 41 and the upper edge cutter 31, impurities are less likely to become entrained in the concrete below the lower edge cutter 41. In this way, the pile body 7 is formed of high-quality concrete below the lower edge cutter 41, and excess concrete 6a, 6b containing impurities is formed above the lower edge cutter 41.

[0023] Next, as shown in Figure 5(C), heavy machinery (not shown) lifts the upper edge cutting material 31, and the upper excess concrete 6a is removed. In this case, the preparation reinforcement 21 is cut from the multiple pile main reinforcements 12, four inner lifting reinforcements 25, and four outer lifting reinforcements 26 of the reinforcing bar cage 11. The four inner lifting reinforcements 25 are pulled up by heavy machinery, and the upper edge cutting material 31 is lifted from the reinforcing bar cage 11, causing cracks along the upper edge cutting surface 32 in the concrete pile 5. By repeatedly raising and lowering the lower edge cutting material 41 and lifting it, a lifting force is intermittently applied to the upper edge cutting surface 32 of the concrete pile 5, making it easier to fracture along the upper edge cutting surface 32.

[0024] Next, as shown in Figure 5(D), heavy machinery is used to lift the lower edge cutter 41 and remove the lower excess concrete 6b. In this case, the four outer lifting rebars 26 are pulled up by heavy machinery, and the lower edge cutter 41 is lifted from the rebar cage 11, causing cracks to form in the concrete pile 5 along the lower edge cut surface 42. By repeatedly raising and lowering the lower edge cutter 41 while lifting it, a lifting force is intermittently applied to the lower edge cut surface 42 of the concrete pile 5, making it easier to fracture along the lower edge cut surface 42. The excess concrete 6b is removed from the concrete pile 5, leaving behind the pile body 7 made of high-quality concrete.

[0025] As described above, according to the pile head treatment structure 1 of this embodiment, when the upper edge cutting material 31 and the lower edge cutting material 41 are lifted from the reinforcing bar cage 11 after the concrete pile 5 has hardened, cracks are formed in the concrete pile 5 along the upper edge cutting surface 32 and the lower edge cutting surface 42, and the excess concrete 6 is removed from the concrete pile 5. Because a hand breaker or the like is not required, the working environment is not deteriorated by noise, vibration, dust, etc., and because static crushing materials are not required, costs can be reduced and the burden of work preparation can be alleviated. Furthermore, because edge cutting can be performed more accurately than with static crushing materials, damage to the pile body 7 of the concrete pile 5 is less likely to occur.

[0026] In this embodiment, the edge severing material is configured to be able to be lifted from the reinforcing bar cage by the lifting reinforcing bar, but the lifting method is not particularly limited as long as the edge severing material is configured to be able to be lifted from the reinforcing bar cage. For example, as shown in Figures 6(A) and 6(B), lifting jigs 53a and 53b may be set directly on the top surface of the excess concrete 6a and 6b to lift the upper edge severing material 31 and the lower edge severing material 41. As shown in Figures 6(C) and 6(D), lifting jigs 53a and 53b may be set on the upper edge severing material 31 and the lower edge severing material 41 to lift them. Lifting jigs 53a and 53b may also be set directly on the side surfaces of the excess concrete 6a and 6b.

[0027] Furthermore, the edge protection material may be lifted from the rebar cage by combining at least two of the lifting rebar, the lifting jig on the top surface of the concrete, and the lifting jig on the side of the concrete. In this case, the lifting force acting on the edge protection surface increases, making it easier for the excess concrete to break from the concrete pile.

[0028] In addition, in this embodiment, two edge cutting surfaces are formed at different heights of the reinforcing bar cage by two upper and lower edge cutting materials, but one edge cutting surface may be formed at a specified height of the reinforcing bar cage by a single edge cutting material, or three or more edge cutting surfaces may be formed at different heights of the reinforcing bar cage by three or more edge cutting materials.

[0029] Furthermore, in this embodiment, openings are formed in a staggered pattern in the edge insulating material, but it is sufficient that openings are formed in at least the central portion of the edge insulating material.

[0030] In addition, in this embodiment, the reinforcing bar cage is formed by the pile main reinforcement and the hoop reinforcement, but the structure of the reinforcing bar cage is not particularly limited as long as it is installed in the pile hole of the concrete pile and is formed in a cylindrical shape.

[0031] In addition, in this embodiment, the edge separation material is formed by the reinforcing bar grid and the blocking plate, but the structure of the edge separation material is not particularly limited as long as it is possible to form an edge separation surface at a predetermined height of the reinforcing bar cage.

[0032] In addition, in this embodiment, the edge cutting material is lifted by repeatedly raising and lowering the edge cutting material, but the edge cutting material may also be lifted all at once at a low speed.

[0033] Furthermore, the pile head treatment of this embodiment can also be applied to pile head treatment in the semi-rigid pile head joint construction method.

[0034] As described above, the first embodiment is a pile head treatment structure (1) for removing excess concrete (6) from a concrete pile (5). The structure includes a cylindrical reinforcing bar cage (11) installed in the pile hole (9) of the concrete pile and edge severance members (upper edge severance member 31, lower edge severance member 41) that form edge severance surfaces (upper edge severance surface 32, lower edge severance surface 42) at a predetermined height of the reinforcing bar cage. The edge severance members cover the reinforcing bar cage except for an opening through which concrete passes, and are configured so that the edge severance members can be lifted from the reinforcing bar cage. With this configuration, when concrete is poured into the pile hole, impurities in the pile hole are lifted by the high-quality concrete. Concrete is poured through the opening in the edge severance member to a position higher than the predetermined height, forming excess concrete containing impurities at the pile head of the concrete pile. When the edge severance member is lifted from the reinforcing bar cage after the concrete pile hardens, cracks form in the concrete pile along the edge severance surfaces, and the excess concrete is removed from the concrete pile. Since hand breakers and the like are not required, the working environment is not deteriorated by noise, vibration, dust, etc., and since static crushing materials and the like are not required, costs can be reduced and the burden of work preparation can be alleviated. Furthermore, since the edges can be cut more precisely than with static crushing materials, it is less likely to damage the concrete pile body.

[0035] In the second embodiment, the edge insulating material is formed with openings (upper opening 35, lower opening 45) at least in the center portion of the edge insulating material in the first embodiment. This configuration allows impurities in the concrete to easily pass through the openings in the edge insulating material, improving the quality of the pile body of the concrete pile.

[0036] In a third aspect, in the first or second aspect, the edge insulating material covers 50% or more of the reinforcing bar cage in a plan view. According to this configuration, the edge insulating material forms horizontal crack surfaces in the concrete pile.

[0037] The fourth aspect is any one of the first to third aspects, in which the edge severing materials are multiple edge severing materials that form edge severing surfaces at multiple heights of the rebar cage, with the upper edge severing materials covering a wider area of ​​the rebar cage than the lower edge severing materials.With this configuration, even heavy machinery with a low rated load can remove excess concrete in small pieces.The upper edge severing materials prioritize the edge severing effect by increasing the area that blocks the concrete rather than allowing impurities to escape upward through openings when pouring concrete.Conversely, the lower edge severing materials prioritize the quality of the pile body by allowing impurities to escape upward through openings rather than enhancing the edge severing effect.

[0038] The fifth aspect is any one of the first to fourth aspects, and is provided with a reinforcing stepping bar (21) fixed to the upper end of the reinforcing bar cage, and the edge-cutting material is supported on the stepping bar via lifting bars (inner lifting bar 25, outer lifting bar 26), and the lifting bars are cut from the stepping bars so that the edge-cutting material can be lifted from the reinforcing bar cage by the lifting bars. With this configuration, excess concrete can be removed from the concrete pile by pulling up the lifting bars with heavy machinery.

[0039] In the sixth embodiment, in any one of the first to fifth embodiments, the pile main reinforcement bars (12) of the reinforcing cage protrude above the edge insulation material, and the protruding parts of the pile main reinforcement bars are covered with an edge insulation cover (51). With this configuration, the pile main reinforcement bars and the excess concrete can be separated, and the excess concrete can be easily removed.

[0040] In the seventh aspect, in any one of the first to sixth aspects, the edge separation material has a rebar lattice (upper rebar lattice 33, lower rebar lattice 43) in which rebars are arranged in a lattice pattern, and a plurality of closing plates (upper closing plates 34, lower closing plates 44) that close the openings of the rebar lattice. With this configuration, the edge separation surface can be formed with a simple configuration.

[0041] In the eighth aspect, in the seventh aspect, the multiple closure plates are installed in a staggered pattern except for the center part of the rebar lattice. With this configuration, the multiple closure plates can be uniformly distributed relative to the rebar lattice, making it easier to break the concrete pile along the edge cutting surface.

[0042] A ninth aspect is a pile head treatment method for removing excess concrete from a concrete pile, comprising the steps of: placing a cylindrical reinforcing bar cage in a pile hole of the concrete pile; supporting a severing material at a predetermined height of the reinforcing bar cage to form a severing surface; pouring concrete into the pile hole to form a concrete pile; and lifting the severing material to remove the excess concrete. In the concrete pile forming step, the severing material covers the reinforcing bar cage except for an opening through which the concrete passes; and in the excess concrete removing step, the severing material is lifted from the reinforcing bar cage to create a crack along the severing surface in the concrete pile. With this configuration, when concrete is poured into the pile hole, impurities in the pile hole are lifted by the high-quality concrete. Concrete is poured through the opening in the severing material to a position higher than the predetermined height, forming excess concrete containing impurities at the pile head of the concrete pile. After the concrete pile hardens, when the severing material is lifted from the reinforcing bar cage, a crack along the severing surface occurs in the concrete pile, and the excess concrete is removed from the concrete pile. Since hand breakers and the like are not required, the working environment is not deteriorated by noise, vibration, dust, etc., and since static crushing materials and the like are not required, costs can be reduced and the burden of work preparation can be alleviated. Furthermore, since the edges can be cut more precisely than with static crushing materials, it is less likely to damage the concrete pile body.

[0043] In the tenth aspect, in the ninth aspect, in the step of removing the excess concrete, the edge severing material is lifted while being repeatedly raised and lowered. With this configuration, a lifting force is applied intermittently to the edge severing surface of the concrete pile, making it easier to break the concrete pile along the edge severing surface.

[0044] Although the present embodiment and modifications have been described, other embodiments may be obtained by combining the above-described embodiments and modifications in whole or in part.

[0045] Furthermore, the technology of the present invention is not limited to the above-described embodiments, and may be variously changed, substituted, or modified within the scope of the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to technological advances or other derived technologies, it may be implemented using that method. Therefore, the claims cover all embodiments that may fall within the scope of the technical idea. [Explanation of symbols]

[0046] 1: Pile head treatment structure 5: Concrete piles 6: Excess concrete 9: Pile hole 11: Reinforced concrete cage 12: Pile main reinforcement 21: Preparation muscle 22: Upper end muscle 25: Inner lifting rebar (lifting rebar) 26: External lifting rebar (lifting rebar) 31: Upper edge cutting material (edge ​​cutting material) 32: Upper edge cutting surface (edge ​​cutting surface) 33: Upper rebar grid (rebar grid) 34: Upper occlusion plate (occlusion plate) 35: Upper opening (opening) 41: Lower edge cutting material (edge ​​cutting material) 42: Lower edge cutting surface (edge ​​cutting surface) 43: Lower rebar grid (rebar grid) 44: Lower occlusion plate (occlusion plate) 45: Lower opening (opening) 51: Edge cutting cover

Claims

1. A pile head treatment structure for removing excess concrete from a concrete pile, A cylindrical reinforcing bar cage installed in a pile hole of the concrete pile; and an edge cutting material that forms an edge cutting surface at a predetermined height of the reinforcing bar cage, The edge insulating material covers the reinforcing bar cage except for an opening for passing concrete through, A pile head treatment structure characterized in that the edge cutting material is formed so that it can be lifted from the reinforcing bar cage.

2. The pile head treatment structure according to claim 1, characterized in that an opening is formed in at least the central portion of the edge cutting material.

3. The pile head treatment structure according to claim 1 or 2, characterized in that the edge cutting material covers 50% or more of the reinforcing bar cage in a plan view.

4. The edge cutting members are a plurality of edge cutting members that form edge cutting surfaces at a plurality of heights of the reinforcing bar cage, 3. The pile head treatment structure according to claim 1, wherein the upper edge severing material covers a wider area of ​​the reinforcing bar cage than the lower edge severing material.

5. A reinforcing bar is provided which is fixed to the upper end of the reinforcing bar cage, The edge cutting material is supported on the step reinforcement via a lifting rebar, A pile head treatment structure as described in claim 1 or claim 2, characterized in that the lifting rebar is cut from the stepping rebar, so that the edge cutting material can be lifted from the rebar cage by the lifting rebar.

6. The main reinforcement of the reinforcing bar cage protrudes above the edge cutting material, 3. The pile head treatment structure according to claim 1, wherein the protruding portion of the pile main reinforcement is covered with an edge cutting cover.

7. The pile head treatment structure described in claim 1 or claim 2, characterized in that the edge insulation material has a reinforcing bar grid in which reinforcing bars are arranged in a grid pattern, and a plurality of closing plates that close the openings of the reinforcing bar grid.

8. The pile head treatment structure according to claim 7, characterized in that the plurality of closing plates are installed in a staggered pattern except for the central portion of the reinforcing bar grid.

9. A pile head processing method for removing excess concrete from a concrete pile, A step of installing a cylindrical reinforcing bar cage in the pile hole of the concrete pile; A step of supporting an edge cutting material at a predetermined height of the reinforcing bar cage to form an edge cutting surface; pouring concrete into the pile hole to form the concrete pile; and removing the excess concrete by lifting the edge trimming material, In the step of forming the concrete pile, the edge insulating material covers the reinforcing bar cage except for an opening through which concrete passes, A pile head treatment method characterized in that in the process of removing the excess concrete, the edge cutting material is lifted from the reinforcing bar cage to create a crack along the edge cutting surface in the concrete pile.

10. 10. The pile head treatment method according to claim 9, wherein in the step of removing the excess concrete, the edge siding material is lifted by repeatedly raising and lowering the edge siding material.

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