JP2018071056A - Pile head reinforcement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile head reinforcement structure capable of: securing sufficient stress conveyance capability and fastening force; reducing a possibility of interference with a reinforcing bar embedded in a foundation; and enhancing construction work quality around a pile head part by reducing a number of welding processes and securing appropriate structural strength, as the pile head reinforcement structure.SOLUTION: A pile head reinforcement structure includes: a plurality of plate-form materials 4 protruded outward in a radial direction of a pile head part 2 laterally on an outer peripheral surface 2a of the pile head part, in a lengthwise posture in a vertical direction, the plate-form materials being provided in a circumferential direction of the pile head part leaving an appropriate interval: a stress conveyance member 5 for conveying stress between the pile head part and the plate-form material, the stress conveyance member having an inner side edge 5b connected to the pile head part and a plate surface 5a connected to the plate-form material, for connecting the plate-form material to the pile head part; a through-hole 6 formed to pierce through the plate-form material in a plate thickness direction; and a protrusion 7 protruded on the plate-form material, from a plate surface 4a thereof around the through-hole. The plate-form material and the stress conveyance member are embedded in foundation concrete C cast around the pile head part.SELECTED DRAWING: Figure 1

Description

  The present invention can sufficiently secure the stress transmission action and the fixing force, reduce the possibility of interference with the reinforcing bar embedded in the foundation, and reduce the welding man-hour as a pile head reinforcement structure. It is related with the pile head reinforcement structure which can improve the quality on construction around a pile head by doing, and can ensure structural strength appropriately.

  In order to transmit the force acting on the pile head between the pile and the foundation, the pile head has a pile head reinforcing member in which the upper side is embedded in the foundation and the lower side is provided so as to be able to transmit stress to the pile head Patent Document 1 is known as a reinforcing structure.

  The “connection method between ready-made piles and foundation slabs” in Patent Document 1 aims to provide a method for firmly connecting the ready-made piles and foundation slabs with a small amount of reinforcing bars, and has a diameter larger than the outer diameter of the ready-made piles. After attaching a short metal pipe with a guide on the inside and a reinforcing bar welded on the outside to the pile head part of the ready-made pile, the concrete for forming the foundation slab in the gap between the short metal pipe and the ready-made pile While filling and reinforcing the pile head, the ready-made pile and the formed foundation slab are integrated.

Japanese Patent Laid-Open No. 10-266227

  In Patent Document 1, a rebar having a circular cross section is generally welded to a short pipe. When using reinforcing bars to transmit the bending moment and axial force acting on the pile head between the foundation and the pile, in order to ensure sufficient stress transmission and firmly fix the reinforcing bars, The length needs to be 30 to 40 times the diameter of the reinforcing bar, and interference between the reinforcing bar and the reinforcing bar embedded in the foundation occurs.

  Further, as reinforcing bars, irregularly shaped reinforcing bars with irregularities are used in order to ensure good fixation, and since joining is performed by flare welding, the welding technique is extremely difficult and welding defects are likely to occur.

  Such a problem is not limited to the case where the reinforcing bar is joined to the short pipe, but is the same even when the reinforcing bar is joined directly to the pile head.

  Furthermore, since the transmission performance of force and stress in the pile head reinforcement structure is greatly affected by the quality of the welding quality when constructing the structure, it is desirable to reduce the number of weld joints in the pile head reinforcement structure as much as possible. Further, it has been desired to improve the workability of the pile head reinforcing structure by reducing the number of welding joints.

  The present invention was devised in view of the above-described conventional problems, and it is possible to sufficiently ensure the stress transmission action and the fixing force, and there is a possibility that interference with the bar arrangement embedded in the foundation occurs. As a pile head reinforcement structure, it is possible to improve the construction quality around the pile head by reducing the number of welding processes, and to provide a pile head reinforcement structure that can appropriately secure the structural strength. Objective.

  A pile head reinforcing structure according to the present invention is a structure for reinforcing a pile head that protrudes upward from the ground and is embedded in foundation concrete, and is located on the side of the outer peripheral surface of the pile head. A plurality of plate-like materials provided in the circumferential direction of the pile head at appropriate intervals, and projecting the plate-like material to the pile head. A first joint joined to the pile head and a second joint joined to the plate material, and the stress between the pile head and the plate material A transmitting stress transmitting member; a through-hole formed through each plate-like material in the plate thickness direction; and each plate-like material from the plate surface of the pile head around the through-hole. A protrusion projecting in the circumferential direction, and the plate-like material and the stress transmission member are placed in the foundation concrete around the pile head Characterized in that it is set.

  The stress transmission member is composed of a lower member joined to the lower part of the plate-like material in the vertical direction and an upper member joined to the upper part of the plate-like material.

  The stress transmission member is disposed so as not to overlap the protrusion in the vertical direction.

  The stress transmission member may be formed with an extended portion protruding outward in the radial direction of the pile head.

  The extension portion is arranged in the circumferential direction of the pile head so as not to protrude from the protruding portion.

  The stress transmission member is formed in an annular shape surrounding an outer peripheral surface of the pile head.

  In the pile head reinforcement structure according to the present invention, the stress transmission action and the fixing force can be sufficiently ensured, and the possibility of interference with the reinforcing bars embedded in the foundation can be reduced. As a result, it is possible to improve the construction quality around the pile head by reducing the number of welding steps, and to ensure the structural strength appropriately.

It is explanatory drawing explaining 1st Embodiment of the pile head reinforcement structure concerning this invention. It is explanatory drawing explaining the component which comprises the pile head reinforcement structure shown in FIG. It is a schematic side view which shows the modification of the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining 2nd Embodiment of the pile head reinforcement structure concerning this invention.

  EMBODIMENT OF THE INVENTION Below, the preferred embodiment of the pile head reinforcement structure concerning this invention is described in detail with reference to an accompanying drawing. FIG. 1 is an explanatory view for explaining a first embodiment of a pile head reinforcing structure according to the present invention. FIG. 1 (A) is a plan view, FIG. 1 (B) is a side view, and FIG. It is explanatory drawing explaining the component which comprises the pile head reinforcement structure shown in FIG. 2, Comprising: FIG. 2 (A) is a figure which shows the planar view and side view of a plate-shaped material, FIG. 2 (B) is stress transmission The figure which shows the side view and planar view of a member, FIG.2 (C) is a side view which shows a mode that the stress transmission member was weld-joined to the plate-shaped material.

  As is well known, the pile 1 is installed by being driven into the ground G so that the pile head 2 protrudes upward from the ground G. In this embodiment, the pile 1 is a hollow cylindrical body having a steel pipe portion at least in the pile head 2, and for example, a steel pipe pile (S pile), a concrete pile with an outer shell steel pipe (SC pile), or the like. Used.

  In these piles 1, when the foundation concrete C is placed and the hollow concrete of the pile 1 is filled with the foundation concrete C, or when the foundation concrete C is not filled, in order to block the opening of the pile head 2. A top plate is provided on the upper surface. The pile head 2 is embedded in the foundation concrete C that constructs the foundation together with the foundation reinforcement (not shown) arranged around the pile head 2 including the footing form.

  The pile head 2 is a joint portion between the foundation 1 and the pile 1 itself on the ground G side, and bending moment, shearing force, and axial force are applied by various external forces. A pile head reinforcement structure 3 is provided.

  The pile head reinforcing structure 3 according to the first embodiment is engaged with the foundation concrete C, and the plate material 4 for reinforcing the pile head 2 and the plate material 4 to the pile head 2 with high strength. And a stress transmission member 5 for joining so as to transmit stress.

  The plate-like materials 4 are arranged at appropriate intervals in the circumferential direction of the pile head 2 and preferably arranged at equal intervals. In the illustrated example, four plate-like members 4 are arranged around the pile head 2 at 90 ° intervals. The plate-like material 4 is formed of a steel flat plate material.

  The plate-like material 4 protrudes radially outward of the pile head 2 in a vertically vertical posture along the height direction of the pile head 2, and its plate surface 4 a is directed in the horizontal left-right direction. The plate-like material 4 is formed in a quadrangular shape in the illustrated example. However, the shape of the plate-like material 4 is not limited as long as the upper edge 4b and the lower edge 4c are both linear and parallel to each other.

  The plate-like material 4 is positioned on the side of the outer peripheral surface 2 a of the pile head 2. That is, the plate-like material 4 is set such that the height position of its upper edge 4 b is lower than the height position of the upper end 2 b of the pile head 2, and the whole plate-like material 4 is lateral to the outer peripheral surface 2 a of the pile head 2. It is arranged to be in.

  In the pile head reinforcing structure 3 according to the present embodiment, each plate-like material 4 is further provided with a through hole 6 and a protruding portion 7. The through-hole 6 allows the foundation concrete C placed around the pile head 2 to flow between the front and back surfaces of the plate-like material 4 so that the foundation concrete C can be filled around the plate-like material 4 and the plate-like material. In order to enhance the adhesion to the plate 4, the plate-like material 4 is formed sideways through the plate thickness direction (horizontal left-right direction).

  In the illustrated example, one through hole 6 is formed in each plate-like material 4, but a plurality of through holes 6 may be formed. In the case of forming a plurality, in order to suppress the protruding amount of the pile head 2 from the ground G, the through-hole 6 extends from the outer peripheral surface 2a side of the pile head 2 to the outside of the pile head 2 in the radial direction of the pile head 2. It is preferable to arrange it toward the side.

  Moreover, although not shown in figure, the foundation reinforcement arrange | positioned around the pile head 2 and the reinforcement reinforcing bar prepared separately may be inserted in the through-hole 6, Thereby, It is possible to further improve the bending strength and shear strength against the acting bending moment and shearing force.

  The protrusion 7 engages with the foundation concrete C that is placed around the pile head 2 and circulates through the through-hole 6 and the foundation concrete C that adheres to the plate surface 4a of the sheet material 4 to form a plate shape of the foundation concrete C. In order to increase the adhesion to the material 4 and to transmit the bending moment, shearing force and axial force acting on the pile head 2 more reliably between the pile 1 and the foundation, a plate is provided around each through hole 6. It protrudes from the plate surface 4 a of the shaped material 4 in the lateral direction, that is, toward the circumferential direction of the pile head 2. In the illustrated example, the protruding portion 7 is provided only on one side of the front and back sides of the plate-like material 4, but it goes without saying that it may be provided on both the front and back sides.

  The plate-like material 4 provided with the through holes 6 and the protrusions 7 is not directly joined to the pile head 2 itself, and therefore, even if it is provided so as to be in contact with the outer circumference 2 a of the pile head 2, The plate-like material 4 may be provided apart from 2 a, and is provided by being joined to the pile head 2 via a stress transmission member 5. In other words, the joining work to the pile head 2 of the plate-like material 4 is not required. In terms of workability, the plate-like material 4 may be temporarily welded to the pile head 2 to ensure the convenience of joining the stress transmission member 5 described later.

  The stress transmission member 5 is provided on each of the plate-like members 4 as a pair of upper and lower two pieces. The stress transmission members 5 are also provided at an appropriate interval in the circumferential direction of the pile head 2 according to the arrangement of the plate-like members 4, preferably at equal intervals. In the illustrated example, four places are provided around the pile head 2 in accordance with the positions of the four plate-like members 4. A plurality of plate-like members 4 may be provided on one stress transmission member 5.

  The stress transmission member 5 is bonded to the lower plate 8 with respect to each of the longitudinal plate-like members 4 as the lower member 8 and bonded to the upper portion, that is, the upper edge 4b. The upper member 9 is a pair of upper and lower parts. Of course, the upper member 9 is provided at a height position lower than the height position of the upper end 2b of the pile head 2 for joining with the pile head 2.

  Both the upper member 9 and the lower member 8 of the stress transmitting member 5 are pile heads in such a posture that they are laid sideways so that their plate surfaces 5a are directed vertically along the height direction of the pile head 2. 2 is provided protruding outward in the radial direction. The stress transmission member 5 is formed of a steel flat plate whose length direction is long along the circumferential direction of the pile head 2 and whose width direction is short along the radial direction of the pile head 2.

  The stress transmission member 5 is formed in an arc shape along the outer peripheral surface 2a so that both side edges in the width direction, that is, the inner end edge 5b facing the outer peripheral surface 2a of the pile head 2 are in contact with the outer peripheral surface 2a. In addition, the outer edge 5c is formed in an arc shape along the inner edge 5b, and the pair of lengthwise edges connecting the outer edge 5c and the inner edge 5b is not limited. The width dimension of the stress transmission member 5 along the radial direction of the pile head 2 is formed narrower than the protruding dimension of the plate-like material 4 protruding in the radial direction of the pile head 2.

  In the stress transmission member 5, the upper plate surface 5 a of the lower member 8 is a second joint portion that is welded to the lower edge 4 c of the plate-like material 4, and the lower member 8 is lower of the lower member 8. The plate surface 5 a is a second joint portion that is welded to the upper edge 4 b of the plate-like material 4. Therefore, when the plate-like material 4 and the stress transmission member 5 are viewed from the radial direction of the pile head 2, they are combined so as to exhibit a “shape”. The installation position of the plate-like material 4 joined to the plate surface 5a of the stress transmission member 5 forming the second joint is preferably set at the center in the length direction of the stress transmission member 5.

  In addition, both the upper member 9 and the lower member 8 of the stress transmission member 5 are the first joint portion in which the inner end edge 5b is welded to the pile head portion 2. Before the welded joint between the plate-like material 4 and the stress transmission member 5 is welded to the pile head 2, the workability is improved in advance in a factory or at the site. The stress transmission member 5 and the plate-like material 4 which are joined and assembled together via the plate surface 5a which is the second joint portion are welded and joined to the pile head 2 as a unit.

  The inner edge 5b, which is the first joint of the stress transmission member 5, is joined to the pile head 2 by horizontal fillet welding at the site. At this time, the inner edge 5b is formed in an arc shape along the outer peripheral surface 2a of the pile head 2 and is along the length direction of the stress transmission member 5, and is thus welded and joined at a long distance, The stress transmission member 5 is joined to the pile head 2 with high strength so as to prevent the out-of-plane deformation of 2.

  On the other hand, in order to extend the width direction dimension of the plate | board surface 5a of the 2nd junction part joined to the plate-shaped material 4 to the narrow stress transmission member 5, it goes to the radial direction outward of the pile head part 2. FIG. The extended portion 10 is formed by protruding. The extended portion 10 is formed in a form that slightly protrudes from the plate-like material 4 to both sides in the plate thickness direction.

  The mutual relationship between the stress transmission member 5 having the expansion portion 10 and joined to the plate-like material 4 and the protrusion 7 formed on the plate-like material 4 will be described. In detail, when a plurality of protrusions 7 are formed, the protrusions 7 closest to the pile head 2 are arranged so as not to overlap in the vertical direction.

  Specifically, the extended portion 10 with respect to the protruding portion 7 so that the distal end 10a of the extended portion 10 protruded radially outward of the pile head 2 does not reach the protruding portion 7 (indicated by dimension X in the drawing). The formation range is set. Even if the extended portion 10 is not formed, the width dimension of the stress transmission member 5 is set so that the outer edge 5 c does not reach the protruding portion 7.

  In addition, when the extension portion 10 is formed, the stress transmission member 5 has a protruding direction tip 7a of the protruding portion 7 protruding from the plate surface 4a of the plate-like material 4 toward the circumferential direction of the pile head 2, The formation range of the extended portion 10 with respect to the projecting portion 7 is set so that the extending direction edge 10b of the extended portion 10 that slightly protrudes from the plate-like material 4 does not protrude (shown as a dimension Y in the figure).

  The setting of the formation range of the stress transmission member 5 including the extended portion 10 prevents the flow action and adhesion of the foundation concrete C around the protruding portion 7 from being hindered. The transmission of the bending moment or the like acting on the pile head 2 between them is reliably performed without being blocked, and the appropriate reinforcement of the pile head 2 is ensured.

  The operation of the pile head reinforcing structure 3 according to the first embodiment will be described. In the construction, first, either the upper edge 4b or the lower edge 4c of the plate-like material 4 shown in FIG. Then, after joining one of the upper member 9 and the lower member 8 of the stress transmission member 5 through the plate surface 5a which is the second joint portion by downward horizontal fillet welding, Similarly, the other of the lower member 8 or the upper member 9 of the stress transmission member 5 is joined to either the lower edge 4c or the upper edge 4b through the plate surface 5a by downward horizontal fillet welding.

  Thereby, a plurality of the plate-like material 4 and the stress transmission member 5 are assembled as parts integrated to join the outer peripheral surface 2 a of the pile head 2. Since welding joining is a downward operation, it can be easily performed with good workability and high welding quality.

  Next, each stress transmission member incorporated in each of a plurality of parts on the outer peripheral surface 2a of the pile head 2 projecting upward from the ground G with an interval along the circumferential direction of the pile head 2 5 is joined to the outer peripheral surface 2a of the pile head 2 by downward horizontal fillet welding, whereby the pile head 2 is connected to the pile head 2 by the diameter of the pile head 2 from the inner edge 5b. A plurality of plate-like members 4 having through-holes 6 and protrusions 7 are arranged and provided so as to protrude in the direction.

  As for the inner end edge 5b which is the first joint portion, since the welding joint is a downward operation, it can be easily performed with good workability and high welding quality.

  After that, the foundation is constructed by placing the foundation concrete C on the ground G and burying the pile head 2 in the foundation concrete C together with the foundation reinforcement arranged in the periphery. The construction of the pile head reinforcement structure 3 is completed.

  In the pile head reinforcing structure 3 according to the first embodiment, the pile head reinforcing structure 3 has a through hole 6 and a fixing portion 7, and protrudes in a vertical posture outward in the radial direction of the pile head 2. A plurality of plate-like members 4 arranged along the circumferential direction of the surface 2a, and a stress transmission member 5 capable of firmly joining and fixing these to the pile head 2 by a simple welding operation, provide sufficient stress transmission action and fixing force. In addition, there is no risk of interference with the foundation reinforcement embedded in the foundation, and there are few components used for the reinforcement structure. The pile head reinforcement structure 3 can be obtained.

  In particular, since the number of parts constituting the pile head reinforcement structure 3 is small, and thus the structure 3 can be reduced in weight, even the pile head 2 of the pile 1 having a large diameter can be reinforced with excellent workability. .

  When the foundation concrete C is placed, the foundation concrete C circulates on both the front and back surfaces of the plate-like material 4 through the through holes 6 and adheres to the plate-like material 4 and also to the protruding portion 7. Thus, the pile head reinforcing structure 3 including the plate-like material 4 can be firmly bonded to the foundation.

  Moreover, about the fluidity | liquidity and force transmission effect | action in the protrusion part 7 and through-hole 6 periphery of the basic concrete C, it arrange | positions so that the stress transmission member 5 containing the expansion part 10 may not overlap with the protrusion part 7 in an up-down direction. Therefore, the flow of the foundation concrete C from below the plate-like material 4 and from the top to the through-hole 6 and the protrusion 7 is not obstructed, and the foundation concrete C around the protrusion 7 and the like is not disturbed. Fillability can be secured satisfactorily, and fixing of the plate-like material 4 to the foundation can be firmly secured. Furthermore, the bending portion, the shearing force, and the axial force acting on the pile head 2 can be reliably transmitted between the pile 1 and the foundation by the protruding portion 7 without being affected by the extended portion 10.

  As described above, in the pile head reinforcing structure 3 according to the present embodiment, the stress transmission action and the fixing force can be sufficiently ensured, and the possibility of interference with the bar arrangement embedded in the foundation is reduced. In addition, the pile head reinforcement structure 3 can improve the construction quality around the pile head 2 by reducing the number of welding steps, and can ensure the structural strength appropriately.

  Moreover, the extended part 10 is arrange | positioned so that it may not protrude from the protrusion part 7 in the circumferential direction of the pile head part 2, and the basic concrete C which flows around the through-hole 6 or the protrusion part 7 also by the said structure Without impeding the flow, it is possible to satisfactorily ensure the filling property of the foundation concrete C around the protrusions 7 and the like, and firmly secure the fixing of the plate-like material 4 to the foundation. Furthermore, the bending part, the shearing force, and the axial force which act on the pile head 2 can be reliably transmitted between the pile 1 and the foundation by the protruding portion 7.

  The extension portion 10 can secure the weld length of the plate surface 5a as the second joint portion, and the plate-like material 4 provided without welding to the pile head 2 can be attached away from the outer peripheral surface 2a. Therefore, workability can be improved.

  In this way, the plurality of plate-like members 4 embedded and fixed in the foundation are protruded in a vertically vertical posture outward in the radial direction of the pile head 2 on the side of the outer peripheral surface 2 a of the pile head 2. The pile head 2 is provided with an appropriate interval in the circumferential direction so that the bending moment, shearing force and axial force acting on the pile head 2 can be smoothly transferred between the foundation and the pile 1. The pile head 2 can be firmly reinforced.

  Further, since the plate-like material 4 is arranged on the side of the outer peripheral surface 2a of the pile head 2, there is no protrusion upward of the pile head 2, and both the plate-like material 4 and the stress transmission member 5 are embedded in the foundation. It is possible to prevent interference with the foundation bar arrangement, and to improve the workability of the foundation.

  When a force in the vertical direction acts on the protruding portion 7 of the plate-like material 4, stress associated with bending and shearing acts on the pile head 2 around the stress transmission member 5, but the plate-like material 4 is piled with the stress transmission member 5. Since it is joined to the head 2, the pile head 2 can be effectively stiffened, and a high strength pile head reinforcing structure 3 can be obtained.

  When joining the stress transmission member 5 to the pile head 2, it is easy to join the stress transmission member 5 to the pile head 2 by temporarily welding the plate-like material 4 to the outer peripheral surface 2 a of the pile head 2. Can be

  Since the protrusion 7 is formed so as to surround the through-hole 6 from its periphery, the protrusion 7 and the through-hole 6 are both provided reasonably and efficiently compared to the case where the protrusion 7 and the through-hole 6 are formed separately. Even if the external dimensions of the plate-like material 4 are small, a large number of them can be provided, and the basic concrete C that flows with good filling properties through the through holes 6 is smoothly fed around the protrusions 7. Thus, it is possible to ensure a close adhesion between the two.

  Since a plurality of the plate-like materials 4 are arranged around the pile head 2 with an interval, a wide fixing area can be secured by the plurality of the plate-like materials 4, and the space between the foundation and the pile 1 can be secured. The stress transmission action can be ensured accurately and sufficiently.

  In this embodiment, the plate-like material 4 is not welded to the pile head 2, and the pile head is connected via the stress transmission member 5 in which the inner edge 5 b is formed in an arc shape along the outer peripheral surface 2 a of the pile head 2. 2 when the plate-like material 4 is welded and joined, for example, an out-of-plane deformation occurs in the pile head 2 due to a tensile action caused by a vertical force. The pile head 2 can be prevented from being deformed by the stress to be applied, and the stress from the plate-like material 4 is efficiently applied to the pile head 2 while the stress transmission member 5 ensures stress relaxation for the pile head 2. Can communicate.

  FIG. 3 is a schematic side view showing a modification of the pile head reinforcing structure shown in FIG. 1. A hatched region R indicates a region where the plate-like material 4 is disposed via the stress transmission member 5. Thus, the arrangement of the plate-like members 4 and the like may be a staggered arrangement that alternately turns up and down along the circumferential direction of the pile head 2.

  If it is a staggered arrangement, for example, even if the pile 1 has a small diameter and the number of plate-like members 4 is limited due to the small outer peripheral dimensions, the necessary number of plate-like members 4 can be provided by distributing the piles up and down. Even in the case of a large-diameter pile 1, a large number of plate-like materials 4 can be disposed avoiding the positional interference of the adjacent stress transmission members 5, so that the necessary strength of the pile head 2 is achieved. Can be secured appropriately.

  FIG. 4 is explanatory drawing explaining 2nd Embodiment of the pile head reinforcement structure 3 concerning this invention, Comprising: FIG. 4 (A) is a top view, FIG.4 (B) is a side view. The second embodiment is different from the first embodiment in that the upper member 9 of the stress transmission member 5 is omitted. If comprised in this way, a welding joint location can be reduced and construction efficiency can be improved.

  The second difference is that the stress transmission member 5 is formed in an annular shape surrounding the outer peripheral surface 2 a of the pile head 2. Therefore, a plurality of plate-like materials 4 are joined to the stress transmission member 5. Thereby, compared to welding the stress transmission member 5 to the pile head 2 individually by the number of sheets 4, for example, the stress transmission member 5 is temporarily welded to the pile head 2, Then, it is possible to join all the adjacent plate-shaped materials 4 by horizontal fillet welding, and it can improve workability and construction efficiency.

  Moreover, if the annular stress transmission member 5 is joined to the pile head 2, the pile head 2 can be continuously reinforced in the circumferential direction, and even if the upper member 9 is omitted, a considerable strength is ensured. can do.

DESCRIPTION OF SYMBOLS 1 Pile 2 Pile head 2a Peripheral surface of pile head 3 Pile head reinforcement structure 4 Plate material 4a Plate surface of plate material 5 Stress transmission member 5a Plate surface of stress transmission member 5b Inner edge of stress transmission member 6 Through Hole 7 Protruding part 8 Lower member 9 Upper member 10 Expansion part C Foundation concrete G Ground

Claims (6)

It is a structure to reinforce the pile head that protrudes upward from the ground and is embedded in the foundation concrete,
A plurality of plates provided in the outer peripheral surface side of the pile head so as to protrude vertically outward in the vertical direction of the pile head in a vertical orientation, and are provided at appropriate intervals in the circumferential direction of the pile head. In order to join the plate-like material and the plate-like material to the pile head, the first-joint portion joined to the pile head portion and the second joint portion joined to the plate-like material, A stress transmission member that transmits stress between the pile head and the plate-like material, a through-hole formed in each plate-like material so as to penetrate in the plate thickness direction, and each plate-like material, A protrusion projecting from the plate surface around the through-hole toward the circumferential direction of the pile head,
The pile head reinforcing structure, wherein the plate-like material and the stress transmission member are embedded in the foundation concrete that is placed around the pile head.   The said stress transmission member consists of the lower member joined with respect to the lower part of the said plate-shaped material of portrait orientation, and the upper member joined with respect to the upper part of this plate-shaped material, It is characterized by the above-mentioned. The pile head reinforcing structure according to 1.   The pile head reinforcement structure according to claim 1, wherein the stress transmission member is arranged so as not to overlap the protruding portion in the vertical direction.   The pile head reinforcement structure according to any one of claims 1 to 3, wherein the stress transmission member is formed with an extended portion by projecting radially outward of the pile head.   The pile head reinforcing structure according to claim 4, wherein the extension portion is disposed in a circumferential direction of the pile head so as not to protrude from the protruding portion.   The pile head reinforcement structure according to any one of claims 1 to 5, wherein the stress transmission member is formed in an annular shape surrounding an outer peripheral surface of the pile head.

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