JP2019190080A - Pile head reinforcement structure and pile head reinforcement unit - Google Patents

Abstract

To provide a pile head reinforcement structure and a pile head reinforcement unit that can ensure a stress transfer effect and an anchorage force sufficiently and can improve quality of construction around a pile head to ensure structural strength properly by reducing a risk of interference with an arrangement of bar buried in a basement as well as enduring a high intensity/high quality weld joint as a pile head reinforcement structure.SOLUTION: A structure comprises a plate for stress transfer 5 conducting stress transfer between a pile head and a plate-like material having plate-like materials 4 arranged at a circumferential direction of the pile head with an appropriate interval protruding to a lateral direction of an outer peripheral surface 2a of a pile head 2 with a longitudinal posture in a direction outward to a radial direction of the pile head, a first junction 13 jointing to the pile head, and a second junction 9 jointing the plate-like material, an open hole 7 formed in the plate-like material, and a projection 8 projecting to the circumferential direction of the pile head around the open hole in the plate-like material, the second junction fits into concave recesses 10, 14 formed in the plate-like material and the plate for stress transfer, and is comprised of a weld junction along the concave recess.SELECTED DRAWING: Figure 1

Description

  The present invention can sufficiently ensure the stress transmission action and the fixing force, and can reduce the possibility of interference with the reinforcing bar embedded in the foundation. It is related with the pile head reinforcement structure and pile head reinforcement unit which can improve the quality on construction around a pile head by ensuring quality welding joining, 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.

  Also, as reinforcing bars, irregularly shaped reinforcing bars with irregularities are used in order to ensure good fixation, and since joining is performed by vertical 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 joint strength by welding joint, it has been demanded to secure a weld joint having as high strength and quality as possible.

  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. In addition to being able to reduce, it is possible to improve the construction quality around the pile head by ensuring high strength and high quality welded joints as a pile head reinforcement structure, and it is possible to ensure structural strength appropriately It aims at providing a pile head reinforcement structure and a pile head reinforcement unit.

  The pile head reinforcing structure according to the present invention is a structure for reinforcing a pile head protruding upward from the ground and embedded in the foundation concrete, and on the side of the outer peripheral surface of the pile head, A plurality of plate-like materials that protrude in a vertically vertical posture outward in the radial direction of the head and are arranged at appropriate intervals in the circumferential direction of the pile head; In order to join to a part, it has the 1st joined part joined to this pile head, and the 2nd joined part joined to this plate-like material, between this pile head and this plate-like material A stress transmitting plate material for transmitting stress, a through hole formed through the plate material in the plate thickness direction, and the plate material from the plate surface around the through hole to the pile head. And the second joint portion is formed on at least one of the plate material and the stress transmission plate material. The other is fitted into the groove and is formed by welding joining along the concave groove, and the plate material and the stress transmission plate are embedded in the foundation concrete placed around the pile head. It is characterized by.

  The stress transmission plate is provided with at least a pair of upper and lower plates, and is joined to at least an upper portion and a lower portion of the plate-like material vertically oriented in the vertical direction.

  In the foundation concrete, splitting reinforcing bars to which the foundation concrete adheres are arranged on the front and back of the plate surface of the plate-like material so as to intersect with the protruding portion and the through hole.

  A pile head reinforcement unit according to the present invention is a pile head reinforcement unit for reinforcing a pile head that protrudes upward from the ground and is embedded in the foundation concrete, and is provided on the outer peripheral side of the pile head. A plurality of plate-like materials that are protruded radially outward of the pile head in a vertically vertical posture, and arranged at appropriate intervals in the circumferential direction of the pile head, and the plate-like material In order to join to the pile head, the pile head has a first joint joined to the pile head and a second joint joined to the plate-like material, and the pile head and the plate-like material A stress transmitting plate that transmits stress between the plate, the through hole formed in the plate in the thickness direction, and the plate from the plate surface around the through hole. A protrusion projecting in the circumferential direction of the head, and the second joint is at least one of the plate material and the stress transmission plate Fitted and the other concave groove formed towards, characterized in that it is constituted by welding along the concave groove.

  The stress transmission plate is provided with at least a pair of upper and lower plates, and is joined to at least an upper portion and a lower portion of the plate-like material vertically oriented in the vertical direction.

  The stress transmission plate is provided with an energy absorbing portion between the first joint and the second joint.

  In the pile head reinforcing structure and the pile head reinforcing unit 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. At the same time, as the pile head reinforcement structure, high-strength and high-quality welded joints can be secured, thereby improving the construction quality around the pile head and ensuring the structural strength appropriately.

It is explanatory drawing explaining suitable one Embodiment of the pile head reinforcement structure and pile head reinforcement unit which concern on this invention. It is explanatory drawing explaining the component of the pile head reinforcement unit used for the pile head reinforcement structure shown in FIG. It is a side view which shows a mode that the plate member for stress transmission was weld-joined to the plate-shaped material shown in FIG. 2, and the pile head reinforcement unit was comprised. It is explanatory drawing explaining the AA line in FIG.1 and FIG.3, a BB line, and CC line arrow cross section. It is explanatory drawing explaining the modification which incorporated the split suppression muscle in the pile head reinforcement structure and pile head reinforcement unit shown in FIG. It is explanatory drawing explaining the other modification which incorporated the split suppression muscle in the pile head reinforcement structure and pile head reinforcement unit shown in FIG. It is explanatory drawing explaining the other modification of the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining the other modification of the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining the modification of the pile head reinforcement unit shown in FIG. It is explanatory drawing explaining the other modification of the pile head reinforcement unit shown in FIG. It is explanatory drawing explaining the further another modification of the pile head reinforcement structure shown in FIG. It is explanatory drawing explaining the further another modification of the pile head reinforcement structure shown in FIG.

  Hereinafter, preferred embodiments of a pile head reinforcing structure and a pile head reinforcing unit according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory view illustrating a preferred embodiment of a pile head reinforcing structure and a pile head reinforcing unit according to the present invention, in which FIG. 1 (A) is a plan view, FIG. 1 (B) is a side view, FIG. 2 is an explanatory diagram for explaining the components of the pile head reinforcing unit used in the pile head reinforcing structure shown in FIG. 1, and FIG. 3 is a diagram of welding the stress transmitting plate material to the plate material shown in FIG. It is a side view which shows a mode.

  As shown in FIG. 1, the pile 1 is installed by being driven into the ground G so that the pile head 2 protrudes upward from the ground G, as is well known. 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, foundation concrete Q is placed around the pile, and the inside of the pile 1 is filled with the foundation concrete as pile head filling concrete, or when the foundation concrete Q is not filled, In order to close the opening of the pile head 2, a top plate is provided on the upper surface thereof. The pile head 2 is embedded in the foundation concrete Q 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.

  As shown in FIGS. 1 to 3, the pile head reinforcing structure and the pile head reinforcing unit according to this embodiment include a plate-like material 4 for engaging the pile head 2 with the foundation concrete Q, and a plate-like material 4. And a plate 5 for stress transmission for transmitting stress between the pile head 2 and the pile head 2. A pile head reinforcing unit 6 for reinforcing the pile head 2 is constituted by the two upper and lower pairs of the stress transmission plate 5 and the single plate-like material 4.

  The plate-like material 4 is made of a flat plate material made of steel and having a constant plate thickness, and is arranged so that the plate surface 4a faces in the horizontal direction (the circumferential direction of the pile head 2), and the length direction is the pile head. 2, the width direction is arranged in the height direction of the pile head 2 and used. The stress transmission plate 5 is also made of a flat plate material made of steel and having a constant plate thickness, and the plate surface 5a is arranged so as to face in the vertical direction (the height direction of the pile head 2).

  A plurality of the plate-like members 4 are arranged on the side of the outer peripheral surface 2a of the pile head 2 at an appropriate interval in the circumferential direction of the pile head 2, preferably 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 protruded with its longitudinal direction directed outward in the radial direction of the pile head 2 in a vertically vertical posture along the height direction of the pile head 2, and its width direction is It is directed in the height direction of the pile head 2.

  Specifically, the outer shape of the plate-like material 4 is such that the pile side edge 4b facing the pile head outer peripheral surface 2a is formed in a straight line along the height direction of the pile head 2 and the pile side edge 4b is vertically An upper edge 4c and a lower edge 4d that extend outward in the length direction from the end outward in the radial direction of the pile head 2 are formed in a straight line substantially orthogonal to the pile side edge 4b, and the pile side edge 4b The projecting side edge 4e connecting the upper edge 4c and the lower edge 4d on the opposite side is formed in an arc shape without a projecting angle portion. By forming the projecting side edge 4e abutted with the foundation concrete Q in an arc shape, it is possible to make it difficult for cracks due to stress concentration to occur.

  The plate-like material 4 is disposed on the side of the outer peripheral surface 2 a of the pile head 2. In the illustrated example, the plate-like material 4 is such that the height position of the upper edge 4c is the same as or lower than the height position of the upper end 2b of the pile head 2, and the whole plate-like material 4 is It arrange | positions so that it may exist in the outer peripheral surface 2a side of the pile head 2. FIG.

  The plate-like material 4 is provided with a through hole 7 and a protruding portion 8. The through-hole 7 distributes the foundation concrete Q placed around the pile head 2 between the front and back surfaces 4a of the plate-like material 4 so that the foundation concrete Q can be filled around the plate-like material 4 and the plate-like shape can be obtained. In order to enhance the adhesion between the material 4 and the foundation concrete Q and to increase the engagement force of the plate material 4 with the foundation (foundation concrete Q), the thickness direction of the plate material 4 (the circumference of the pile head 2) Direction) and formed sideways.

  In the illustrated example, one through hole 7 is formed in the plate-like material 4, but a plurality of through holes 7 may be formed. When forming a plurality, in order to suppress the protruding amount of the pile head 2 from the ground G, arrange the plates in the length direction of the plate-like material 4 so that the vertical width dimension of the plate-like material 4 does not increase. Is preferred.

  Moreover, although not shown in the figure, a basic reinforcing bar arranged around the pile head 2 or a separately prepared reinforcing bar may be inserted into the through hole 7, It is possible to further improve the bending strength and shear strength against the acting bending moment and shearing force.

  The protrusion 8 engages with the foundation concrete Q that is placed around the pile head 2 and circulates through the through-hole 7 or the foundation concrete Q that adheres to the plate surface 4a of the plate-like material 4, and the foundation (foundation concrete Q) In order to increase the bonding strength of the steel plate 4 to the pile-like 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, The plate-like material 4 protrudes laterally from the plate surface 4 a, that is, toward the circumferential direction of the pile head 2. In the illustrated example, the protrusions 8 are provided only on one side of the front and back sides of the plate-like material 4, but of course, they may be provided on both sides of the front and back sides.

  The plate-like member 4 having the through-holes 7 and the protruding portions 8 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 circumferential surface 2a of the pile head 2, the outer circumferential surface. The plate-like material 4 may be provided with a gap S away from 2a. The plate-like material 4 is provided by being joined to the pile head 2 via the pair of upper and lower stress-transmitting plate materials 5 described above. In other words, the joining work with respect to the pile head 2 of the plate-like material 4 is not required.

  Furthermore, a concave groove 10 is formed in the plate-like material 4 as shown in FIG. 2 (A) in order to constitute a later-described second joint 9 (see FIG. 3). The concave groove 10 is formed in a notch shape extending in the length direction of the plate-like material 4 from the pile side edge 4b.

  Specifically, the concave groove 10 of the plate-like material 4 is opened at the pile side edge 4b, and a pair of width direction groove edges 10a facing in the width direction (the height direction of the pile head 2) and the length thereof. It is divided from three directions by one groove bottom 10b that is opposite to the pile side edge 4b in the direction. The concave grooves 10 of the plate-like material 4 correspond to the two stress transmission plate materials 5 in a pair of upper and lower, specifically, at a position lower and lower than the upper edge 4c of the plate-like material 4. A pair of upper and lower portions are formed at two positions above 4d.

  As shown in FIG. 1 to FIG. 3, the stress transmission plate 5 is provided on each of the plurality of plate-like members 4 in pairs of upper and lower. The stress transmission plate 5 is 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 arrangement of the four plate-like members 4.

  The pair of upper and lower stress transmission plate members 5 are provided at the upper and lower portions of the plate member 4 provided in a vertically oriented posture. The stress transmission plate 5 provided on the upper portion of the plate-like material 4 is provided at a height position lower than the height position of the upper end 2 b of the pile head 2 for joining with the pile head 2.

  The stress transmission plate 5 is provided so as to protrude outward in the radial direction of the pile head 2 in a posture laid sideways so that the plate surface 5 a faces vertically in the height direction of the pile head 2. The stress transmission plate member 5 is roughly composed of a base portion 11 formed in an arc shape along the circumferential direction of the pile head portion 2, and an extending portion 12 extending from the base portion 11 to the radially outer side of the pile head portion 2. It is formed in a T shape.

  The base portion 11 of each stress transmission plate 5 has a pile-side end facing the outer circumferential surface 2a of the pile head 2, with the circumferential direction of the pile head 2 being the length direction and the radial direction of the pile head 2 being the width direction. The edge 5 b is welded to the outer peripheral surface 2 a of the pile head 2, whereby the first joint 13 that joins the stress transmission plate 5 to the pile head 2 is configured. The width dimension of the base portion 11 of the stress transmission plate 5 is the projection size of the plate-like material 4 protruding outward in the radial direction of the pile head 2 (the protruding side edge of the plate-like material 4 from the pile head outer peripheral surface 2a). It is formed smaller than the distance (up to 4e).

  The extension portion 12 of each of the two stress transmission plates 5 in a pair of upper and lower sides has a circumferential direction of the pile head 2 as a width direction and a radial direction of the pile head 2 as a length direction, and each extension portion 12 has a length direction. In FIG. 2A, a concave groove 14 for forming the second joint portion 9 is formed at the central position in the width direction of the distal end portion 5c in the length direction (on the side opposite to the base portion 11). It is formed.

  The concave groove 14 is formed in a cutout shape extending in the length direction of the extended portion 12 from the extended portion distal end portion 5c. Specifically, the concave groove 14 of the stress transmission plate 5 is opened at the distal end portion 5c of the extension portion, and a pair of width direction groove edges 14a facing in the width direction (circumferential direction of the pile head 2) and the length thereof. It is partitioned from three directions by one groove bottom 14b which is on the opposite side to the extending portion tip portion 5c in the vertical direction.

  As shown in FIG. 3, the stress transmission plate 5 and the plate-like material 4 are formed by fitting the concave grooves 10 and 14 to each other so that the groove bottom 14 b and the plate of the concave groove 14 of the stress transmission plate 5 are obtained. The groove bottoms 10b of the concave grooves 10 of the shaped material 4 are abutted against each other, and at the same time the pair of widthwise groove edges 14a of the recessed grooves 14 of the stress transmitting plate 4 are along the plate surface 4a of the plate-like material 4, The pair of width direction groove edges 10 a of the concave groove 10 of the shaped material 4 are assembled so as to be along the plate surface 5 a of the extending portion 11 of the stress transmission plate material 5.

  The stress transmitting plate member 5 and the plate member 4 are formed along the concave grooves 10 and 14, that is, the pair of width direction groove edges 10 a and 14 a and the plate surfaces 4 a and 5 a are the plate member 4. By welding and joining with a pair of upper and lower long welding lengths that go around the extended portion tip portion 5c of the stress transmission plate 5 from the pile side end 4b and reach the pile side end 4b of the plate 4 again The second joint 9 for joining the stress transmitting plate 5 to the plate 4 is configured. The weld joint w is, for example, fillet weld, and may be either continuous welding or intermittent welding. Further, the weld joint w does not have to go around the extended portion tip portion 5c.

  In FIG. 2 (A), a case has been described in which the concave grooves 10 and 14 are formed and assembled in both the stress transmission plate 5 and the plate-like material 4, and the two are welded together. , 14 may be provided on at least one of the stress transmission plate 5 and the plate-like material 4, and a concave groove 10 is formed only in the plate-like material 4 as shown in FIG. The extension portion tip portion 5c of the stress transmission plate 5 is abutted against the groove bottom 10b of the groove 10, and the pair of widthwise groove edges 10a of the concave groove 10 are assembled along the plate surface 5a of the tip portion 5c. Alternatively, as shown in FIG. 2 (C), a concave groove 14 is formed only in the stress transmission plate 5, and the pile-side edge 4 b of the plate-like material 4 is abutted against the groove bottom 14 b of the concave groove 14. Thus, the pair of width direction groove edges 14 a of the concave groove 14 is along the plate surface 4 a of the plate-like material 4. Assembled Te, and may be formed of the second bonding portion 9 by performing the welding w.

  In particular, with the configuration shown in FIG. 2 (A), both the plate-like material 4 and the stress-transmitting plate material 5 are fixed and set in an orthogonal state by fitting the concave grooves 10 and 14 together. The workability at the time of welding can be remarkably improved. On the other hand, one concave groove 10 may be formed in the center of the plate material 4 in the vertical width direction, and only one stress transmission plate material 5 may be joined.

  The joining of the plate-like material 4 and the stress transmission plate 5 by the second joint 9, that is, the manufacture of the pile head reinforcement unit 6 is performed by welding the stress transmission plate 5 to the pile head 2 by the first joint 13. Before work, good workability is performed in the factory or on site. And the pile head reinforcement unit 6 comprised including the 2nd junction part 9 is welded and joined to the pile head part 2 on-site, and the 1st junction part 13 is comprised.

  About the 1st junction part 13, the pile side edge 5b of the board | plate material 5 for stress transmission is joined with the pile head 2 by horizontal fillet welding. At this time, the pile-side 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 base 11 of the stress transmission plate 5, so that a long welding length can be secured. In order to prevent the out-of-plane deformation of the pile head 2, the stress transmission plate member 5 and the pile head reinforcement unit 6 are joined to the pile head 2 with high strength.

  About the welding joining of the 1st and 2nd junction parts 9 and 13, the board | plate material 5 for stress transmission is previously joined to the pile head 2 by the 1st junction part 13, and it is for stress transmission by the 2nd junction part 9 after that. Of course, the plate-like material 4 may be joined to the plate material 5.

  As shown in FIGS. 1, 3, and 4, an energy absorbing portion 15 is formed between the first joint portion 13 and the second joint portion 9 in the stress transmission plate 5. 4A is a cross-sectional view taken along line AA in FIGS. 1 and 3, FIG. 4B is a cross-sectional view taken along line BB in FIGS. 1 and 3, and FIG. 4C is FIG. And the CC arrow directional cross section in FIG. 3 is shown, respectively.

  As shown in FIG. 4A, the second joint portion 9 has a cross-shaped large cross-sectional area by fitting the plate-like material 4 and the stress transmission plate material 5 to form the first joint portion 13. As shown in FIG. 4C, the base portion 11 of the stress transmission plate member 5 is wide and has a large cross-sectional area, whereas the extension portion 12 between the first joint portion 13 and the second joint portion 9. As shown in FIG. 4B, it is narrower than the base 11 and has a smaller cross-sectional area.

  Thereby, the extension part 12 between the 1st junction part 13 and the 2nd junction part 9 tends to produce the deformation | transformation most, and functions as the energy absorption part 15 by which an energy absorption effect | action is acquired by this.

  In addition, as shown in FIGS. 1 and 2, the extension portion 12 of the stress transmission plate member 5 gradually extends outwardly in the radial direction of the pile head 2 from the base 11 toward the extension portion tip portion 5 c. The width direction side edge 5d is formed in an inward arc shape that dents the extension part 12 so that the width dimension is narrowed, and thereby the cross-sectional area is set small on the extension part front end part 5c side, and the energy absorption action Is configured to be obtained.

  In particular, since the width direction side edge 5d has an inward arc shape, the stress can be transmitted efficiently, and the energy absorbing portion 15 can surely cause the deformation in advance.

  The operation of the pile head reinforcement structure 3 and the pile head reinforcement unit 6 according to the present embodiment will be described. In the construction, as shown in FIGS. Alternatively, one of the upper and lower pair of stress transmission plates 5 is assembled and welded to one of the lower portions via the concave grooves 10 and 14 to form the second joint portion 9. Then, the other of the other plate for stress transmission 5 is assembled and welded to the other one of the lower part or the upper part of the plate-like material 4 via the concave grooves 10 and 14 and second-joined. Part 9 is configured.

  As a result, a plurality of pile head reinforcing units 6 that are integrated to join the plate material 4 and the stress transmission plate material 5 to the outer peripheral surface 2a of the pile head 2 are assembled. Since the welding joint w can be operated downward, it can be easily performed with good workability and high welding quality. Also, the plate-like material 4 and the stress-transmitting plate material 5 can be welded and joined around the concave grooves 10 and 14 with a pair of upper and lower long welding lengths, preventing brittle fracture at the welded portion and joining with high strength. can do.

  Next, the pile heads 2 that are protruded upward from the ground G are incorporated into each of the plurality of pile head reinforcement units 6 at intervals along the circumferential direction of the pile heads 2. The pile side edge 5b of each stress transmission member 5 is joined to the outer peripheral surface 2a of the pile head 2 by horizontal fillet welding, whereby the first joint 13 is formed. In this way, a plurality of plate-like materials 4 having through holes 7 and protruding portions 8 are arranged and provided on the pile head 2 so as to protrude in the radial direction of the pile head 2.

  The first joint 13 can also be easily performed with good workability and high welding quality because the welding joint is a downward work.

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

  In the pile head reinforcement structure 3 and the pile head reinforcement unit 6 according to the present embodiment, the pile head reinforcement unit 6 has a through hole 7 and a protruding portion 8, 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 outer peripheral surface 2a of the head 2, and a plate 5 for stress transmission that can be firmly and firmly fixed to the pile head 2 by a simple and good welding operation, Sufficient stress transmission action and fixing force can be secured, there is no risk of interference with the foundation reinforcement embedded in the foundation, and there are few components used for the reinforcing structure, The construction quality around the pile head 2 can be improved, and an excellent 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 Q is placed, the foundation concrete Q circulates on both the front and back surfaces of the plate-like material 4 through the through holes 7 and adheres to the plate-like material 4 and also to the protruding portion 8. Thus, the pile head reinforcing structure 3 including the plate-like material 4 can be firmly bonded to the foundation.

  As described above, in the pile head reinforcing structure 3 and the pile head reinforcing unit 6 according to the present embodiment, the stress transmission action and the fixing force can be sufficiently ensured, and the reinforcing bar embedded in the foundation and In addition to reducing the possibility of interference, the pile head reinforcement structure 3 can improve the construction quality around the pile head 2 by ensuring high strength and high quality welded joints. The structural strength can be ensured appropriately.

  In particular, by fitting the concave grooves 10 and 14 to each other, both the plate-like material 4 and the stress transmission plate material 5 can be fixed and set in an orthogonal state, and pile head reinforcement to the pile head 2 It is possible to increase the joining accuracy of the unit 6, thereby improving the vertical accuracy of the plate-like material 4 and the horizontal installation accuracy of the protruding portion 8, and making the reinforcing effect of the pile head 2 remarkably excellent. it can.

  Moreover, in the 2nd junction part 9, since it weld-joins w by the fitting of the recessed grooves 10 and 14, for example, joining of the plate 5 for stress transmission with respect to the plate-like material 4 will be from both upper and lower sides, and it will be caused by deformation due to welding heat. Problems such as broken umbrellas can be prevented.

  Furthermore, the protrusion 8 can reliably transmit the bending moment, shearing force, and axial force acting on the pile head 2 between the pile 1 and the foundation. At this time, the plate-like material 4 may be deformed out of the plane around the protruding portion 8, but the plate around the protruding portion 8 can be obtained by fitting the stress-transmitting plate material 5 to the plate-like material 4. The strength of the material 4 can be increased.

  Since a long weld length can be secured vertically by the concave grooves 10 and 14 constituting the second joint 9, the plate material 4 provided without welding to the pile head 2 is extended from the stress transmission plate 5. It is also possible to attach it away from the outer peripheral surface 2a via the portion 12, and 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 the plate-like material 4 and the stress transmission plate 5 are embedded in the foundation. It is possible to prevent interference with the foundation reinforcement, and to improve the workability of the foundation.

  When a vertical force acts on the protruding portion 8 of the plate-like material 4, stress associated with bending and shearing acts on the pile head 2 around the stress-transmitting plate material 5. Since the pile head 2 is joined to the pile head 2, the pile head 2 can be effectively stiffened, and a high-strength pile head reinforcement structure 3 can be obtained.

  Since the protrusion 8 is formed in a form surrounding the through-hole 7 from its periphery, both of these are provided reasonably and efficiently compared to the case where the protrusion 8 and the through-hole 7 are formed separately. Even if the outer dimensions of the plate-like material 4 are small, a large number of them can be provided, and the foundation concrete Q that flows with good filling properties through the through holes 7 is smoothly fed around the protrusions 8. 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 and joined to the pile head 2, and the gap S is provided away from the outer peripheral surface 2 a so that the pile side edge 5 b is the outer peripheral surface of the pile head 2. The stress can be transmitted to the pile head 2 via the stress transmitting plate 5 formed in an arc shape along 2a, and when the plate 4 is welded, the pile head is pulled by, for example, a vertical force. It is possible to prevent the pile head 2 from being deformed by stress concentrated locally on the pile head 2 such as the occurrence of out-of-plane deformation in the portion 2 and to relieve the stress on the pile head 2 with the stress transmission plate 5 The stress from the plate-like material 4 can be efficiently transmitted to the pile head 2 while ensuring the above.

  Since the energy transmission portion 15 is provided on the stress transmission plate 5 between the first joint portion 13 and the second joint portion 9, the first and second joint portions 9 and 13 whose stress is a welded portion. It is possible to prevent brittle fractures from occurring in a concentrated manner.

  5 and 6 show a modification of the above embodiment. FIG. 5A is a plan view of a state in which the split restraining muscle 16 is incorporated in the pile head reinforcing unit 6, FIG. 5B is a side view thereof, and FIG. 6A is a side view when the locking groove 17 is formed in the plate-like material 4, and FIG. 6B is a side view when the through-hole 18 is formed in the plate-like material 4. is there.

  In these modifications, the foundation concrete Q is provided with a split restraining bar 16 that is attached to the pile head reinforcing unit 6 for attaching the foundation concrete Q and suppressing the split fracture. And this splitting suppression muscle 16 is plate-shaped so that it may penetrate through the lower part of the protrusion part 8 in order to arrange the reinforcement in the front and back of the plate surface 4a of the plate-like part 4 and intersecting with the protrusion part 8 and the through-hole 7. It is formed by being folded back in a U shape below the material 4, and thereby extends toward the front and back surfaces 4 a of the plate-like portion 4.

  In FIG. 5, the splitting suppression muscle 16 is attached to and supported by another basic bar arrangement with a wire or the like, and is provided apart from the plate-like material 4. In FIG. 6A, a locking groove 17 is formed in the lower edge 4d of the plate-like material 4, and the splitting suppression muscle 16 is locked to the locking groove 17 for positioning. In FIG. 6 (B), a through hole 18 is formed in the lower part of the protruding portion 8, and the split inhibiting muscle 16 is inserted through the through hole 18 for fixing the position.

  According to the locking groove 17 and the through-hole 18, it is possible to improve workability by suppressing the movement of the splitting suppression muscle 16 when attaching to the foundation reinforcing bar by a wire or the like.

  Split cracks derived from the projecting portion 8 by incorporating the split restraining bars 16 that suppress the splitting of the foundation concrete Q into the pile head reinforcement unit 6 and arranged so as to intersect with the through holes 7 and the projecting portions 8 of the plate-like material 4. Can be prevented and the deformation performance of the pile head 2 can be improved. In other words, it is possible to exert the reinforcing action by the pile head reinforcing unit 6 including the through-holes 7 and the protruding portions 8 at the foundation portion whose strength is increased by the splitting inhibiting muscles 16 and to ensure an excellent pile head reinforcing effect. be able to.

  In the present modification, the split restraining muscles 16 are illustrated as being formed by being folded back in a U shape at the lower part of the protruding portion 8 of the plate-like material 4, but on the front and back plate surfaces 4 a of the plate-like material 4, It is not limited to such a configuration as long as it is arranged so as to intersect with the through-hole 7 and the projecting portion 8, for example, formed by being folded back in a U shape at the upper portion of the projecting portion 8, Of course, even if the configuration is such that two linear reinforcing bars (split suppression bars 16) are arranged on the front and back sides of the plate-like material 4, the reinforcing effect can be improved.

  7 and 8 show another modification of the above embodiment. 7A is a plan view of the pile head reinforcement structure 3 of the pile head 2 having a large diameter, FIG. 7B is a side view thereof, and FIG. 8A is a pile head reinforcement of the pile head 2 having a very large diameter. FIG. 8B is a plan view of the structure 3, and FIG. 8B is a side view thereof (the hatched portion is the mounting position of the pile head reinforcing unit 6).

  As shown in FIG. 7, in the case of a large diameter, the pile head 2 is appropriately reinforced by providing a large number of pile head reinforcement units 6 shown in FIGS. 1 to 6 in the circumferential direction of the pile head 2. be able to. Moreover, in the case of the super large diameter of FIG. 8, pile head reinforcement is provided by staggering the pile head reinforcement units 6 in the upper and lower stages and alternately in the circumferential direction with respect to the pile head reinforcement structure 3 shown in FIG. A large number of units 6 can be arranged with good workability, and at the same time, the pile head 2 can be appropriately reinforced in the height direction.

  FIG. 9 shows still another modification of the above embodiment. A large number of stress transmission plate members 5 may be provided on one plate member 4, and in this case, a large number of concave grooves 10 may be formed in accordance with the number of stress transmission plate members 5 as shown in the figure. In the illustrated example, three concave grooves 10 are formed. Thereby, when the strength is insufficient, the number of the stress transmission plate members 5 can be increased, and the pile head 2 can be appropriately reinforced.

  Although not shown, a large number of the plate-like members 4 may be provided on the two stress-transmitting plate members 5 in a pair of upper and lower, and in this case, the extended 12 parts extending from the base 11 are the number of the plate-like members 4. A large number may be formed in accordance with.

  FIG. 10 shows still another modification of the above embodiment. In the above-described embodiment, with respect to the energy absorbing portion 15, the width direction side edge 5 d of the extending portion 12 is formed in an arc shape so as to be narrowed outward in the radial direction of the pile head portion 2. Moreover, you may form in the taper shape which a width dimension narrows to the radial direction outward of the pile head part 2. FIG.

  11 and 12 show still another modification of the above embodiment. 11A is a plan view in the case where an additional pile head reinforcing unit 19 is provided on the side of the inner peripheral surface 2d of the pile head 2, FIG. 7B is a side sectional view thereof, and FIG. It replaces with the pile head reinforcement unit 6 of the outer peripheral surface 2a side of the pile head 2, and the top view at the time of providing the said additional pile head reinforcement unit 19 and FIG. 12 (B) are the sectional side views.

  The additional pile head reinforcement unit 19 of these modified examples is protruded in a vertically vertical posture toward the radially inner side of the pile head 2 on the side of the inner peripheral surface 2d of the pile head 2, 2 and a plurality of plate-like members 4 arranged at appropriate intervals in the circumferential direction, and a joining portion and a plate-like member joined to the pile head 2 in order to join the plate-like material 4 to the pile head 2. 4 having a joint to be joined to the plate 4 and transmitting the stress between the pile head 2 and the plate-like material 4 and the plate-like material 4 penetrating in the plate thickness direction. The plate-like material 4 is provided with a projecting portion 8 provided on the plate-like material 4 so as to project from the plate surface around the through-hole 7 toward the circumferential direction of the pile head 2 and to transmit stress to the plate-like material 4. The joint portion of the plate material 5 is a weld joint w along the concave grooves 10 and 14, the other being fitted into the concave grooves 10 and 14 formed in at least one of the plate material 4 and the stress transmission plate material 5. Structure It is a plate-shaped member 4 and the stress transmitting plate 5 is embedded in the pile head compacting concrete in R which is Da設 inside pile head 2.

  That is, the additional pile head reinforcement unit 19 is the one in which the pile head reinforcement unit 6 of the above embodiment is provided inside the pile head 2.

  In the modification shown in FIG. 11, in the case of a pile head 2 having a large diameter or a super-large diameter, both the space and the work are troublesome due to the arrangement of a large number of pile head reinforcement units 6. The pile head 2 can be efficiently reinforced by the combination of the additional pile head reinforcement unit 19.

  In the modification shown in FIG. 12, when it is difficult to dispose the pile head reinforcement unit 6 around the outside of the pile head 2, the additional pile head reinforcement unit 19 makes the pile head reasonably reasonable. Part 2 can be reinforced.

  Furthermore, if the additional pile head reinforcement unit 19 is provided, the effect of preventing the displacement of the pile head filled concrete R inside the pile head 2 can be secured, and the stress generated in the pile head 2 can be efficiently transmitted. .

  In the said embodiment, although all the protrusion parts 8 of the plate-shaped material 4 protrude in the same direction in the circumferential direction of the pile head 2, there may exist what protrudes in the opposite direction.

DESCRIPTION OF SYMBOLS 2 Pile head 2a Pile head outer peripheral surface 3 Pile head reinforcement structure 4 Plate material 4a Plate surface of plate material 5 Stress transmission plate 6 Pile head reinforcement unit 7 Through-hole 8 Protruding portion 9 Second joint portion 10, 14 Concave groove 13 First joint 15 Energy absorbing part 16 Splitting restraint G Ground Q Foundation concrete w Welded joint along concave groove

Claims (6)

It is a structure to reinforce a pile head that protrudes upward from the ground and is embedded in the foundation concrete,
Plurally arranged at appropriate intervals in the circumferential direction of the pile head by projecting in a vertically vertical posture outwardly in the radial direction of the pile head on the outer peripheral surface side of the pile head Plate-like material,
In order to join the plate material to the pile head, the pile head has a first joint joined to the pile head and a second joint joined to the plate material, A stress transmitting plate that transmits stress to and from the plate,
A through hole formed through the plate-like material in the thickness direction;
The plate-like material is provided with a projecting portion projecting from the plate surface around the through hole toward the circumferential direction of the pile head,
The second joining portion is configured by fitting the other into a concave groove formed in at least one of the plate material and the stress transmission plate material, and welding welding along the concave groove,
The pile head reinforcing structure, wherein the plate material and the stress transmission plate material are embedded in the foundation concrete placed around the pile head.   The pile head reinforcing structure according to claim 1, wherein at least a pair of stress transmitting plate members are provided, and are joined to at least an upper portion and a lower portion of the plate-like member vertically oriented.   The splitting reinforcing bars to which the foundation concrete adheres are arranged in the foundation concrete so as to intersect the protrusions and the through holes on the front and back of the plate surface of the plate-like material. The pile head reinforcement structure of 1 or 2. A pile head reinforcement unit for reinforcing a pile head that is projected upward from the ground and embedded in the foundation concrete,
Plurally arranged at appropriate intervals in the circumferential direction of the pile head by projecting in a vertically vertical posture outwardly in the radial direction of the pile head on the outer peripheral surface side of the pile head Plate-like material,
In order to join the plate material to the pile head, the pile head has a first joint joined to the pile head and a second joint joined to the plate material, A stress transmitting plate that transmits stress to and from the plate,
A through hole formed through the plate-like material in the thickness direction;
The plate-like material is provided with a projecting portion projecting from the plate surface around the through hole toward the circumferential direction of the pile head,
The second joint portion is configured by fitting the other into a concave groove formed in at least one of the plate material and the stress transmission plate material, and configured by welding joining along the concave groove. Pile head reinforcement unit to do.   The pile head reinforcing unit according to claim 4, wherein at least a pair of stress transmitting plate members are provided, and are joined to at least an upper portion and a lower portion of the plate member vertically oriented.   6. The pile head reinforcing unit according to claim 4, wherein the stress transmitting plate member is provided with an energy absorbing portion between the first joint portion and the second joint portion.

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