JP5574366B2 - Pile head joint member and pile head joint structure using the same - Google Patents

Description

  The present invention relates to a pile head joining technique for joining a pile head embedded in soil and a reinforced concrete foundation constructed above the pile head in foundation work of a relatively large concrete structure. .

  When constructing a reinforced concrete foundation above the head of a pile buried in the soil, conventionally, at the construction site, a plurality of anchoring reinforcing bars are welded to the outer periphery of the pile head protruding from the ground, and a formwork is formed around these. After forming the concrete, a method of placing concrete so as to be integrated with the fixing reinforcing bar is adopted. However, it is inefficient to perform the welding work at the construction site, and there is a possibility that poor welding occurs. In recent years, it has become difficult to secure qualified welding technicians. Then, the pile head joining technique which reduced the welding work in a construction site as much as possible is proposed (for example, refer patent documents 1, 2).

Japanese Patent Laid-Open No. 5-187028 JP 2009-13652 A

  The “steel material for pile head connection” described in Patent Document 1 is excellent in that the vertical load of the mounted structure can be reliably transmitted to the pile body. However, when using this “Pile head coupling steel”, it is necessary to provide some locking means so that the multiple “Pile head coupling steel” arranged on the pile head does not shift during construction. Therefore, the construction procedure becomes complicated. In addition, when placing concrete, it is difficult to check the concrete filling state between the leg portion of the “steel for joining pile head” and the inner surface of the pile head, so the workability at the time of placing the concrete is poor.

  The “reinforcement for pile head reinforcement” described in Patent Document 2 is excellent in that a concrete pile buried in the ground and a concrete foundation placed in the ground can be firmly joined. However, since this “reinforcing bar for pile head” has a complicated bar arrangement state, the reinforcement of the reinforcing bar constituting the concrete foundation is complicated, and the arrangement workability is poor. In addition, this “reinforcing bar for pile head” uses a large amount of reinforcing bars and has a high bar arrangement density, which may impede the flow of concrete placed in this part. Limited. For this reason, workability | operativity at the time of concrete placement is also bad.

  The problem to be solved by the present invention is that no welding work is required on the construction site, construction is easy, work efficiency is improved, and a strong pile head joint structure is constructed even for high toughness piles. It is to provide a pile head joining technique that can be performed.

  The pile head joint member of the present invention is a pile head joint member mounted on a pile head protruding from the ground of a pile material buried in the ground, and a cylinder capable of surrounding the outer periphery of the pile head using a reinforcing bar It is characterized by comprising a main body portion formed in a hook shape and a lid for closing the opening end of the pile head.

  With such a configuration, the cylinder head-shaped main body is attached so as to surround the outer periphery of the pile head protruding from the ground, and if the opening end of this pile head is closed with a lid, the pile head joint member is Since it can be attached to the pile head, construction is easy. In addition, since the cylindrical main body is formed in advance using reinforcing bars, welding work at the construction site is unnecessary, and the opening end of the pile head is closed with a lid to the inside of the pile head. This eliminates the need for placing concrete and improves work efficiency. Furthermore, since the outer periphery of the pile head is surrounded by the tubular hook-shaped main body portion formed of reinforcing bars, a strong pile head joint structure can be constructed.

  Here, a ring-shaped or short cylindrical peripheral wall member capable of surrounding the outer periphery of the pile head can be provided in the main body portion. Such a configuration is effective in improving the strength of the main body.

  Moreover, it is desirable to provide holding means for holding the main body mounted on the pile head at a predetermined position substantially coaxial with the pile head. With such a configuration, the positioning operation of the main body can be easily and accurately performed, which is effective in improving work efficiency and stabilizing construction quality.

  In this case, as the holding means, a holding member that engages with the open end of the pile head can be provided in the main body. With such a configuration, by engaging the holding member with the opening end of the pile head, the main body portion can be held at a predetermined position substantially coaxial with the pile head. improves.

  Moreover, if it is such a structure which can integrate the said cover body with the said main-body part, it will become possible to obstruct | occlude the opening end of a pile head with a cover body by attaching a main-body part to a pile head. Therefore, work efficiency is improved. Moreover, since the integrity of the main body portion and the pile head can be enhanced via the lid, it is effective for improving the strength of the pile head joint structure.

  On the other hand, a reinforcing portion formed integrally with the main body portion using a reinforcing bar can be provided so as to form a shape surrounding the outer periphery on the lower end side of the main body portion. With such a configuration, the outer periphery on the lower end side of the main body that surrounds the outer periphery of the pile head is further surrounded by the reinforcing portion, and the amount of effective reinforcing bars arranged around the pile head increases. The strength of the head joint structure is further improved.

  Next, the pile head joint structure of the present invention attaches the main body portion of any of the above pile head joint members in a state surrounding the outer periphery of the pile head protruding from the ground, and the opening end of the pile head is It is characterized by being closed with a lid.

  With such a configuration, welding work at a construction site is not required, construction is easy, work efficiency is improved, and a strong pile head joint structure can be constructed even for a tough pile.

  Here, it is desirable to provide a locking means for preventing the main body from being detached to the opening end side of the pile head. With such a configuration, when an external force is applied, the main body portion is difficult to separate from the opening end side of the pile head, which is effective for improving the strength of the pile head joint structure.

  In this case, as the locking means, an enlarged diameter portion where the main body portion cannot be detached can be provided on the opening end side of the pile head. With such a configuration, it is possible to obtain a reliable detachment preventing action while having a simple structure.

  Moreover, the said cover body which has the outer diameter which the said main-body part cannot remove | separate can also be fixed to the opening end of the said pile head as said latching means. If it is set as such a structure, the reliable detachment | desorption prevention effect | action can be obtained using the cover body which makes a part of the said pile head joining member.

  The present invention provides a pile head joining technique that does not require welding work at a construction site, is easy to construct, improves work efficiency, and can build a strong pile head joint structure even for high tough piles. be able to.

It is a top view which shows the pile head joining member which is 1st Embodiment of this invention. It is a front view of the pile head joining member shown in FIG. It is a partially notched front view which shows the pile head joining structure which uses the pile head joining member shown in FIG. It is a partially notched front view which shows the construction process of the pile head junction structure which uses the pile head junction member which is 2nd Embodiment of this invention. It is a partially notched front view which shows the pile head joining structure formed through the construction process shown in FIG. It is a partially notched front view which shows the other pile head joining structure which uses the pile head joining member which is 3rd Embodiment of this invention. It is a partially notched front view which shows the pile head joining structure which uses the pile head joining member which is 4th Embodiment of this invention. It is a partially notched front view which shows the pile head joining structure which uses the pile head joining member which is 5th Embodiment of this invention. It is a partially notched front view which shows the pile head joining structure which uses the pile head joining member which is 6th Embodiment of this invention. It is a top view which shows the pile head joining member which is 7th Embodiment of this invention. It is a front view of the pile head joining member shown in FIG. It is a front view which shows the pile head joining structure which uses the pile head joining member shown in FIG. It is a partially notched front view which shows the pile head joining structure which uses the pile head joining member which is 8th Embodiment of this invention. It is a partially notched front view which shows the pile head joining structure which uses the pile head joining member which is 9th Embodiment of this invention.

  The pile head joining member 10 which is 1st Embodiment of this invention and a pile head joining structure using the same are demonstrated based on FIGS. 1-3. As shown in FIGS. 1 to 3, the pile head joining member 10 is attached to a pile head 100 a protruding from the surface of the discarded concrete C placed on the ground Gf of the pile material 100 embedded in the underground Gi. The main body part 11 which is a member and is formed into a cylindrical shape capable of surrounding the outer periphery of the pile head 100a by combining and welding a plurality of vertical reinforcing bars 10v and hoop reinforcing bars 10h, and the open end 100b of the pile head 100a And a disk-shaped lid body 12 to be closed. The lid 12 is integrated with the vertical reinforcing bar 10v on the inner periphery of the main body 11 by welding. Further, a reinforcing portion 13 is provided integrally with the main body portion 11 so as to form a shape surrounding the outer periphery on the lower end side of the main body portion 11.

  As shown in FIGS. 1 and 2, the six vertical reinforcing bars 10v forming the main body portion 11 are formed along the axis 11c along a virtual cylindrical surface (not shown) coaxial with the axis 11c of the main body portion 11. Four hoop reinforcing bars 10h in a ring shape are arranged at equal intervals along the axis 11c in a state of being arranged in parallel and spaced at an interval of 60 degrees and surrounding the outer periphery of the vertical reinforcing bars 10v. The lower ends of the six vertical reinforcing bars 10v are bent in a J shape so as to expand in the radial direction about the axis 11c, and the inner diameter of the hoop reinforcing bar 10h is smaller than the hoop reinforcing bar 10h. The reinforcing part 13 is integrally formed with the main body part 11 by arranging two large hoop reinforcing bars 10H along the direction of the axis 11c.

  The disc-shaped lid 12 is fixed to the inner periphery of the main body 11 in a posture orthogonal to the axis 11c between the hoop rebar 10h located at the lowermost part in the direction of the axis 11c and the reinforcing part 13. . Note that the number and arrangement interval of the vertical reinforcing bars 10v and the hoop reinforcing bars 10h and 10H, the arrangement location of the lid 12 in the direction of the axis 11c, and the like are not limited to those described above, and can be changed according to the construction conditions.

  When the pile head joining member 10 is used, as shown in FIG. 3, the tubular body 11 is attached in a state surrounding the outer periphery of the pile head 100 a protruding from the surface of the discarded concrete C. If the opening end 100b of 100a is closed with the lid body 12, the pile head joining member 10 is mounted on the pile head 100a, so that the construction is easy. Moreover, in the pile head joining member 10, the cover body 12 fixed to the inner periphery of the main body portion 11 holds the main body portion 11 attached to the pile head 100a at a predetermined position substantially coaxial with the pile head 100a. Since it functions as a holding means, the main body 11 can be positioned easily and accurately, which is effective for improving work efficiency and stabilizing construction quality.

  Since the tubular hook-shaped main body part 11 and the reinforcing part 13 are previously formed by welding using the vertical reinforcing bars 10v and the hoop bars 10h, 10H, welding work at the construction site is unnecessary, and the pile head 100a Since the opening end 100b is closed by the lid body 12, it is not necessary to place concrete inside the pile head 100a, so that the work efficiency of the pile head joining work is improved. Furthermore, since the outer periphery of the pile head 100a is surrounded by the main body 11 of the cylindrical hook shape formed by the vertical reinforcing bars 10v and the hoop bars 10h, 10H, a strong pile head joint structure is constructed even for high toughness piles. can do. In addition, instead of the plurality of hoop bars 10h, a tubular hook-shaped main body can be formed by welding reinforcing bars around the vertical bars 10v in a spiral shape.

  In the pile head joining member 10, by integrating the lid body 12 with the main body portion 11, the main body portion 11 is attached to the pile head 100 a and the opening end 100 b of the pile head 100 a is closed with the lid body 12. Therefore, work efficiency is improved. Moreover, since the integrity of the main-body part 11 and the pile head 100a can be improved via the cover body 12, it is effective for the strength improvement of a pile head junction structure.

  On the other hand, by providing the reinforcing portion 13 integrated with the main body portion 11 so as to form a shape surrounding the outer periphery of the lower end side of the main body portion 11, the outer periphery of the lower end side of the main body portion 11 surrounding the outer periphery of the pile head 100a is reduced. Furthermore, it will be in the state enclosed by the reinforcement part 13, and since the amount of effective reinforcing bars arranged around the pile head 100a increases, the intensity | strength of a pile head junction structure can further be improved.

  Next, based on FIG. 4, FIG. 5, the pile head joining member 20 which is 2nd Embodiment of this invention and the pile head joining structure using this are demonstrated. The pile head joining member 20 is a member attached to the pile head 100a protruding from the surface of the discarded concrete C, and can surround the outer periphery of the pile head 100a by welding a plurality of vertical reinforcing bars 10v and hoop reinforcing bars 10h. A main body part 21 formed in a cylindrical shape, a reinforcing part 23 formed integrally with the main body part 21 so as to surround the outer periphery of the lower end side of the main body part 21, and a disc shape independent of the main body part 21 And a short cylindrical peripheral wall member 24 is welded to the lower end of the inner periphery of the main body 21 so as to be coaxial with the axis 21c of the main body 21.

  The lower end portions of the plurality of vertical reinforcing bars 10v are bent in a J shape so as to expand in the radial direction around the center of the axis 21c, and the inner diameter 2 is larger than the hoop reinforcing bar 10h in a state of surrounding the periphery of the J-shaped portion 10j. The reinforcing portion 23 is formed integrally with the main body portion 21 by arranging the hoop reinforcing bars 10H along the axis 21c.

  On the outer periphery of the disc-shaped lid body 22, a conical surface 22 a having a diameter continuously reduced toward one surface (lower surface) of the lid body 22 is formed. The outer diameter of the lower surface of the lid body 22 (the reduced diameter portion of the conical surface 22a) is equal to or smaller than the inner diameter of the opening end 100b of the pile head 100a, and the outer diameter of the upper surface of the lid body is larger than the inner diameter of the opening end 100b.

  As shown in FIG. 4, in the pile material 100 to which the pile head joining member 20 is attached, a plurality of slits 100 s are opened from the opening end 100 c of the pile head 100 a along the axis 100 c direction of the pile material 100. Has been. The plurality of slits 100s are opened at equal intervals around the axis 100c, but the number and arrangement interval are not limited.

  As shown in FIG. 4, after attaching the outer periphery of the pile head 100a protruding from the surface of the discarded concrete C to a state in which the outer periphery of the pile head body 21 and the short cylindrical peripheral wall member 24 are surrounded, the lid body 22 is The lower surface side (the diameter-reduced portion side of the conical surface 22a) is fitted into the opening end 100b with the posture toward the opening end 100b of the pile head 100a, and the lid 22 is pivoted while keeping the posture orthogonal to the axis 100c. When pushed in the direction of the center 100c, as shown in FIG. 5, the wedge action of the conical surface 22a with respect to the inner peripheral surface of the opening end 100b causes the plurality of slits 100s to expand, and the opening end 100b deforms to expand in diameter. The body 22 is inserted into the pile head 100a from the open end 100b.

  Accordingly, the opening end 100b is closed by the lid body 22, and the enlarged end portion 100w having an outer diameter larger than the inner diameter of the peripheral wall member 24 of the pile head joining member 20 is formed at the opening end 100b. The main body 21 of the member 20 cannot be detached from the pile head 100a. Further, the shaft center 21 c of the main body portion 21 is mounted in a state where it substantially coincides with the shaft center 100 c of the pile material 100.

  In the pile head joining member 20, the short cylindrical peripheral wall member 24 that can surround the outer periphery of the pile head 100 a is provided on the lower end side of the main body portion 21, which is effective in improving the strength of the main body portion 21. In this case, if the inner diameter of the peripheral wall member 24 is set to a dimension close to the outer diameter of the pile head 100a, when the pile head joining member 20 is mounted on the pile head 100a, the axis 21c of the main body 21 and the pile material 100 The degree of coincidence with the shaft center 100c is increased, and play between the pile head joining member 20 and the pile material 100 can be reduced.

  In the present embodiment, as a locking means for preventing the main body portion 21 of the pile head joining member 20 from being detached to the opening end 100b side of the pile head 100a, the enlarged diameter portion from which the main body portion 21 cannot be detached to the opening end 100b side. Since 100w is formed, a reliable detachment preventing action can be obtained with a simple structure. Further, when an external force is applied after the construction, the main body portion 21 is difficult to be detached from the open end 100b side of the pile head 100a, which is effective in improving the strength of the pile head joint structure.

  Next, based on FIG. 6, the pile head joining member 30 which is 3rd Embodiment of this invention and the pile head joining structure using this are demonstrated. As shown in FIG. 6, the pile head joining member 30 is a member attached to the pile head 101a of the upper pile 101 protruding from the surface of the discarded concrete C. The upper pile 101 is a member having the same diameter as that of the pile material 100, and by joining the upper end of the pile material 100 embedded in the underground Gi and the lower end of the upper pile 101 via the welded joint portion W, The pile material 100 and the upper pile 101 have an integral structure in a state in which the respective shaft centers 100c and 101c coincide with each other. The pile head joining member 30 includes a main body 31 formed in a cylindrical shape capable of surrounding the outer periphery of the pile head 101a by combining and welding a plurality of vertical reinforcing bars 10v and hoop reinforcing bars 10h, and a lower end side of the main body 31 A reinforcing portion 33 formed integrally with the main body portion 31 so as to surround the outer periphery of the main body portion 31 and a disc-shaped lid body 32 independent of the main body portion 31. A short cylindrical peripheral wall member 34 is welded coaxially with the axis 31 c of the main body 31.

  The inner diameter is larger than that of the hoop reinforcing bar 10h in a state of surrounding the periphery of the J-shaped part 10j formed by bending the lower ends of the plurality of vertical reinforcing bars 10v in a J-shape so as to spread radially around the center of the axis 31c. The reinforcing portion 33 is formed integrally with the main body portion 31 by arranging the two hoop reinforcing bars 10H along the direction of the axis 31c. It should be noted that the number of hoop reinforcing bars 10h and 10H, the arrangement interval, and the like are not limited to the embodiment shown in FIG.

  The lid body 32 is a disk-like member placed on the opening end 101b of the pile head 101a, and a through hole 32c is opened at the center thereof. The outer diameter of the lid 32 is larger than the outer diameter of the opening end 101 b and the inner diameter of the peripheral wall member 34, and smaller than the inner periphery of the main body 31. A plurality of ribs 38 are fixed in a radial pattern around the through hole 32c in a region on the outer peripheral side of the washer 32a disposed on the upper surface of the lid 32.

  On the other hand, a disk-like fixing member 101d is arranged coaxially with the axis 101c of the upper pile 101 at a portion near the lower end in the upper pile 101 joined to the pile material 100 embedded in the underground Gi. The outer periphery of the fixing member 101d and the inner peripheral surface of the upper pile 101 are welded. A through hole 101e is formed in the center of the fixing member 101d, and a disc-like washer 101g and a nut 101f having a female screw portion are fixed to the lower surface of the fixing member 101d in a coaxial state with the through hole 101e.

  As shown in FIG. 6, after attaching the outer periphery of the pile head 101 a to a state in which the outer periphery of the pile head 101 a is surrounded by the cylindrical body portion 31 and the short cylindrical peripheral wall member 34, the lid 32 is attached to the surface (the rib 38 is fixed). If the cover body 32 is attached to the opening end 101b of the pile head 101a with the surface facing upward, the lid 32 closes the opening end 101b. Thereafter, the male screw member 35 is inserted from the through hole 32c of the lid 32 toward the through hole 101e of the fixing member 101d in the upper pile 101, and the lower end portion thereof is screwed to the nut 101f on the lower surface of the fixing member 101d. If the nut 36 is screwed and tightened to the upper end portion of the male screw member 35 protruding from the through hole 32c of the lid body 32, the lid body 32 is fixed to the open end 101b of the pile head 101a.

  As described above, since the outer periphery of the lid body 32 is larger than the outer diameter of the pile head 101a and the inner diameter of the peripheral wall member 34, the lid body 32 is fixed by fixing the lid body 32 to the opening end 101b of the pile head 101a. The outer periphery of the pile head 101a protrudes in a flange shape from the outer periphery of the pile head 101a, and the main body 31 is mounted in a state where it cannot be detached from the pile head 101a.

  Since the fixing procedure of the lid 32 is not limited to the above-described method, for example, a method of attaching the male screw member 35 in the upper pile 101 before attaching the lid 32 to the opening end 101b of the pile head 101a. It can also be taken. That is, the male screw member 35 is inserted from the opening end 101b of the pile head 101a in the opened state before the lid 32 is mounted toward the through hole 101e of the fixing member 101d in the upper pile 101, and the lower end portion is fixed to the lower surface of the fixing member 101d. The upper end portion of the male screw member 35 is protruded from the open end 101b by being screwed to the nut 101f, and then the lid 32 is attached to the male screw member 35 protruding from the open end 101b and tightened with the nut 36. A method can also be taken.

  In this embodiment, as a locking means for preventing the main body 31 from being detached from the opening end 101b side of the pile head 101a, the lid 32 having an outer diameter that the main body 31 cannot be detached is used as the opening end of the pile head 101a. Since it fixes to 101b, the reliable detachment | desorption prevention effect | action can be obtained using the cover body 32 which comprises the pile head joining member 30. FIG.

  Next, based on FIG. 7, the pile head joining member 40 which is 4th Embodiment of this invention and the pile head joining structure using this are demonstrated. In FIG. 7, the parts denoted by the same reference numerals as those in FIG. 6 are the parts having the same shape and function as the constituent parts of the pile head joining member 30, and the description thereof is omitted.

  As shown in FIG. 7, the pile head joining member 40 is a member attached to the pile head 101a protruding from the surface of the discarded concrete C, and is piled by welding a plurality of vertical reinforcing bars 10v and hoop reinforcing bars 10h in combination. A main body 41 formed in a cylindrical shape capable of surrounding the outer periphery of the head 101a, and a disc-shaped lid 32 independent of the main body 41; A cylindrical peripheral wall member 34 is welded so as to be coaxial with the axis 41 c of the main body 41.

  The main body portion 41 constituting the pile head joint member 40 deletes the reinforcing portion 33 from the main body portion 31 of the pile head joint member 30 shown in FIG. 6, deletes the rib 38 on the upper surface of the lid 32, and the outer periphery of the peripheral wall member 34. Since it has a simple structure in which a plurality of hoop reinforcing bars 10h are welded to the outer periphery of the vertical reinforcing bar 10v positioned at the position, it is possible to reduce the amount of reinforcing bars used while ensuring the necessary strength.

  Next, a pile head joint member 50 according to a fifth embodiment of the present invention and a pile head joint structure using the same will be described with reference to FIG. As shown in FIG. 8, the pile head joining member 50 is a member attached to the pile head 100a protruding from the surface of the discarded concrete C, and is piled by welding a plurality of vertical reinforcing bars 10v and hoop reinforcing bars 10h in combination. A main body 51 formed in a cylindrical shape capable of surrounding the outer periphery of the head 100a, a reinforcing portion 53 formed integrally with the main body 51 so as to surround the outer periphery on the lower end side of the main body 51, and a main body 51, a disc-shaped lid 52a fixed coaxially with the axis 51c of the shaft 51, and the main body 51 mounted on the pile head 100a is substantially coaxial with the axis 100c of the pile head 100a. As holding means for holding in a predetermined position, a plurality of holding members 54 having an inverted U shape are provided near the lower end of the inner periphery of the main body 51.

  The plurality of holding members 54 are radially arranged around the axis 51c at regular intervals along the inner periphery near the lower end of the main body 51, and the waist 54d constituting the upper part of each holding member 54 is a lid. It is fixed to the lid 52a in a state of penetrating 52a in the direction of the axis 51c. The main body 51 is held at a predetermined position of the pile head 100a by fitting the peripheral wall 100g of the opening end 100b of the pile head 100a into the slit 54a between the pair of leg portions 54b, 54c constituting each holding member 54. The A disc-shaped lid 52b is fixed to the lower end of the leg portion 54c of each holding member 54 located in the pile head 100a in a coaxial state with the shaft center 51c.

  As shown in FIG. 8, in the pile head joining member 50, since the main body part 51 is provided with a plurality of holding members 54 that engage with the open end 100b of the pile head 100a, the slits 54a of these holding members 54 are provided. By engaging each with the peripheral wall 100g of the opening end 100b of the pile head 100a, the main body 51 can be held at a predetermined position substantially coaxial with the axis 100c of the pile head 100a, and workability is improved. . The upper ends of the plurality of waist portions 54d that protrude radially from the upper surface of the lid 52a around the axis 51c exhibit a rib-like reinforcing function, and the lower ends of the leg portions 54c of the holding member 54 have a disk shape. Since the lid body 52b is fixed coaxially with the shaft center 51c, a strong pile head joint structure can be constructed.

  Next, based on FIG. 9, the pile head joining member 60 which is 6th Embodiment of this invention, and the pile head joining structure using this are demonstrated. In FIG. 9, the parts denoted by the same reference numerals as those in FIG. 8 are the parts having the same shape and function as the constituent parts of the pile head joining member 50, and the description thereof is omitted.

  As shown in FIG. 9, the pile head joining member 60 is a member attached to the pile head 100a protruding from the surface of the discarded concrete C, and is piled by welding a plurality of vertical reinforcing bars 10v and hoop reinforcing bars 10h in combination. A main body 61 formed in a cylindrical shape capable of surrounding the outer periphery of the head 100a, and a disc-shaped lid 52a fixed in the main body 61 so as to be coaxial with the axis 61c; A plurality of inverted U-shaped holding members 54 are provided near the lower end of the inner periphery of the main body 61. Further, a disc-shaped lid 52b is fixed to the lower end of the leg portion 54c of the holding member 54 so as to be coaxial with the axis 61c.

  The main body portion 61 constituting the pile head joining member 60 is formed by deleting the reinforcing portion 53 from the main body portion 51 of the pile head joining member 50 shown in FIG. Since this hoop rebar 10h has a simple structure, it is possible to reduce the amount of rebar used while ensuring the required strength.

  Next, based on FIGS. 10-12, the pile head joining member 70 which is 7th Embodiment of this invention, and the pile head connection structure using this are demonstrated. As shown in FIGS. 10 to 12, the pile head joining member 70 is attached to a pile head 100 a protruding from the surface of the discarded concrete C placed on the ground Gf of the pile material 100 embedded in the underground Gi. A main body 71 formed in a cylindrical shape capable of surrounding the outer periphery of the pile head 100a by welding a combination of a plurality of vertical reinforcing bars 10w and hoop reinforcing bars 10h, and an open end 100b of the pile head 100a And a disc-shaped lid 72 that is closed. The lid 72 is integrated with the vertical reinforcing bars 10w on the inner periphery of the main body 71 by welding, and a short cylindrical peripheral wall member 74 is coaxial with the axis 71c of the main body 71 at the lower end of the inner periphery of the main body 71. It is welded as it is.

  A disc-shaped head 10t having a diameter larger than the outer diameter of the vertical reinforcing bar 10w is formed at the upper ends of the plurality of vertical reinforcing bars 10w constituting the main body 71. A plurality of reinforcing bars 10 x having the same head 10 t as the head 10 t are provided so as to protrude from the outer peripheral surface of the peripheral wall member 74. These reinforcing bars 10x project radially from the axis 71c of the main body 71. The number of rebars 10x with the head 10t projecting from the outer periphery of the peripheral wall member 74 and the projecting positions are not limited to the forms shown in FIGS.

  When using the pile head joining member 70, as shown in FIG. 12, when the main body 71 is attached to the pile head 100a with the pile head 100a passing through the short cylindrical peripheral wall member 74, the outer periphery of the pile head 100a Is surrounded by the peripheral wall member 74 and the main body 71, and the open end 100 b of the pile head 100 a is closed by the lid 72.

  In the pile head joining member 70, the main body portion 71 is configured by using a plurality of vertical reinforcing bars 10 w having a head 10 t at the upper end, and a plurality of reinforcing bars 10 x having a head 10 t are provided on the outer periphery of the peripheral wall member 74. ing. Therefore, when concrete is placed around the pile head joint member 70 attached to the pile head 100a, each head 10t exhibits an anchor function, which is effective in improving the strength of the pile head joint structure. In addition, since the head 10t of the vertical reinforcing bar 10w constituting the main body 71 has an anchor function, it is possible to ensure the adhesion strength after placing the concrete even if the vertical reinforcing bar 10w is relatively short. The fixing length L shown in FIG. 12 can be shortened.

  Next, based on FIGS. 13 and 14, the pile head joining members 80 and 90 according to the eighth and ninth embodiments of the present invention will be described. In addition, in FIG.13, FIG.14, the part which has attached | subjected the code | symbol same as the code | symbol in FIG.4-7 FIG.7 or FIG.10-12 is the same shape as the component part of the pile head joining member 20,30,40,70. This is a part having a function, and a description thereof will be omitted.

  A pile head joining member 80 shown in FIG. 13 includes a main body portion 81 having a structure in which the lid body 72 is deleted from the main body portion 71 of the pile head joining member 70 shown in FIGS. 10 and 11, and an independent lid body 22. ing. When using the pile head joining member 80, as shown in FIG. 13, after attaching the main body part 81 so that the circumference of the pile head 100a is surrounded by the cylindrical main body part 81 and the peripheral wall member 74, the pile head 100a The lid 22 is press-fitted into the open end 100b of the.

  Accordingly, the opening end 100b is closed by the lid body 22, and the enlarged end portion 100w having an outer diameter larger than the inner diameter of the peripheral wall member 74 of the pile head joining member 80 is formed at the opening end 100b. The main body 81 of the member 80 cannot be detached from the pile head 100a. In addition, the shaft center 81 c of the main body portion 81 is mounted so as to substantially coincide with the shaft center 100 c of the pile material 100.

  A pile head joining member 90 shown in FIG. 14 includes a main body 91 having a structure in which the lid 72 is removed from the main body 71 of the pile head joining member 70 shown in FIGS. 10 and 11, and an independent lid 32. ing. The lid body 32 is a disk-like member placed on the opening end 101b of the pile head 101a, and a through hole 32c is opened at the center thereof. The outer diameter of the lid 32 is larger than the outer diameter of the opening end 101 b and the inner diameter of the peripheral wall member 74 and smaller than the inner periphery of the main body portion 91. A plurality of ribs 32a are radially fixed around the through hole 32c in a region on the outer peripheral side of the washer 32a disposed on the upper surface of the lid 32.

  When the pile head joining structure 90 is used, as shown in FIG. 14, the periphery of the pile head 101 a of the upper pile 101 joined to the upper end of the pile material 100 via a welded joint W is formed in a tubular body shape 91. And after attaching the main-body part 91 so that it may be enclosed by the surrounding wall member 74, the cover body 32 is set to the opening end 101b of the pile head 101a in the state which turned the surface (surface to which the some rib 38 was fixed) upwards. If placed, the open end 101b is closed by the lid 32.

  Thereafter, the male screw member 35 is inserted from the through hole 32c of the lid 32 toward the through hole 101e of the fixing member 101d in the upper pile 101, and the lower end portion thereof is attached to the nut 101f fixed to the lower surface of the fixing member 101d. If the nut 36 is screwed and tightened to the upper end portion of the male screw member 35 protruding from the through hole 32c of the lid 32, the lid 32 is fixed to the open end 101b of the pile head 101a. In addition, by screwing the lower end portion of the male screw member 35 to the nut 101f on the lower surface of the fixing member 101d in advance, the upper end portion of the male screw member 35 is projected from the open end 101b of the pile head 101a, and the lid 32 and the nut 36 can be screwed together.

  Since the outer periphery of the lid 32 is larger than the outer diameter of the pile head 101a and the inner diameter of the peripheral wall member 74, the outer periphery of the lid 32 is fixed to the pile head by fixing the lid 32 to the open end 101b of the pile head 101a. Since it will be in the state which protruded from the outer periphery of 101a to the flange shape, the main-body part 91 is mounted | worn in the state which cannot detach | leave from the pile head 101a.

  The pile head joint member and the pile head joint structure according to the present invention can be widely used in foundation work of reinforced concrete structures such as office buildings, large commercial facilities, or public buildings.

10, 20, 30, 40, 50, 60, 70, 80, 90 Pile head joint member 10j J-shaped part 10t Head 10v, 10w Vertical reinforcing bar 10h, 10H Hoop reinforcing bar 10x Reinforcing bar 11, 21, 31, 41, 51 , 61, 71, 81, 91 Body 11c, 21c, 31c, 41c, 51c, 61c, 71c, 81c, 91c, 100c, 101c Axes 12, 22, 32, 52a, 52b, 72 Lid 13, 23, 33 Reinforcement part 22a Conical surface 24, 34, 74 Peripheral wall member 32a, 101g Washer 32c, 101e Through hole 35 Male thread member 36, 101f Nut 38 Rib 54 Holding member 54a Slit 54b, 54c Leg part 54d Waist part 100 Pile material 100a, 101a Pile Head 100b, 101b Open end 100g Perimeter wall 100s Slit 101 Upper pile 10 d fixing member C discarded concrete Gi underground Gf ground L fixing length W welded joint portion

Claims (5)

A pile head joint member mounted on a pile head protruding from the ground of a pile material buried in the ground, and using a plurality of vertical rebars and hoop rebars, the outer shape of the pile head can be surrounded by a cylindrical shape The main body portion formed integrally with the main body portion using a reinforcing bar so as to form a shape that surrounds the outer periphery of the lower end side of the main body portion, a lid that closes the opening end of the pile head. A reinforcing portion,
The lower ends of the plurality of vertical reinforcing bars are bent in a J shape so as to expand in the radial direction about the axis of the pile head, and have a larger inner diameter than the hoop reinforcing bar so as to surround the periphery of the J shape. The pile head joining member, wherein the reinforcing portion is formed integrally with the main body portion by arranging a plurality of hoop reinforcing bars along the direction of the axis. A pile head joint member mounted on a pile head protruding from the ground of a pile material buried in the ground, and using a plurality of vertical rebars and hoop rebars, the outer shape of the pile head can be surrounded by a cylindrical shape A formed main body, and a lid for closing the open end of the pile head independently of the main body,
A ring-shaped or short cylindrical peripheral wall member capable of enclosing the outer periphery of the pile head is provided in the main body, and the lower ends of the plurality of vertical reinforcing bars are spread in a radial direction around the axis of the pile head. A reinforcing portion integrated with the main body portion by bending a plurality of hoop rebars having a larger inner diameter than the hoop rebar in a state of being bent in a J shape and surrounding the periphery of the J shape. Pile head joint member characterized by forming .   As the holding means for holding the main body portion mounted on the pile head at a predetermined position substantially coaxial with the pile head, the lid body that engages with the opening end of the pile head is integrated with the main body portion. The pile head joint member according to claim 1, wherein the pile head joint member is provided. The main body part of the pile head joint member according to claim 2 is attached in a state surrounding the outer periphery of the pile head protruding from the ground, the opening end of the pile head is closed with the lid, and the main body part is the pile. A locking means for preventing the head from being detached is provided on the opening end side of the head, and as the locking means, an enlarged diameter portion on which the main body portion cannot be detached is provided on the opening end side of the pile head. Pile head joint structure. The pile head joint structure according to claim 4 , wherein, as the locking means, the lid body having an outer diameter from which the main body portion cannot be detached is fixed to an opening end of the pile head.

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