JP4684850B2 - Pile head structure to absorb pile eccentricity and inclination - Google Patents

Description

  The present invention relates to a pile head structure that absorbs eccentricity and inclination of a pile.

  In the pile head structure where the joint plate part that joins the upper structure part such as the base plate of the column base is provided on the pile head, the eccentricity and inclination of the pile are absorbed and the joint plate part is horizontally placed at a predetermined horizontal position. Two crescent shapes called jastle that absorb the inclination of the pile with spherical bearings and install the eccentricity of the pile in each bolt hole of the joint plate part. Some are absorbed by the ring.

  However, in the pile head structure as described above, it is necessary to determine the size of the bolt hole in the joint plate in consideration of the maximum eccentric dimension of the pile, and the maximum eccentric dimension is actually relatively large. There is a problem that the planar size of the joining plate portion to be used becomes large.

  Further, since there are a plurality of bolt through holes provided in the joining plate portion, it is necessary to install and adjust the jastle for each bolt through hole, and there is a problem that it takes time and effort to absorb the eccentricity.

  In view of the conventional problems as described above, the present invention absorbs the eccentricity and inclination of the pile, which can reduce the planar size of the joining plate portion and can easily absorb the eccentricity of the pile. An object is to provide a pile head structure.

The above problem is a pile head structure in which a joining plate part for joining the upper structure part is provided on the head of the pile, and absorbs eccentricity and inclination of the pile,
A receiving part provided with a spherical recess on the upper surface part is provided on the pile head, and a hump-like part is provided on the lower end part of the leg part suspended from the joint plate part. The lower surface side is formed into a spherical convex corresponding to the spherical recess of the receiving part, and the spherical convex is supported in the spherical concave of the receiving part so that the inclination of the pile is absorbed. Has been made, and
The receiving portion is provided with a spherical recess so that the center of curvature is decentered laterally from the pile core position, and the rotational position of the pile head can be arbitrarily determined. The leg portion is provided at a position deviated laterally from the center of curvature of the spherical convexity of the hump-shaped portion, and adjusts the position of the hump-shaped portion in the rotation direction and the position of the receiving portion in the rotation direction. This is solved by a pile head structure that absorbs the eccentricity and inclination of the pile, characterized in that the eccentricity of the pile is absorbed (first invention).

  In this pile head structure, the inclination of the pile can be absorbed by the spherical bearing of the hump-like part by the receiving part. Also, the eccentricity of the pile is that the spherical recess of the receiving part is eccentric to the side from the pile core position, and the leg part is eccentric to the side from the center of curvature of the spherical convexity of the hump-like part. Absorption can be achieved by adjusting the position of the hump in the rotational direction and the position of the receiving part in the rotational direction.

  And, by adopting a structure that absorbs the eccentricity of the pile in this way, the joining plate portion can be installed in a horizontal position without eccentricity, and a conventional jastring can be eliminated, The size of the bolt hole in the plate portion can be reduced, and the planar size of the joining plate portion can be reduced.

  And since the eccentricity of a pile is absorbed only by adjusting the position in the rotation direction of a hump-shaped part and the position in the rotation direction of a receiving part, the eccentricity of a pile can be absorbed easily.

  Said 1st invention WHEREIN: A receiving part is provided so that height position adjustment is possible with respect to a pile, and it can adjust the height position of a junction board part by adjusting the height position of a receiving part. In the case of being made (second invention), or in the first and second inventions, when the leg portion is provided so that the height position can be adjusted with respect to the hump-like portion (third invention), The height position can be adjusted, and even if there is a vertical shift in the height position of the pile upper end after pile driving, it can be absorbed and the joining plate part can be Can be located.

Further, in the first invention, the joint plate portion is provided with a plurality of bolt holes for joining the upper structure portion, and the joint plate portion and the leg portion are integrated,
The leg portion is screwed to the hump-like portion by the first screw mechanism, and the receiving portion is adapted to be able to adjust the height position to the pile by the second screw mechanism, and The screw pitch of the first screw mechanism may be set smaller than the screw pitch of the second screw mechanism (fourth invention).

  In this case, the displacement of the height position of the pile upper end can be efficiently absorbed by the second screw mechanism having a large screw pitch, and the relationship with the position of the bolt hole on the upper structure portion side by the first screw mechanism. Thus, the direction of the joining plate portion can be changed to bring the bolt through hole into the centered state, and the screw pitch of the first screw mechanism is set smaller than the screw pitch of the second screw mechanism. Even if the orientation of the part is changed, the height position of the joining plate part is not greatly shifted.

  Since the pile head structure of the present invention that absorbs the eccentricity and inclination of the pile is as described above, the plane size of the joint plate portion can be reduced, and the eccentricity of the pile can be easily absorbed. Can do.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  In the pile head structure of the embodiment shown in FIGS. 1 and 2, 1 is a circular steel pipe pile as a pile, 2 is a joining plate portion, the joining plate portion 2 has a square shape in plan view, and each of the four corner portions. Are provided with bolt through holes 2a.

  The cylindrical body 3 is concentrically joined to the upper end of the steel pipe pile 1 by welding W, and the base body 4 is connected to the inner peripheral part on the lower end side of the cylindrical body 3 by a second screw mechanism 5 by screw parts 5a and 5b. The outer peripheral circular receiving body 6 as a receiving portion is fitted onto the base body 4 in a tightly fitted state with respect to the inner peripheral surface of the cylindrical body 3. The upper surface of the receiving body 6 is provided with a hemispherical recess 6a.

  On the other hand, a columnar leg portion 7 is integrally suspended from the center position of the joining plate portion 2, and the lower end side of the leg portion 7 has screws 8 a and 8 b having a screw pitch smaller than the screw pitch in the second screw mechanism 5. The first screw mechanism 8 is rotatably screwed into a hump 9 as a hump, and the hump 9 is formed of a sphere, the lower surface of which corresponds to the spherical recess 6a of the receiver 6. The spherical projection 9a is supported by a spherical surface in the spherical recess 6a of the receiving body so that the inclination of the pile 1 can be absorbed.

  The receiving body 6 is provided so that the spherical recess 6a decenters its center of curvature laterally from the pile core position, and arbitrarily determines the position in the rotational direction inside the cylindrical body 3. Further, the leg portion 7 is provided at a position deviated laterally from the center of curvature of the spherical convex 9a of the hump 9 and the position of the hump 9 in the rotational direction is By adjusting the position of the receiving body 6 in the rotation direction, the eccentricity of the steel pipe pile 1 can be absorbed within the range indicated by the mesh hatching in FIG.

  Reference numeral 10 denotes a retaining fixing means, which is divided into upper and lower annular retaining fixing bodies 10a and 10b, and the lower retaining fixing body 10b is fitted into the cylindrical body 3 so as to be positioned in the rotational direction. A spherical recess 10c fitted to the upper spherical portion 9b of the hump 9 on the lower surface side is provided in an eccentric state, and can be selected arbitrarily. Is screwed into the upper end portion of the cylindrical body 3 and tightened, whereby the lower retaining fixing body 10b and the receiving body 6 sandwich the hump-like body 9 to fix the hump-like body 9, and the hump-like body 9 This prevents the carrier 6 from coming off.

  In the construction, after placing the steel pipe pile 1 on the ground by rotational penetration, the base body 4 is inserted into the cylindrical body 3 welded to the upper end portion of the steel pipe pile 1, and the base body 4 is inserted into the steel pipe. The second screw mechanism 5 is installed at a predetermined depth position in the cylindrical body 3 according to the amount of deviation of the height position of the upper end portion of the pile 1. The cylindrical body 3 may be attached to the pile 1 in advance, or may be attached to the pile after placement.

  Thereafter, the position of the receiving body 6 in the rotational direction is determined according to the direction and size of the eccentricity of the steel pipe pile 1, and the receiving body 6 is inserted into the cylindrical body 3 and placed on the upper surface portion of the base body 4. Note that the position of the receiving body 6 in the rotational direction may be adjusted while the receiving body 6 is inserted into the cylindrical body 3 and placed on the upper surface of the base body 4.

  Next, the hump-like body 9, the upper and lower retaining fixing bodies 10a and 10b, and the joining plate portion 2 with the leg portions 7 are assembled to the pile head. In these assembling, the position of the hump-like body 9 in the rotational direction is determined so as to absorb the eccentricity of the pile 1 according to the direction and size of the eccentricity of the steel pipe pile 1 and screwed into the hump-like body 9. The hoop 9 is oriented so that the legs 7 stand upright and absorb the inclination of the pile 1, and the spherical protrusion 9 a on the lower surface side of the hump 9 receives the spherical recess 6 a on the upper surface of the body 6. To install. By sliding the spherical convex 9a and the spherical concave 6a in a state where the spherical convex 9a on the lower surface side of the hump 9 is fitted in the spherical concave 6a on the upper surface of the body 6. The position and direction of the rotation direction of the hump 9 may be adjusted.

  Then, the upper retaining fixing body 10a is screwed and tightened inward of the cylindrical body 3, and the joint plate portion 2 is rotated in a state in which the knurled body 9 is fixed, and the bolt through hole 2a. It is located at a predetermined position. Since the screw pitch of the first screw mechanism 8 is set to be smaller than the screw pitch of the second screw mechanism 5, even if the leg portion 7 is rotated by the rotation of the joining plate portion 2, the vertical displacement is small. The joining plate portion 2 can be installed at a substantially predetermined height position.

  FIG. 3 (a) shows the case where the height position of the upper end portion of the steel pipe pile 1 driven into the ground is higher than the predetermined height position. FIG. 3 (b) shows the steel pipe pile. FIG. 3 (c) shows a case where the pile 1 is tilted and driven into the ground, and FIG. 3 (c) is a case where the steel pipe pile 1 is eccentric and driven into the ground. Also in this case, it is possible to absorb the deviation, inclination, and eccentricity of the height position, and the joining plate portion 2 can be positioned horizontally at the planned horizontal position at the planned height position.

  Thus, according to said pile head structure, the horizontal direction position without eccentricity is adjusted by adjusting the position in the rotation direction of the hump-like body 9 and the position in the rotation direction of the receiving body 6. It is possible to eliminate the conventional jastle, to reduce the size of the bolt through holes 2a of the joining plate part 2, and to reduce the planar size of the joining plate part 2. can do. Moreover, since the eccentricity of the steel pipe pile 1 can be absorbed simply by adjusting the position in the rotational direction of the hump 9 and the position in the rotational direction of the receiving body 6, the eccentricity of the steel pipe pile 1 is easily absorbed. Can be made.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in this invention, the mechanism part which absorbs the gap | deviation of the height position of the upper end part of a pile may be abbreviate | omitted, and may be provided. When the first screw mechanism unit 8 is provided, the first screw mechanism unit 8 may be omitted, or the second screw mechanism unit 5 may be omitted and the first screw mechanism unit 8 may absorb the deviation of the height position. May be. Moreover, the mechanism part which absorbs the shift | offset | difference of a height position with another mechanism may be provided.

The pile head structure of embodiment is shown, A figure (I) is a cross-sectional front view, A figure (B) is a top view, A figure (C) is a II sectional view taken on the line (D), and (D) is a figure. It is a top view which shows an eccentric absorption area | region. It is a disassembled perspective view of the same pile head structure. Fig. (A) is a cross-sectional front view showing a state where the displacement of the height position of the upper end of the pile is absorbed, Fig. (B) is a cross-sectional front view showing a state where the inclination of the pile is absorbed, and Fig. (C) is absorbing the eccentricity of the pile. FIG.

Explanation of symbols

1 ... Steel pipe pile
2 ... Joining plate portion 2a ... Bolt through hole 5 ... Second screw mechanism 6 ... Receiving body (receiving portion)
6a ... spherical recess 7 ... leg 8 ... first screw mechanism 9 ... hump (hump)
9a ... Spherical convex

Claims (4)

A joint plate part for joining the upper structure part is provided on the head of the pile, and is a pile head structure that absorbs eccentricity and inclination of the pile,
The cylindrical body is joined to the upper end of the pile by welding so as to be concentric with the pile, a base body is installed inside the lower end side of the cylindrical body, and the receiving body is placed on the inside of the cylindrical body. The lower end part of the leg part suspended from the joint plate part , which is placed so as to fit into the peripheral surface and has a spherical recess in the upper surface part of the receiving body the humped portion is provided, said hump portion, the lower surface side have been formed in a spherical convex corresponding to spherical recess in the receiving body, a spherical to spherical recess of the spherical-shaped convex receiving body By being supported, the inclination of the pile is absorbed, and
The receiving body is provided with a spherical recess so that the center of curvature is decentered laterally from the pile core position, and the inner surface of the cylindrical body fits nicely in the cylindrical body. by being mounted on the base body so as to be fitted state has become possible to determine arbitrarily the position in the rotational direction, the legs, the center of curvature of the spherical convex hump portion It is provided at a position eccentric to the side from the position, and the eccentricity of the pile is absorbed by adjusting the position in the rotation direction of the hump and the position in the rotation direction of the receiver. A pile head structure that absorbs the eccentricity and inclination of the pile. The base body is screwed onto the inner peripheral portion of the cylindrical body by a second screw mechanism, and is placed on the base body by adjusting the height position of the base body by the second screw mechanism. The pile head structure for absorbing eccentricity and inclination of the pile according to claim 1, wherein the height position of the receiving body can be adjusted.   The pile head structure which absorbs eccentricity and inclination of a pile according to claim 1 or 2, wherein the leg portion is provided so that the height position can be adjusted with respect to the hump-like portion. A plurality of bolt through holes for joining the upper structure part to the joining plate part are provided, and the joining plate part and the leg part are integrated,
The leg is screwed to the hump by the first screw mechanism,
The base body is screwed onto the inner peripheral portion of the cylindrical body by a second screw mechanism, and is placed on the base body by adjusting the height position of the base body by the second screw mechanism. 2. The pile according to claim 1, wherein the height position of the receiver can be adjusted, and the screw pitch of the first screw mechanism is set smaller than the screw pitch of the second screw mechanism. Pile head structure that absorbs eccentricity and inclination.

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