JP2014169547A - Pile head structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile head structure in which the degree of adhesion of a lid body to a pile head is improved through easy work.SOLUTION: A fixing bolt 10 is screwed to a bolt fitting part 6, a shaft part 10a of the fixing bolt 10 extends in a substantially horizontal plane and has its tip pressed against an inner wall face 1c of a pile head 1A. When an axis passing through the center of the shaft part 10 is defined as a reference axis L in a state in which the shaft part 10a of the bolt 10 is orthogonal to the inner wall face 1c of the pile head 1A, a center axis P of the bolt 10 screwed to the bolt fitting part 6 is inclined to the reference axis L around a center point O of a female screw part 6a in a horizontal plane by an angle α, which is larger than 0° and equal to or smaller than 60°, clockwise when the bolt is a right-hand screw and counterclockwise when a left-hand screw. When a head part 10b of the bolt 10 is rotated toward a C direction so as to fasten the bolt 10, the tip of the shaft part 10a of the bolt 10 is to shift as shown by B. Consequently, the lid body can be pressed tightly against an upper end of the pile head 1A.

Description

  The present invention relates to a technique for closing an upper end opening of a pile head with a lid.

  Conventionally, as a technique in such a field, there is Japanese Patent No. 3647841. In the joint structure between the pile and the upper structure described in this publication, a disk-shaped adjustment plate (lid) fixed by welding in the upper end opening of the pile head is used. A long hole extending in the radial direction from the center is formed in the adjustment plate, and a central bolt is passed through the long hole. A cover cap for holding the center bolt is disposed on the back surface of the adjustment plate, and this cover cap prevents the center bolt from falling into the pile head from the long hole. Also, the center bolt is inserted from below into the center hole formed in the pile head plate, and the adjustment plate and the pile head plate are sandwiched between the shaft portion of the center bolt in cooperation with the head of the center bolt. The adjusting nut is screwed. And the pile head plate fixed to the pile head and the base plate of the column base which makes a part of upper structure are fastened by the connection bolt.

Japanese Patent No. 3647841 Japanese Patent No. 4492146

  However, in the conventional pile head structure described above, the upper end opening of the pile head is closed by the adjustment plate. However, since this adjustment plate is fixed to the pile head by welding, workability is poor. In addition, when a load is applied to the adjustment plate from above, the load must be received by welding. This results in poor adhesion between the adjustment plate and the pile head due to poor welding. There was a risk of impairing the yield strength.

  An object of this invention is to provide the pile head structure which improved the contact | adherence degree of the cover body with respect to a pile head by simple operation | work.

The present invention is a pile head structure in which a lid is fixed to a pile head of a hollow pile erected on the ground,
A bolt mounting portion projecting downward from the lower surface of the lid placed on the upper end of the pile head;
A bolt that is screwed onto the female thread portion of the bolt mounting portion, the shaft portion extends in a substantially horizontal direction, and the tip of the shaft portion is pressed against the inner wall surface of the pile head,
When the axis passing through the center of the shaft part in the state where the shaft part of the bolt extends perpendicularly to the inner wall surface of the pile head is used as the reference axis line,
The central axis of the bolt screwed to the bolt mounting portion is centered on the central point of the female screw portion, and the bolt is an angle α of 0 ° <α ≦ 60 ° in the horizontal plane with respect to the reference axis. When the bolt is a left-hand thread, it is tilted clockwise.

  In this pile head structure, if the bolt head is turned right and the bolt head is turned to the right, the bolt head is turned to the bolt head when the bolt head is turned. Since the left side of the tip of the shaft part is in contact with the inner wall surface of the pile head, the tip of the shaft part of the bolt tends to move downward or to the lower right. By such movement of the tip of the shaft portion of the bolt, a force that strongly presses the lid against the upper end of the pile head can be generated. As a result of the lid being placed on the upper end of the pile head, the load applied to the lid from above can be reliably transmitted to the pile head. And since this cover body can be stuck closely to the upper end of a pile head, the situation where a cover body rotates in a horizontal surface at the upper end of a pile head, or a cover body floats can be avoided. Usually, a foundation is made of concrete on the top of the pile head cover, and a column of the superstructure is installed on the foundation. Moreover, like patent document 2, concrete is filled between the cover body on a pile head, a sheath pipe, and a top plate, and an upper structure may be installed on it. Moreover, like patent document 1, an upper structure may be installed via the steel material on the cover body of a pile head. When a load is applied to the lid body from above with the lid body floating, the load cannot be transmitted from the lid body to the pile. In addition, when a load is applied to the lid body from above while the lid body is floating, the lid body comes into close contact with the upper end of the pile head at that time, and the lid body is displaced. Therefore, when the above-described invention is adopted, the lid can be reliably prevented from being lifted by a simple operation when the lid is fixed to the pile head with a bolt.

The lid is placed on the upper end of the pile head, and is detachable from the lid main body in which an opening accessible to the head of the bolt is formed, and can be opened and closed. A possible closing plate.
If such a configuration is not adopted, a hole must be provided in the head of the bolt so that an operator's hand or tool can approach the head of the bolt, and it is not preferable to make a hole in the head of the pile. . Therefore, in the present invention, by providing an opening in the lid, it is not necessary to provide a hole that reduces the strength of the pile head.

  According to the present invention, the degree of adhesion of the lid to the pile head can be improved with a simple operation.

It is a top view showing one embodiment of a pile head structure concerning the present invention. It is sectional drawing which follows the AA line of FIG. It is a perspective view which shows the volt | bolt for fixation.

  Hereinafter, preferred embodiments of a pile head structure according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, a pile 1 made of steel pipe or concrete is driven into the ground to a predetermined depth, and the hollow pile 1 is a part of an upper structure (for example, a building or a house). It is deeply buried in the ground to support the pillars that make up. The pile head 1 </ b> A of the pile 1 is excavated and exposed to the soil of the ground after the pile 1 is completely buried, and is cut as necessary at a height position planned by surveying.

  An opening 1 a is formed at the upper end of the pile head 1 </ b> A, and the opening 1 a is closed by the lid 2. The lid body 2 was placed on the lid body 3 so as to close the ring-shaped lid body 3 placed on the upper end 1b of the pile head 1A and the opening 3a formed at the center of the lid body 3. A circular closing plate 4. The closing plate 4 is detachable from the lid body 3 and can be opened and closed, and is fixed to the lid body 3 by three detachable bolts 5. The opening 3a of the lid body 3 has a size that allows a tool or a hand to approach a head 10b of a fixing bolt 10 to be described later.

  On the back surface of the lid body 3, the upper ends of the bolt mounting portions 6 positioned between the detachable bolts 5 in the circumferential direction are fixed by welding. The bolt mounting portion 6 is formed in a plate shape and protrudes downward from the lower surface 3 b of the lid body 3. The bolt mounting portion 6 has a female screw portion 6a. A fixing bolt 10 is screwed onto the female screw portion 6a. The shaft portion 10a of the bolt 10 extends in a substantially horizontal plane, and the tip of the shaft portion 10a is connected to the inner wall surface 1c of the pile head 1A. Pressed.

  As shown in FIGS. 1 and 3, when the bolt 10 is a right-hand thread, the shaft portion 10a of the bolt 10 extends in a direction orthogonal to the inner wall surface 1c of the pile head 1A. When the axis passing through the center of 10a is the reference axis L, the center axis P of the bolt 10 screwed to the bolt mounting portion 6 is centered on the center point O of the female screw portion 6a with respect to the reference axis L. In the horizontal plane, it is tilted clockwise by an angle α of 0 ° <α ≦ 60 °. Here, the inner wall surface 1c is curved, and being orthogonal to such an inner wall surface 1c means being orthogonal to a tangent line passing through the inner wall surface 1c. If the angle α exceeds the above-described value, the phenomenon shown by the arrow B hardly occurs.

  In such a pile head structure, with the tip of the shaft portion 10a of the fixing bolt 10 hitting the inner wall surface 1c of the pile head 1A, the head 10b of the bolt 10 is moved to the arrow for tightening the bolt 10. When turned in the C direction, the bolt 10 is a right-hand thread, so that the tip of the shaft portion 10a of the bolt 10 tends to move or shift downward or to the lower right as indicated by an arrow B. By such movement of the tip of the shaft portion 10a of the bolt 10, it is possible to generate a force that strongly presses the lid body 3 of the lid body 2 against the upper end 1b of the pile head 1A.

  As a result of the lid 2 being placed on the upper end 1b of the pile head 1A, the load applied from the pillar to the lid 2 can be reliably transmitted to the pile head 1A. And since this cover body 2 can be stuck tightly to the upper end 1b of the pile head 1A, the situation where the cover body 2 rotates in the horizontal plane or the cover body 2 floats at the upper end 1b of the pile head 1A is avoided. Can be made.

  In addition, when a load is applied to the lid body 2 from the column while the lid body 2 is floating, the lid body 2 comes into close contact with the upper end 1b of the pile head 1A at that time, and the lid body 2 is displaced. . Therefore, when the above-described configuration is employed, the lid 2 can be reliably prevented from being lifted by a simple operation when the lid 2 is fixed to the pile head 1A with the bolt 10.

  Moreover, if a hole is provided in the pile head 1A so that an operator's hand or tool can approach the head 10b of the bolt 10, the strength of the pile head 1A is reduced. Therefore, the lid 2 is provided with a closing plate 4 that can be opened and closed by attaching and detaching the detachable bolt 5.

  The present invention is not limited to the above-described embodiment, and various modifications as described below are possible without departing from the gist of the present invention.

The inner wall surface 1c of the pile head 1A is not limited to a curved surface, and may be a flat surface.
If the bolt is a left-hand thread, the center axis of the bolt is centered on the center point of the female thread, and counterclockwise by an angle α of 0 degrees <α ≦ 60 degrees in the horizontal plane with respect to the reference axis. Just tilt it.

DESCRIPTION OF SYMBOLS 1A ... Pile head 1a ... Opening 1b ... Upper end of pile head 1c ... Inner wall surface 2 ... Lid body 3 ... Lid main body 3a ... Opening part 3b ... Bottom surface of lid body 4 ... Closure plate 5 ... Removable bolt 6 ... Bolt attaching part 6a ... Female thread part 10 ... Bolt 10a ... Shaft part 10b ... Head L ... Reference axis O ... Center point P ... Center axis alpha ... Angle

Claims (2)

In the pile head structure in which the lid is fixed to the pile head of the hollow pile erected on the ground,
A bolt mounting portion projecting downward from the lower surface of the lid placed on the upper end of the pile head;
A screw that is screwed to the female thread portion of the bolt mounting portion, and that a shaft portion extends in a substantially horizontal direction, and a tip of the shaft portion is pressed against an inner wall surface of the pile head, and
When the axis passing through the center of the shaft in a state where the shaft of the bolt extends perpendicularly to the inner wall surface of the pile head,
A central axis of the bolt screwed to the bolt mounting portion is centered on a central point of the female screw portion, and is an angle α of 0 degree <α ≦ 60 degrees in a horizontal plane with respect to the reference axis. A pile head structure characterized by tilting clockwise when the bolt is a right-hand thread and counterclockwise when the bolt is a left-hand thread. The lid is
A lid body that is placed on the upper end of the pile head and has an opening that is accessible to the head of the bolt;
The pile head structure according to claim 1, further comprising a closing plate that is detachable from the lid body and capable of opening and closing the opening.

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