JP2003193481A - Mounting structure of base plate to pile head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a base plate to a pile head, which absorbs horizontal displacement between a pile core and a superstructure, positively prevents horizontal slippage between a pile and the superstructure, and facilitates work for preventing the horizontal slippage. <P>SOLUTION: A pile head 1a of the pile is cylindrically formed, and the base plate 2 has a projecting body 3 into the pile head is formed on a lower surface of the base plate 2 in one piece with the same. The projecting body 3 has an outer peripheral size sufficient to be inserted into the pile head 1 as a loose hole. Then, a stuffing material 4 is filled in a gap between an outer peripheral portion of the projecting body 3 into the pile head and an inner peripheral portion of the pile head 1a, whereby the stuffing material 4 functions to inhibit the relative horizontal slippage between the base plate 2 and the pile head 1a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a base plate on a pile head.

[0002]

2. Description of the Related Art As shown in FIG. 5, as a method for connecting a steel pipe pile 51 struck in the ground and a steel frame column 52 of a building which is an upper structure, a base plate is mounted on the top surface of the pile head of the steel pipe pile 51. 53 and the base plate 53
And the base plate 54 of the pillar 52 are joined by bolts 55.

In this connection method, since the core of the pile 51 and the module of the building may not coincide with each other, in such a case, the bolt through holes 53a of the base plate 53 on the pile 51 side or the pillar 52 side. Base plate 5
It is also practiced that the bolt through holes 54a of 4 are formed as loose holes and the looseness of the cores is absorbed by these loose holes.

In absorbing the core misalignment, there is a possibility that slippage may occur between the base plates 53 and 54 only by making the bolt through holes loose holes, which causes lateral slippage of the upper structure of the building. Therefore, in order to prevent lateral sliding of the upper structure, bolts 55
, And the bolt through holes 53a ... Or 54a.

[0005]

However, the number of the bolt through holes 53a, 54a for joining the base plate 53 on the pile 51 side and the base plate 54 on the column 52 side is not sufficient one by one, and as shown in the figure, at least four are required. Generally, 8 or more are required, and if all or any of the bolt holes that were made into loose holes were filled with horizontal sliding prevention material, the construction would be very troublesome. There was a problem of being lost.

In view of the above-mentioned problems, the present invention is capable of absorbing the lateral deviation between the pile core and the upper structure, while ensuring the occurrence of lateral slip between the pile and the upper structure. It is an object of the present invention to provide a structure for mounting a base plate on a pile head, which can be prevented from occurring and yet can be easily installed to prevent lateral slippage.

[0007]

[Means for Solving the Problems] The above-mentioned problem is that the pile head has a tubular shape, and a projection body in the pile head of an outer peripheral size having a loose hole in the pile head is integrally provided on the lower surface of the base plate. The padding is provided between the outer peripheral part of the projecting body in the pile head and the inner peripheral part of the pile head, and the padding regulates the occurrence of relative lateral sliding between the base plate and the pile head. This is solved by the mounting structure of the base plate on the pile head, which is characterized in that

In this structure, the protrusion in the pile head on the lower surface of the base plate is moved laterally in the pile head which is a loose hole to absorb the lateral deviation between the pile core and the upper structure. be able to.

Moreover, since the padding is provided between the outer peripheral portion of the intra-pile head projection and the inner peripheral portion of the pile head, the padding can surely prevent lateral slip between the pile and the upper structure. You can

Since the stuffing is only required to be provided at one place between the outer peripheral portion of the projecting body in the pile head and the inner peripheral portion of the pile head, construction for preventing lateral slippage between the pile and the upper structure. Can be done easily.

In the above mounting structure, the inner periphery of the loose hole of the pile head and the outer periphery of the projecting portion inside the pile head are respectively formed in a circular shape, and the padding covers the outer peripheral portion corresponding to the inner peripheral portion of the pile head. It is provided with an inner peripheral portion corresponding to the outer peripheral portion of the in-pile head protrusion, and the center of curvature of the inner peripheral portion and the center of curvature of the outer peripheral portion can be relatively changed in the plane direction. If the piles are misaligned, the use of this filling will prevent lateral slippage between the piles and the superstructure regardless of the direction and distance of the core misalignment. Therefore, the construction can be performed easily.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

In the mounting structure of the first embodiment shown in FIGS. 1 and 2, 1 is a pile and 2 is a base plate. The pile 1 is made of a circular steel pipe pile, and the pile head 1a is formed of a circular steel pipe that constitutes the main body of the pile 1 and has a tubular shape.

At the central portion of the lower surface of the base plate 2, a pile head projection 3 made of a circular steel pipe is integrally attached by welding or the like. The pile head projecting body 3 has an outer diameter smaller than the inner diameter of the pile head 1a and is projected into the pile head 1a as a loose hole in the pile head 1a. By moving the sideways, the pile head 1a
It is possible to adjust the position of the base plate 2 in the plane direction with respect to.

In order to fix this position adjustment state, a padding 4 is provided between the outer peripheral portion of the pile head projection 3 and the inner peripheral portion of the pile head 1a. The generation of relative lateral slip between the pile 2 and the pile head 1a is restricted.

The padding 4 comprises first and second two crescent-shaped parts 5 and 6 having eccentricity between the center of the outer circle and the center of the inner circle. In the crescent-shaped component 5, the radius of curvature of its arcuate outer peripheral surface 5a is set to be substantially the same as the inner radius of the pile head 1a, and the second crescent-shaped component 6 has its arcuate inner peripheral surface 6b. The radius of curvature is set to be approximately the same as the outer radius of the protrusion 3 in the pile head. The first and second crescent-shaped components 5 and 6 have the arc-shaped inner peripheral surface 5b of the first crescent-shaped component 5 and the arc-shaped outer peripheral surface 6a of the second crescent-shaped component 6, respectively. The padding 4 is formed by combining the circles of the above so as to be rotatable relative to each other.

In this padding 4, FIGS. 2A to 2C are used.
As shown in FIG. 1, the outer peripheral portion 5 of the first crescent-shaped component 5 is rotated by relatively rotating the first and second crescent-shaped components 5, 6.
The center of curvature of a and the inner peripheral portion 6 of the second crescent-shaped component 6
The curvature center position of b relatively changes in the plane direction.

By filling this filling 4 into the gap between the outer peripheral portion of the in-pile head projection 3 and the inner peripheral portion of the pile head 1a, this gap is filled with the filling 4 and the base plate 2 with respect to the pile 1 is filled. The occurrence of lateral slip is prevented.

In this embodiment, the padding 4 and the pile head 1 are used.
It is connected to a with a screw 7, and the protrusion 3 in the pile head
A plate 8 which projects laterally is attached to the lower end of the base plate, and this plate 8 is engaged with the padding 4 so that upward removal of the base plate 2 from the pile head 1a is restricted. Has been done. Crescent part 5,
With respect to 6, they may be integrated with each other by screws or the like, or may simply be fitted. Further, in the above-mentioned mounted state, the base plate 8 may be fixed so as to prevent it from rotating.

By using the bolt through holes 2a ... To the base plate 2, for example, a pillar base plate, which is an upper structure, is bolted to connect the pile 1 to the upper structure of the building. It In this bolt connection, it is not necessary to make the bolt through holes 2a of the base plate on the pile 1 side and the bolt through holes of the base plate on the pillar side loose holes, so that the horizontal sliding of the upper and lower base plates can be prevented by the bolts. The filling of the bolt holes can eliminate this.

As described above, in the above-described mounting structure, the intra-pile head projection 3 is moved laterally within the pile head 1a, which is a loose hole, so that the lateral displacement between the pile core and the upper structure is caused. Since the padding 4 can be absorbed, and the padding 4 is provided between the outer peripheral portion of the in-pile head projection 3 and the inner peripheral portion of the pile head 1a, the padding 4 enables the pile 1 and the upper structure to be It is possible to reliably prevent the occurrence of horizontal slippage. Since the padding 4 only needs to be set at one place between the outer peripheral portion of the in-pile head projection 3 and the inner peripheral portion of the pile head 1a, it is possible to prevent lateral slip between the pile 1 and the upper structure. Construction can be performed easily. Furthermore, since the stuffing 4 is a combination of the first and second crescent-shaped parts 5 and 6, the pile 1
If the stuffing 4 is used, regardless of the direction and the distance of the wicking, it is possible to prevent the occurrence of lateral slip between the pile 1 and the upper structure by using only the padding 4, and the construction is easy. You can go.

FIG. 3 shows a modification of the padding 4. The padding 4 is also composed of the first and second parts 5 and 6, but neither of them is a crescent-shaped open cross section, but the center of curvature of the outer peripheral portions 5a and 6a and the inner peripheral portions 5b and 6b. It is composed of a cylindrical part with a closed cross-section that is eccentric with respect to the center of curvature. Even with the stuffing 4 having such an aspect, as in the case of the crescent shape, the center of curvature of the inner peripheral portion 5b and the outer peripheral portion 6 are formed.
The curvature center position of a can be relatively changed in the plane direction.

In this way, the padding 4 is essentially the pile head 1a.
And an inner peripheral portion 6b corresponding to the outer peripheral portion of the intra-pile head projection 3, and
It suffices that the center of curvature of the inner peripheral portion 6b and the center of curvature of the outer peripheral portion 5a can be relatively changed in the plane direction, and there is no particular limitation on the number or the form of parts. .

In the second embodiment shown in FIG. 4, the intra-pile head projection 3 is composed of a cylindrical body 9 having an internal thread portion 9a on the inner circumference and a male thread body 10 having an external thread portion 10a on the outer circumference. The tubular body 9 is integrally attached to the central portion of the lower surface of the base plate 2 by welding or the like, and the male screw body 10 is screwed to the tubular body 9 so as to project downward. And stuffing 4
A female screw portion 4a is formed on the inner peripheral portion of the female screw portion 4a.
The male screw portion 10a of the male screw body 10 is screwed into a. The padding 4 is fixed to the inside of the pile head 1a with bolts 11 ...

According to this mounting structure, the height position of the base plate 2 with respect to the pile head 1a can be adjusted to a low level, and when there is a construction error in the height direction of the pile head 1a, this construction error is absorbed. Then, the base plate 2 can be set at an appropriate height position in relation to the upper structure.

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 the above-mentioned embodiment, the case where the pile head is composed of the steel pipe ends of the steel pipe pile is shown.However, the end of the pile steel pipe is provided with a cylindrical metal object, and this metal object is used as the pile head. May be. Also,
Such a tubular metal piece may be used as a pile head, and the pile body may be something other than a circular steel pipe.

[0027]

As described above, the present invention is capable of absorbing the lateral deviation between the pile core and the upper structure, and at the same time, causes the lateral slip between the pile and the upper structure. Can be surely prevented, and yet the construction for preventing lateral slip can be easily performed.

[Brief description of drawings]

1A and 1B show a mounting structure according to a first embodiment, wherein FIG. 1A is a sectional side view, and FIG. 1B is a sectional view taken along line I-I of FIG. 1A.

2A to 2C are plan cross-sectional views of a padding used in the above-mentioned mounting structure in a state in which the relative rotational positions of the parts are variously changed.

FIG. 3 shows a modified example of padding, in which FIG.
Plane sectional view of the part, FIG. (B) is a plane sectional view of the second part,
FIG. 3C is a plan cross-sectional view of a padding formed by combining these parts.

4A and 4B show a mounting structure of a second embodiment, FIG. 4A is a sectional side view, and FIG. 4B is II-II in FIG. 4A.
It is a line sectional view.

FIG. 5 is a partial cross-sectional perspective view showing a conventional example and showing a pillar-side base plate and a pile-side base plate in a separated state.

[Explanation of symbols]

1 ... pile 1a ... pile head 2 ... Base plate 3 ... Pile head protrusion 4 ... Stuffed

Claims (2)

[Claims] 1. The pile head has a tubular shape, and an intra-pile head protrusion having an outer peripheral size having a loose hole in the pile head is integrally provided on the lower surface of the base plate. A padding is provided between the outer peripheral portion and the inner peripheral portion of the pile head, and the padding prevents the occurrence of relative lateral slip between the base plate and the pile head. Base plate mounting structure. 2. The inner circumference of the loose hole of the pile head and the outer circumference of the projecting portion inside the pile head are each formed in a circular shape, and the padding includes an outer peripheral portion corresponding to the inner peripheral portion of the pile head, An inner peripheral portion corresponding to the outer peripheral portion of the intra-pile head projection is provided, and the center of curvature of the inner peripheral portion and the center of curvature of the outer peripheral portion can be relatively changed in the plane direction. The structure for mounting a base plate on a pile head according to claim 1.