JPH1113058A - Pile joint part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile joint part in which special processing is not required, in which junction work at site is easy, and which has a functionally rational structure. SOLUTION: An upper and a lower piles 1a, 1b are connected to each other through a cylindrical connection pipe 2. The connection pipe 2 is locked to an end part of one pile 1a by a bolt 3 without largely deflecting from a joint part. The connection pipe 2 has a roughly similar inner diameter to an outer diameter of a pile 1, and it has such a length (h) as to cover an end part specified zone of the lower pile 1a and an end part specified zone of the upper pile 1b. Compression force in an axial direction of the pile 1 is directly transmitted from a lower end surface of the upper pile 1b to an upper end surface of the lower pile 1a. A little clearance is provided between an outer surface of the upper and lower pile 1a, 1b and an inner surface of the connection pipe 2, so connection of the piles 1a, 1b to each other is facilitated, and the upper and the lower piles 1a, 1b are relatively movable in the axial direction of the pile 1 in the connection pipe 2 to vibration such as an earthquake or pulling force applied to the pile 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a joint portion of a pile when a plurality of piles are vertically connected and used as a foundation pile or the like.

[0002]

2. Description of the Related Art A connection portion of an existing pile is formed by welding end plates fixed to a pile end portion, by forming a screw portion at a pile end portion and joining by screw type, or by using a ring-shaped metal fitting. There are things to join.

[0003] For example, Japanese Unexamined Utility Model Publication No. 50-12512 and Japanese Unexamined Utility Model Application Publication No.
No. 730 describes a reinforcing band or a joint ring having irregularities arranged so as to straddle between upper and lower pile ends, and tightening these to integrate the upper and lower piles.

Further, Japanese Utility Model Publication No. 7-47453 discloses that
It describes that a relatively narrow connecting ring having several annular grooves is pressed against a pile joint with a fastener and integrated by welding.

[0005]

As described above, the conventional ring-shaped joint fitting is mainly press-fitted to the end of the pile and integrated with the upper and lower piles itself.
It is necessary to form irregularities on the inner surface and to process the pile end side, which requires much labor. In particular, processing on the pile side leads to an increase in the cost of the pile itself.

[0006] In addition, it takes time and effort to perform the joining work on site, and since it is assumed that the pile is integrated with the pile body by tightening or the like, the joint may not function properly if not sufficiently tightened. Further, it is conceivable that the fitting fitting, the fastening tool, and the like protruding from the outer peripheral surface of the pile may be an obstacle depending on the mounting method.

Further, since the joint fitting is integrated with the pile body, when a large force acts on the pile due to an earthquake or the like, the joint fitting or the joint may be broken.

On the other hand, a large compressive force acts on the foundation pile by supporting the upper structure, and if only the compressive force in the axial direction is considered, if the transmission of the compressive force between the upper and lower pile end faces is ensured. Well, it is not always necessary to integrate them.

[0009] Regarding the bending force acting on the pile, the largest bending moment usually acts on the pile head, and depending on the joint position, the bending strength may not be required so much. By allowing relative movement between the upper and lower piles to some extent, breakage of the pile body can be prevented.

The present invention has been made to solve the above-mentioned problems in the prior art, and does not require any special processing, is easy to perform on-site joining work, and has a structurally reasonable pile. The purpose of the present invention is to provide a joint part.

[0011]

The joint portion of the pile according to the present invention has an inner diameter substantially equal to the outer diameter of the pile, and a required section of an end of the lower pile and an end of the upper pile where the end faces abut each other. Part of the required section and cover length, covering the connecting pipe consisting of a metal pipe with the required bending rigidity between the upper and lower pile ends,
This connecting pipe is fixed to one of the upper and lower pile ends with bolts or pins penetrating through the pipe wall of the connecting pipe, and at least one of the upper and lower pile ends against vibration or pulling force acting on the pile. Can be relatively moved in the pile axis direction in the connection pipe.

That is, the pile end and the connecting pipe are not integrated by fixing, but the pile supporting force between the upper and lower piles to be connected is basically transmitted directly between the upper and lower pile end faces. .

However, it is necessary to prevent the connection pipe from coming off the end of the pile, and by fixing it to one of the upper and lower pile ends with a bolt or a pin penetrating the pipe wall of the connection pipe, The connecting pipe is prevented from coming off by the acting vibration or pulling force.

Normally, the connecting pipe is fixed to the upper end of the lower pile, but it is also possible to fix it to the lower end of the upper pile.

Pile is mainly made of precast concrete,
A steel pipe pile, a steel-concrete composite pile, or the like is targeted, and a short steel pipe or the like can be used as a connection pipe. However, the connection pipe is not particularly limited as long as it has a necessary bending rigidity.

In a conventional joint structure that is integrated with a pile body by a fastening metal or the like, since a tensile force or the like is transmitted as it is even at the joint, a large tensile strength and bending strength are required for the metal fitting at the joint. Further, since a large tensile force and a large bending force act on the pile, there is a problem of breakage, particularly in a concrete pile or the like.

On the other hand, by making at least one of the upper and lower piles relatively movable in the axial direction of the pile in the connecting pipe, the connecting pipe and the pile do not need so large tensile strength and bending strength, and have a reasonable structure. Becomes In addition, if the hole of the connection pipe through which the bolt or the pin is passed is a long hole long in the longitudinal direction of the pile, the other pile can be moved relative to the connection pipe in the pile axis direction within the range of the long hole.

In another preferred embodiment, the upper and lower piles to be connected are knotted piles having alternately a knot portion and a torso portion, and the connecting pipe is externally fitted to a torso portion formed at an end portion of the knotted pile. It is limited. If the lower end of the connecting pipe is brought into contact with the node of the lower knot,
The joints on the lower knots serve as stoppers to perform the function of positioning the connecting pipes.However, if the connecting pipes are to be bolted to the upper ends of the lower knots with bolts or pins, the lower ends of the connecting pipes should be It may or may not be brought into contact with the node of the knot.

The third aspect of the present invention limits the case in which a partition plate as a stopper is provided at a longitudinally intermediate portion of the connection pipe. In connection at the site, positioning with respect to a pile, a bolt or a pin position is performed. It will be easier.

[0020]

FIG. 1 shows an embodiment of a joint portion of a pile according to the present invention, in which a lower pile 1a and an upper pile 1b are connected via a connection pipe 2. FIG. Further, the lower end of the connection pipe 2 is fixed to the upper end of the lower pile 1a by a bolt 3 so as not to be largely displaced from the joint.
Note that a female screw portion to which the bolt is fitted is formed in advance on the upper end of the lower pile 1a to which the bolt 3 is fixed.

The connecting pipe 2 has an inner diameter substantially equal to the outer diameter of the pile 1 and covers a required end section of the lower pile 1a and a required end section of the upper pile 1b, whose end faces abut each other. Has a length h.

The compressive force in the axial direction due to the overhead load (mainly the load on the upper structure) is directly transmitted from the lower end surface of the upper pile 1b to the upper end surface of the lower pile 1a, and the connecting pipe 2 is basically connected. Bending resistance is given to horizontal displacement of the upper and lower piles 1a and 1b without bearing the overload.

In this example, there is a slight clearance between the outer surfaces of the upper and lower piles 1a, 1b and the inner surface of the connection pipe 2. When connecting the piles 1a, 1b, the connection pipe 2 is connected to the lower pile. 1a, the upper pile 1b is easily inserted into the connection pipe 2, and the upper pile 1b is connected to the connection pipe 2 against vibration or pulling force acting on the pile 1 such as an earthquake. It is designed to be able to move relatively in the axial direction of the pile inside.

FIG. 2 shows another embodiment of the present invention.
). In this example, the pile 1 is a knotted pile, and when connecting the upper and lower knots 1a and 1b via the connection pipe 2, the node 4 having a larger diameter than the connection pipe 2 facilitates positioning and connection. .

FIG. 3 shows still another embodiment of the present invention. In this example, a partition plate 5 as a stopper is provided at the center of the connection pipe 2, and this partition plate 5 facilitates positioning and connection when connecting the upper and lower piles 1a and 1b.

FIG. 4 shows still another embodiment of the present invention, in which the outer diameter of the connection pipe 2 is made substantially the same as the outer shape of the general part of the upper and lower piles 1a, 1b, so that the protrusion at the joint part is obtained. The construction has been eliminated to facilitate installation. However, in this case, it is necessary to process the small-diameter portions 8 at the ends of the upper and lower piles 1a and 1b.

[0027]

[Effects of the Invention] A simple connection pipe having a cylindrical shape is used, and no special processing is required on both the pile side and the connection tool side.

The on-site joining operation simply involves placing a cylindrical connection pipe on the end of the pile, or inserting the end of the pile into the connection pipe, and simply joining the connection pipe and one of the piles with bolts or pins. It is also excellent in workability.

There is almost no protrusion from the outer peripheral surface of the pile, which hinders construction.

Since the structure is simple and the workability at the site is good, the cost can be reduced.

Since the pile can be moved relative to the pile in the axial direction of the pile in the connecting pipe against vibration or pulling force due to an earthquake or the like acting on the pile, the connecting pipe only has to bear substantially only bending force and shearing force.

In the joint part according to the second aspect, the joint part of the joint pile can be used for positioning the connecting pipe, and the joining is further facilitated.

In the joint according to the third aspect, the partition plate provided at the intermediate portion of the connection pipe can be used for positioning of the pile, the bolt or the pin, and the connection work is facilitated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

FIG. 4 is a sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... pile, 1a ... lower pile, 1b ... upper pile, 2 ... connection pipe, 3 ... bolt, 4 ... joint part, 5 ... partition plate, 8 ... small diameter part

Claims (3)

[Claims] An inner diameter substantially equal to an outer diameter of the pile, and having a length covering an end required section of a lower pile and an end required section of an upper pile whose end faces are abutted with each other; A connecting pipe made of a metal pipe having a required bending rigidity is placed between the upper and lower pile ends, and the connecting pipe is bolted to one of the upper and lower pile ends through a pipe wall of the connecting pipe. Alternatively, a joint portion of a pile, wherein at least one of the upper and lower ends of the pile is relatively movable in the pile axial direction in the connection pipe against vibration or pulling force acting on the pile with a pin. 2. The pile joint according to claim 1, wherein the pile is a knot pile having a knot portion and a torso portion alternately, and the connecting pipe is externally fitted to a torso portion formed at an end portion of the knot pile. Department. 3. The joint portion of a pile according to claim 1, wherein a partition plate as a stopper is provided at an intermediate portion in a longitudinal direction of the connection pipe.