JP3909566B2 - Pile joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pile joint structure, and more particularly to a joint structure applied when a lower pile and an upper pile are added at a construction site.
[0002]
[Prior art]
Generally, in pile construction, when the placement depth is large, construction is performed while adding a plurality of pile bodies. Conventionally, the work of adding piles has been performed by welding, but there are problems such as that the work takes time, that special skills are required, and that it depends on the weather. In order to solve these problems, various joint structures not based on welding have been proposed (for example, JP-A-8-27781, JP-A-9-137447, JP-A-11-21882, No. 2000-319874).
[0003]
In each of these prior arts, an upper pile and a lower pile are connected by a fitting method, and an axial retaining mechanism is added. However, the one described in Japanese Patent Application Laid-Open No. 11-21882 has a problem with reliability after construction because it does not have a detent mechanism. On the other hand, the other publications described in the above-mentioned publications are provided with a screwing mechanism using bolts although they have a rotation-preventing mechanism. For this reason, problems such as a complicated structure and troublesome connection work are expected.
[0004]
[Problems to be solved by the invention]
The present invention has been made on the basis of the technical background as described above, and has a very simple structure in spite of having a detent mechanism, and can easily perform a connecting operation. It aims at providing the joint structure of a pile.
[0005]
[Means for Solving the Problems]
The present invention employs the following means in order to achieve the above object.
That is, this invention is a joint structure for fitting a fitting male part and a fitting female part respectively provided in two upper and lower pile bodies and connecting these pile bodies,
An engagement groove comprising an axial groove portion formed in the axial direction of the pile from its end surface and a circumferential groove portion formed in the circumferential direction connected to the lower portion of the inner periphery of the fitting female portion is surrounded. There are several in the direction at intervals,
On the outer periphery of the fitting male part, there are provided a plurality of engaging protrusions that are fitted into the axial groove part of the engaging groove with the fitting female part at intervals in the circumferential direction. The rotation preventing member is temporarily fixed so as to be above each engaging protrusion and to be axially aligned with the protrusion;
When the fitting male part fitted into the fitting female part is rotated, the engagement protrusion is fitted into the circumferential groove part of the engagement groove, and the temporary stop of the rotation preventing member is released. In the joint structure of a pile, the rotation blocking member is configured to drop in the axial groove portion and close the inlet portion of the circumferential groove portion.
[0006]
The rotation preventing member can be, for example, a rectangular parallelepiped. Further, the rotation prevention member can be constituted by a divided body divided into two and spring members each having both ends attached to these divided bodies. In this case, the rotation prevention member is formed of the divided body. By bringing the end surfaces close to each other, the spring member is temporarily fixed to the fitting female portion in a compressed state, and when the engaging projection is fitted into the circumferential groove portion, the divided body is the axial groove portion. Are spaced apart from each other.
[0007]
According to this invention, when the fitting male part is rotated in a state where the fitting male part and the fitting female part are fitted, the engaging projection is fitted into the circumferential groove portion of the engaging groove. At the same time, the rotation of the mating male part causes a shearing force to act on the rotation prevention member and the temporary fixing is released. As a result, the rotation prevention member falls by its own weight in the axial groove portion, and enters the circumferential groove portion. Close the part. As a result, the engaging protrusion cannot be moved both in the axial direction and in the circumferential direction, and is completely locked, and the upper and lower pile bodies are prevented from coming off and rotating.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a front view showing only a lower pile in cross section. The joint that connects the upper pile body 1 and the lower pile body 2 includes a fitting male portion 3 provided at the lower end of the upper pile body 1 and a fitting female portion 4 provided at the upper end of the lower pile body 2. It has. The fitting male part 3 has a base part 5 having an outer diameter equal to the outer diameter of the upper pile body 1 at the upper end, and is fixed to the end surface of the pile body 1 by welding or the like. The fitting female portion 4 has an outer diameter equal to the outer diameter of the lower pile body 2, and is fixed to the end face of the lower pile body 2 by welding or the like at the lower end. In addition, the joint structure of this embodiment can be applied to the case where the pile bodies 1 and 2 are any of concrete piles, steel pipe piles, and SC piles. For example, in the case of concrete piles, the fitting male part 3 and the fitting female part 4 Is fixed to a steel end plate provided at the end of the pile.
[0009]
A plurality (four in the illustrated example) of engaging grooves 6 are provided in the inner periphery of the fitting female portion 4 at intervals in the circumferential direction. The engagement groove 6 is L-shaped, and includes an axial groove portion 6a formed in the axial direction from the end face of the fitting female portion 4, and a circumferential groove portion 6b formed in the circumferential direction continuously to the lower portion thereof. It has become.
[0010]
A plurality of engaging projections 7 are fixed to the outer periphery of the fitting male portion 3 by welding or the like at intervals in the circumferential direction corresponding to the engaging grooves 6. Further, on the outer periphery of the fitting male portion 3, a rotation preventing member 8 is temporarily fixed by an adhesive or spot welding so as to be above each engaging projection 7 and to be aligned with the projection 7 in the axial direction. Yes. The rotation preventing member 8 is longer than the engaging protrusion 7 and has a rectangular parallelepiped shape. The temporary fixing of the rotation preventing member 8 may be performed on the upper end of the engaging protrusion 7 or the peripheral surface of the fitting male part 3 or on both.
[0011]
Next, a method for connecting piles using the above joint will be described with reference to FIG. As shown in FIG. 3 (a), the engagement protrusion 7 and the axial groove portion 6 a of the engagement groove 6 are aligned, and the fitting male part 3 of the upper pile body 1 is fitted to the lower pile body 2. When the mating portion 4 is fitted, the engaging projection 7 and the rotation preventing member 8 are fitted into the axial groove portion 6a along with the fitting.
[0012]
Next, as shown in FIG. 3 (b), when the upper pile body 1, that is, the fitting male part 3 is rotated in the direction of arrow A, the engaging projection 7 is fitted into the circumferential groove portion 6 b of the engaging groove 6. At the same time, the rotation of the fitting male part 3 causes a shearing force to act on the rotation preventing member 8 and the temporary fixing is released. As a result, the rotation preventing member 8 falls in the axial groove portion 6a by its own weight, and the circumferential direction The inlet part of the groove part 6b is closed. As a result, the engagement protrusion 7 cannot be moved in the axial direction or in the circumferential direction and is completely locked, and the pile bodies 1 and 2 are prevented from coming off and being prevented from rotating.
[0013]
FIG. 4 is a cross-sectional view showing another embodiment of the rotation preventing member 8. In this embodiment, as shown in FIG. 4A, the rotation preventing member 8 is composed of two divided cases 10a and 10b and spring members 11 which are housed and locked in the divided cases 10a and 10b. ing. In the case of this embodiment, as shown in FIG. 4B, the rotation preventing member 8 is in a state where the spring member 11 is compressed by bringing the end faces of the divided cases 10a and 10b close to each other. In the same manner as above, the fitting male part 3 is temporarily fixed.
[0014]
As shown in FIG. 5, when the fitting male part 3 is fitted to the fitting female part 4 and the fitting male part 3 is further rotated, a spring force acts on the rotation preventing member 8 in addition to its own weight. Thus, the divided cases 10a and 10b are separated from each other. As a result, the rotation preventing member 8 reliably closes the inlet portion of the circumferential groove portion 6b, and the engagement protrusion 7 is reliably locked.
[0015]
The fitting male part 3 and the fitting female part 4 can be attached to the piles 1 and 2 in various forms as shown in FIG. FIG. 6A is an attachment configuration adopted in the above embodiment, in which the fitting male part 3 and the fitting female part 4 are fixed to the end surfaces of the pile bodies 1 and 2, respectively. As described above, it can be applied to any concrete pile, steel pipe pile, and SC pile. The attachment form shown in FIG.6 (b) fixes the fitting male part 3 and the fitting female part 4 to the outer periphery of the pile bodies 1 and 2, respectively, In this case, it can apply to a steel pipe pile and SC pile. The attachment form shown in FIG.6 (c) fixes the fitting male part 3 and the fitting female part 4 to the inner periphery of the pile bodies 1 and 2, respectively, In this case, it can apply to a steel pipe pile.
[0016]
The above embodiment is merely an example, and various modifications can be made to the present invention. For example, the circumferential groove portion of the engaging groove may be opposite to that in the above embodiment. Further, as shown in FIG. 7, a plurality (two in the illustrated example) of axial groove portions 6b of the engaging groove 6 may be provided, and a plurality of engaging protrusions 7 may be provided correspondingly. Further, the number of engaging grooves and the number of engaging protrusions and rotation preventing members corresponding to the engaging grooves can be appropriately increased or decreased.
[0017]
【The invention's effect】
As described above, according to the present invention, the pile body can be prevented from coming off and prevented from rotating with a simple structure, and the retaining and turning prevention can be achieved simply by rotating the pile body after fitting. Connection work can be performed easily.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention.
FIG. 2 is a front view of the embodiment showing only a lower pile in cross section.
FIG. 3 is a cross-sectional view showing a method for connecting piles.
FIG. 4 is a cross-sectional view showing another embodiment of the rotation preventing member.
FIG. 5 is a sectional view showing a connected state of piles according to the embodiment.
FIG. 6 is a cross-sectional view showing various attachment modes of the fitting male part and the fitting female part to the pile body.
FIG. 7 is a view showing another embodiment of the engagement protrusion and the engagement groove.
[Explanation of symbols]
1: upper pile body 2: lower pile body 3: fitting male part 4: fitting female part 5: base part 6a: axial groove part 6b: circumferential groove part 6: engaging groove 7: engaging protrusion 8: Rotation prevention member 10a, 10b: division case 11: spring member

Claims (2)

It is a joint structure that connects a fitting male part and a fitting female part respectively provided in the upper and lower two pile bodies and connects these pile bodies,
An engagement groove comprising an axial groove portion formed in the axial direction of the pile from its end surface and a circumferential groove portion formed in the circumferential direction connected to the lower portion of the inner periphery of the fitting female portion is surrounded. There are several in the direction at intervals,
On the outer periphery of the fitting male part, there are provided a plurality of engaging protrusions that are fitted into the axial groove part of the engaging groove with the fitting female part at intervals in the circumferential direction. The rotation preventing member is temporarily fixed so as to be above each engaging protrusion and to be axially aligned with the protrusion;
When the fitting male part fitted into the fitting female part is rotated, the engagement protrusion is fitted into the circumferential groove part of the engagement groove, and the temporary stop of the rotation preventing member is released. A pile joint structure, wherein the rotation blocking member is configured to fall in the axial groove portion and close an inlet portion of the circumferential groove portion. The rotation prevention member is composed of a divided body divided into two, and spring members each having both ends attached to the divided body,
The rotation preventing member is temporarily fixed to the fitting female portion in a compressed state by bringing the end surfaces of the divided bodies close to each other, and when the engaging protrusion is fitted into the circumferential groove portion, 2. The pile joint structure according to claim 1, wherein the divided bodies are separated from each other in the axial groove portion.

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