JP3418170B2 - Connection structure of pile - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile connecting structure, and more particularly to a pile connecting structure which can easily and reliably connect an upper pile and a lower pile.

[0002]

2. Description of the Related Art Conventionally, as a pile connecting structure for joining an upper pile and a lower pile, a method of joining end metal plates of the upper pile and the lower pile by welding has been widely used. The connection structure of piles by this welding requires time for welding, it is not possible to perform welding work at the construction site depending on the weather, and further, in order to prevent welding defects and brittleness of the welded part, ,
The required equipment and skilled technicians are required, and there are problems that costs are high and there is a shortage of technicians.

In order to deal with this problem, a pair of inner fitting portion and outer fitting portion are separately provided at the end portion of the upper pile and the end portion of the lower pile, and the inner fitting portion and the outer fitting portion are provided. There is known a pile connecting structure in which a screw is formed and an inner fitting portion and an outer fitting portion are screw-connected. However, the connection structure of the piles that screw-connects the inner fitting portion and the outer fitting portion provided at the end portion of the upper pile and the end portion of the lower pile has a screw formed in the inner fitting portion and the outer fitting portion having a large diameter. Machine work for this purpose leads to high cost, and the work of screwing and connecting a pile, which is a heavy object, has poor workability and requires a lot of work, and the screws formed on the inner and outer fitting parts are damaged. However, in this case, there is a problem that the screw connection work becomes difficult.

[0004]

SUMMARY OF THE INVENTION In view of the problems of the conventional pile connecting structure described above, the present invention provides a pile connecting structure having a high workability which enables easy and reliable joining of the upper pile and the lower pile. The purpose is to provide.

[0005]

In order to achieve the above object, a pile connecting structure according to the present invention is a pile connecting structure for joining an upper pile and a lower pile along the outer circumferences of the upper pile and the lower pile. A connecting member is provided so as to straddle the end members of the upper pile and the lower pile that are abutted with each other, and a cylindrical projection is provided on the connecting member so as to project toward the end member. By forming a recess into which the protrusion is inserted and pressing the pin into the cylindrical protrusion to expand the cylindrical protrusion in the recess, the outer peripheral surface of the cylindrical protrusion is pressed against the inner peripheral surface of the recess to form a cylindrical shape. It is characterized in that the projection is fixed in the recess.

In this pile connecting structure, the cylindrical projection of the connecting member is positioned in the recess of each end member with the pin aligned with the cylindrical projection of the connecting member, and the connecting member is pressed toward the pile. As a result, the pin comes into contact with the bottom of the recess and is press-fitted into the tubular projection, whereby the tubular projection expands, thereby pressing the outer peripheral surface of the tubular projection against the inner peripheral surface of the recess, By fixing the tubular protrusion in the recess and fixing the tubular protrusion in the recess, the upper pile and the lower pile can be joined via the connecting member.

In this case, a slit can be formed in the cylindrical projection in the axial direction.

Thus, the expansion of the cylindrical projection can be performed easily and accurately.

Further, the inner peripheral surface of the concave portion can be formed in an inverse taper shape expanding to the inner side .

As a result, the expanded cylindrical projection can be securely fixed in the recess.

Further, a projection and / or a groove is formed on the outer peripheral surface of the cylindrical projection, and a groove and / or a groove to which the projection is fitted when the cylindrical projection is expanded is formed on the inner peripheral surface of the recess. A protrusion that fits in the groove can be formed.

As a result, the expanded cylindrical protrusion can be securely fixed in the recess.

Further, the outer peripheral surface of the cylindrical projection and / or the inner peripheral surface of the recess can be formed as a rough surface. Here, the term "rough surface" includes irregular as well as regular irregularities.

As a result, the expanded cylindrical projection can be securely fixed in the recess.

Further, the pin can be fixed to the bottom of the recess.

Thus, the cylindrical projection can be positioned on both the pin and the recess by merely aligning the cylindrical projection with the pin or the recess.

Further, a ring-shaped backing end member can be fixed inside the end member, and a recess can be formed in the backing end member.

As a result, even when the end member is made of a steel pipe, the concave portion can be formed and the tubular projection of the connecting member can be fixed.

Further, a notch for accommodating the connecting member can be formed on the outer peripheral portion of each end member.

As a result, the protrusion of the connecting member can be eliminated and the outer peripheral surface of the pile can be made smooth.

Further, the connecting member can be formed in a strip shape extending in the circumferential direction of the pile.

As a result, the strength of the connecting portion of the pile can be improved, and the connecting member can be formed thin so that the protruding amount of the connecting member can be reduced.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a pile connecting structure of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of a pile connecting structure according to the present invention. This pile connection structure is such that an end member 2 made of a metal plate of an upper pile 1 made of a concrete pile and an end member 4 made of a metal plate of a lower pile 3 made of a concrete pile are butted against each other, and a connection member 5 is interposed therebetween. Then, the upper pile 1 and the lower pile 3 are joined together.

In this embodiment, the connecting member 5 is arranged along the outer circumference of the upper pile 1 and the lower pile 3 so as to straddle the end members 2 and 4 of the upper pile 1 and the lower pile 3 which are abutted with each other. However, the connecting member 5 is provided with the cylindrical projection 6 projecting toward the end members 2 and 4, while the end members 2 and 4 are provided with
By forming a recess 7 into which the cylindrical protrusion 6 is fitted and pressing the pin 8 into the cylindrical protrusion 6 to expand the pin 8 in the recess 7, the outer peripheral surface of the cylindrical protrusion 6 becomes the inner peripheral surface of the recess 7. By pressing and fixing the cylindrical projection 6 in the recess 7, and fixing the cylindrical projection 6 in the recess 7, the upper pile 1 is connected via the connecting member 5.
And the lower pile 3 are joined together.

The cylindrical projection 6 is made of a plastically deformable metal or the like and has a base portion integrally connected to the connecting member 5. As shown in FIG. 3, the cylindrical projection 6 is formed with a slit 9 in the axial direction, so that when the pin 8 is press-fitted, the cylindrical projection 6 can be easily and accurately expanded. I am able to do that. In the cylindrical projection 6 shown in FIG. 3, four slits 9 are formed at equal angular intervals, but the number of slits 9 is not limited to four and is set to 5 or more or 3 or less. be able to.

The recess 7 is formed in a reverse taper shape that widens to the back side, and the reverse taper angle of the recess 7 is preferably matched with the reverse taper angle of the pin 8. By forming the concave portion 7 in the reverse taper shape in this manner, the expanded cylindrical projection 6 can be reliably fixed in the concave portion 7.

The pin 8 is temporarily fixed by being fitted into the cylindrical projection 6, and therefore, a guide shaft portion 8a is integrally provided at the lower portion of the reverse taper portion.

In this pile connection structure, as shown in FIG. 2A, with the pin 8 inserted in the cylindrical projection 6 of the connecting member 5, the cylindrical projection 6 of the connecting member 5 and each end member By positioning the concave portions 2 and 4 and pressing the connecting member 5 toward the upper pile 1 and the lower pile 3, the pin 8 comes into contact with the bottom portion of the concave portion 7 and is press-fitted into the cylindrical projection 6. Therefore, Fig. 2 (b)
As shown in, the cylindrical projection 6 expands in the recess 7, whereby the outer peripheral surface of the cylindrical projection 6 is pressed against the inner peripheral surface of the recess 7, and the cylindrical projection 6 is fixed in the recess 7. By fixing the tubular projection 6 in the recess 7, the upper pile 1 and the lower pile 3 can be easily and reliably joined via the connecting member 5.

By the way, in the pile connecting structure of the above-mentioned embodiment, the concave portion 7 is formed in an inverse taper shape which expands to the inner side. However, as shown in FIG. 4 (a), the concave portion 7 has a straight shape. The holes may be formed in the above, or as shown in FIG. 4B, the holes may be formed in an inclined manner. In this case, the cylindrical projection 6 can be provided so as to project in a substantially horizontal direction, and the projection 6 can be provided so as to be inclined in conformity with the recessed portion 7 formed by the inclinedly formed hole.

Further, as shown in FIG. 5, each end member 2,
A notch 10 for accommodating the connecting member 5 can be formed on the outer peripheral portion of the connector 4. In this case, the bottom portion 10a of the cutout portion 10
By forming the concave portion 7 in the radial direction of the pile and accommodating the connecting member 5 in the cutout portion 10, it is possible to eliminate the protrusion of the connecting member 5 and to make the outer peripheral surfaces of the upper pile 1 and the lower pile 3 smooth. . Also, with the connection member 5 accommodated in the cutout portion 10,
It is desirable to provide a gap 10b at the upper and lower ends of the connecting member 5, so that when the upper pile 1 and the lower pile 3 are rocked (swing), the end members 2, 4 and the connecting member 5 come into contact with each other. Therefore, it can be surely prevented from being damaged.

Next, FIG. 6 shows a third embodiment of the pile connection structure of the present invention, in which the upper pile 1 made of steel pipe pile and the lower pile 3 made of prestressed concrete pile are joined. The upper pile 1 made of a steel pipe pile has a ring-shaped backing end member 11 fixed to the inside of an end portion (end member) 2 made of a steel pipe K by welding, and the end portion (end The recess 7 is formed in the member 2) and the backing end member 11. The backing end member 11 is, as shown in FIG. 6B, a ring-shaped metallic annular member 12 and a metallic short member that is fixed to the inside of the metallic annular member 12 and forms the bottom of the recess 7. It is composed of a cylinder 13. Note that the metallic annular member 12 and the metallic short tube 13 may be configured as an integrated body instead of separate bodies. In addition, the metal annular member 12
If necessary, a projection 12a that fits into the screw hole 9 of the tension bolt used when manufacturing the prestressed concrete pile of the lower pile 3 and is positioned can be provided on the bottom surface of the. This backing end member 11 is a cylindrical end member 2
Has been previously welded to the end member 2 at a position where
The recess 7 is formed so that the end member 2 and the backing end member 11 communicate with each other. As a result, the concave portion 7 is formed even in the end portion (end member) 2 made of the steel pipe K having no thickness,
The tubular protrusion 6 of the connecting member 5 can be fixed. The configuration of the recess 7 of the lower pile 3 is the same as that of the first embodiment shown in FIGS. By the way, in this embodiment,
The backing end member 11 was fixed to the upper pile 1 made of steel pipe pile, but as in the modified example shown in FIG. 7, it was fixed to the end member 4 of the lower pile 3 made of prestressed concrete pile by welding. You can also do it. Also, when the prestressed concrete pile is used for the upper pile 1 and the steel pipe pile is used for the lower pile 3, they can be joined with the same configuration (upside down configuration).

Further, as shown in FIG. 8, a notch 10 for accommodating the connecting member 5 can be formed in the end portion (end member) 2 made of the steel pipe K as described above. Notch 10
Is formed by cutting out the end portion (end member) 2 of the steel pipe K outside the backing end member 11, and the recess 7
Are directly formed on the backing end member 11. In this case, the cutout portion 10 is formed by cutting out only the portion of the steel pipe K where the connecting member 5 is installed, as shown in FIG. 8A, so that the steel pipe K of the backing end member 11 is formed. There is no problem in fixing to the end portion (end member) 2. The configuration of the notch 10 and the recess 7 of the lower pile 3 is as shown in FIG.
The same as the second embodiment shown in FIG. Thus, the cutout 1
By forming 0 and accommodating the connecting member 5, FIG.
As shown in (c), it is possible to eliminate the protrusion of the connecting member 5 and make the outer peripheral surfaces of the upper pile 1 and the lower pile 3 smooth.

Further, as shown in FIG. 9 (a), the connecting member 5 may be formed in a strip shape extending in the circumferential direction of the pile. This connecting member 5 is formed to have a length that covers 1/4 to 1/2 of the entire circumference of the upper pile 1 and the lower pile 3, and by combining a plurality of the connecting members 5, the upper pile 1 and the lower pile 3 The entire circumference can be covered. Since the strip-shaped connecting member 5 is strong against bending (horizontal force) and shearing force, the upper pile 1 and the lower pile 3
Since the strength of the joint portion can be improved and the connecting member 5 can be formed thin to reduce the amount of protrusion, there is an effect that the notch 10 need not be formed in the end members 2 and 4.

The connecting member 5 is, for example, as shown in FIG.
As shown in (b), the slits 9 are formed at both ends of the pipe 14 having a predetermined length, and the tubular projections 6 can be formed by bending both ends of the pipe 14 at a substantially right angle. it can.

Further, as shown in FIG. 10 (a), when an annular projection 6a is formed on the outer peripheral surface of the cylindrical projection 6 and the cylindrical projection 6 spreads on the inner peripheral surface of the recess 7. On the protrusion 6a
It is possible to form an annular groove 7a in which the two are fitted. In this case, as the annular projection 6a formed on the outer peripheral surface of the cylindrical projection 6, for example, another member such as a coil spring can be used. Further, the protrusion 6a and the groove 7a do not necessarily have to be formed in an annular shape, and may be formed intermittently. This ensures that the expanded cylindrical protrusion 6 is fixed in the recess 7.

On the other hand, as shown in FIG. 10 (b), when an annular groove 6b is formed on the outer peripheral surface of the cylindrical projection 6 and the cylindrical projection 6 is expanded on the inner peripheral surface of the recess 7. An annular protrusion 7b that fits in the groove 6b can be formed. Also in this case, as the annular protrusion 7b formed on the inner peripheral surface of the recess 7, for example, another member such as a coil spring can be used. Further, the protrusion 7b and the groove 6b are not always
It does not need to be formed in a ring shape, and can be formed intermittently. This ensures that the expanded cylindrical protrusion 6 is fixed in the recess 7.

In addition, the outer peripheral surface of the cylindrical protrusion and / or the inner peripheral surface of the recess may be formed as a rough surface (not shown). Here, the term "rough surface" includes irregular asperities such as annular irregularities. As a result, it is possible to securely fix the expanded cylindrical protrusion in the recess.

Further, in each of the above-mentioned embodiments, the cylindrical projection 6 has a cylindrical shape and the concave portion 7 has a circular hole shape into which the cylindrical projection 6 is inserted. 11 has a triangular tube shape, a rectangular tube shape as shown in FIG. 11 (b), a cylindrical body having a substantially polygonal cross section as shown in FIG. 12, an elliptical shape or any other cross section. A cylindrical body having a shape can be appropriately selected and configured, and the concave portion 7 also has a triangular hole or a square hole corresponding to the shape of these cylindrical projections 6, a hole having a substantially polygonal cross section, an ellipse, or the like. Can be formed in a hole having any cross-sectional shape. In this case, pin 8
According to the shape of the cylindrical projection 6, a triangular prism, a quadrangular prism, a columnar body having a substantially polygonal cross section, or an ellipse or a columnar body having any other cross-sectional shape is used.

Further, in each of the above-mentioned embodiments, the connection member 5 has the cylindrical projections 6 formed on the upper and lower sides.
The connecting member 5 may be formed in an X shape as shown in FIG. 13A or may be formed in an oblique shape as shown in FIG. 13B.

Although the pile connection structure of the present invention has been described above based on a plurality of embodiments, the present invention is not limited to the structures described in the above embodiments, but the structures described in each embodiment. The configurations can be changed as appropriate without departing from the spirit of the invention, such as by appropriately combining.

[0042]

According to the pile connection structure of the present invention, the cylindrical projection of the connecting member is positioned in the concave portion of each end member with the pin aligned with the cylindrical projection of the connecting member, and the connecting member is By pressing toward the pile, the pin abuts the bottom of the recess and is press-fitted into the cylindrical projection, whereby the cylindrical projection expands, and the outer peripheral surface of the cylindrical projection is thereby expanded. The upper stake and the lower stake can be joined to each other via the connecting member by being pressed against the inner peripheral surface to fix the tubular protrusion in the recess, and fixing the tubular protrusion in the recess. This allows
With respect to workability, quality, cost, etc., all the problems of the conventional pile connection structure can be solved, and the upper pile and the lower pile can be joined easily and reliably.

Further, by forming a slit in the cylindrical protrusion in the axial direction, the cylindrical protrusion can be easily and accurately expanded.

Further, by forming the inner peripheral surface of the concave portion in an inverted taper shape that widens to the inner side, it is possible to securely fix the expanded cylindrical projection in the concave portion.

Further, a projection and / or a groove is formed on the outer peripheral surface of the cylindrical projection, and a groove and / or a groove to which the projection is fitted when the cylindrical projection is expanded is formed on the inner peripheral surface of the recess. By forming the protrusion that fits in the groove, it is possible to reliably fix the expanded cylindrical protrusion in the recess.

Further, by forming the outer peripheral surface of the cylindrical protrusion and / or the inner peripheral surface of the recessed portion to be rough, it is possible to securely fix the expanded cylindrical protrusion in the recessed portion.

Further, by fixing the pin to the bottom of the recess, it is possible to position the cylindrical protrusion on both the pin and the recess only by aligning the cylindrical protrusion with either the pin or the recess.

Further, by fixing the ring-shaped backing end member inside the end member and forming the recess in the backing end member, even if the end member is made of a steel pipe, the recess is formed. Can be formed and the cylindrical projection of the connection member can be fixed.

Further, by forming a cutout portion for accommodating the connecting member on the outer peripheral portion of each end member, it is possible to eliminate the protrusion of the connecting member and to make the outer peripheral surface of the pile smooth.

By forming the connecting member in the shape of a strip extending in the circumferential direction of the pile, the strength of the connecting portion of the pile can be improved and the connecting member can be formed thin so that the amount of protrusion of the connecting member can be reduced. it can.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the pile connection structure of the present invention,
(A) is an exploded perspective view, (b) is a perspective view showing a state after connection.

2A and 2B show a connecting member and a recess of the embodiment, FIG. 2A is an enlarged sectional view showing a state before connection, and FIG. 2B is an enlarged sectional view showing a state after connection.

FIG. 3 shows a connecting member of the embodiment, (a) is a front view,
(B) is a side view and (c) is a plan view.

FIG. 4 is an explanatory view showing a connection member and a recess of a modified example of the same embodiment.

FIG. 5 shows a second embodiment of the pile connection structure of the present invention,
(A) is an enlarged sectional view showing a state before connection, and (b) is an enlarged sectional view showing a state after connection.

FIG. 6 shows a third embodiment of the pile connection structure of the present invention,
(A) is an expanded sectional view of a connection part, (b) is a perspective view showing a backing end member.

7A and 7B show a modified example of the third embodiment of the pile connecting structure of the present invention, FIG. 7A is an enlarged sectional view of a connecting portion, and FIG. 7B is a perspective view showing a backing end member.

FIG. 8 shows a fourth embodiment of the pile connection structure of the present invention,
(A) is a partially cutaway front view, (b) is an enlarged sectional view showing a state before connection, and (c) is an enlarged sectional view showing a state after connection.

9A and 9B show modified examples of the connection member, FIG. 9A is a perspective view showing a strip-shaped connection member, and FIG. 9B is an explanatory view showing the connection member manufactured by a pipe.

FIG. 10 shows an embodiment in which an annular protrusion and a groove are provided in the cylindrical projection and the recess, (a) is an enlarged cross-sectional view showing an embodiment in which the protrusion is provided on the cylindrical projection, and (b) is a cylinder. FIG. 7 is an enlarged cross-sectional view showing an example in which a groove is provided on the protrusion.

FIG. 11 is a perspective view showing a modified example of the shapes of the cylindrical protrusion and the recess.

FIG. 12 is a plan view showing a modified example of the shapes of the cylindrical protrusion and the recess.

13A and 13B show modified examples of the connection member, FIG. 13A is a front view showing an X-shaped connection member, and FIG. 13B is a front view showing an oblique connection member.

[Explanation of symbols]

1 Upper pile 2 end member 3 lower pile 4 End member 5 connection members 6 cylindrical protrusions 7 recess 8 pin 8a Guide shaft 9 slits 10 Notch 10a bottom 11 Backing end member 12 Metal ring member 13 short metal tubes 14 pipes

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-7-259083 (JP, A) JP-A-2000-46273 (JP, A) JP-A-2000-291000 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) E02D 5/24 101-103

Claims (9)

(57) [Claims] 1. In a pile connecting structure for joining an upper pile and a lower pile, a connecting member is arranged along the outer periphery of the upper pile and the lower pile so as to straddle the end members where the upper pile and the lower pile are butted against each other. Then, the connecting member is provided with a cylindrical projection projecting toward the end member, and each end member is formed with a recess into which the cylindrical projection is fitted, and a pin is press-fitted into the cylindrical projection. Cylindrical protrusion in the recess
The pile connecting structure is characterized in that the outer peripheral surface of the cylindrical projection is pressed against the inner peripheral surface of the recess by expanding the cylindrical projection to fix the cylindrical projection in the recess. 2. The pile connecting structure according to claim 1, wherein a slit is formed in the cylindrical projection in the axial direction. 3. The pile connecting structure according to claim 1, wherein the inner peripheral surface of the recess is formed in an inversely tapered shape that widens to the inner side . 4. A protrusion and / or a groove is formed on the outer peripheral surface of the cylindrical projection, and a groove and / or a groove into which the protrusion is fitted when the cylindrical projection is expanded on the inner peripheral surface of the recess. The connection structure for a pile according to claim 1, 2 or 3, wherein a protrusion that fits into the groove is formed. 5. The outer peripheral surface of the cylindrical projection and / or the inner peripheral surface of the recess is formed as a rough surface.
The pile connection structure according to 3 or 4. 6. The pile connection structure according to claim 1, wherein the pin is fixed to the bottom of the recess. 7. The ring-shaped backing end member is fixed to the inside of the end member, and a recess is formed in the backing end member. The pile connection structure according to 5 or 6. 8. A notch for accommodating a connecting member is formed on an outer peripheral portion of each end member.
The connection structure for piles according to 3, 4, 5, 6 or 7. 9. The connection member is formed in a strip shape extending in the circumferential direction of the pile, and the connection member is formed in a strip shape.
The connection structure for piles according to 6, 7, or 8.