JP2002146779A - Connecting structure of pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the connecting structure of a pile capable of simply joining an upper pile and a lower pile surely and having high workability. SOLUTION: In the connecting structure of the piles joining the upper pile 1 and the lower pile 3, a plurality of cylindrical projections 5 are projected from the end face of one pile 3 in the axial direction of the pile 3 while recessed sections 6 into which the cylindrical projections 5 are inserted are formed to the other piles 1, the outer circumferential surfaces of the projections 5 are pushed against the inner circumferential surfaces of the recessed sections 6 by pressing pins 7 into the projections 5 and expanding the pins in the recessed sections 6, and the projections 5 are fixed into the recessed sections 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for piles, and more particularly, to a connection structure for piles with high workability that can easily and surely join an upper pile and a lower pile.

[0002]

2. Description of the Related Art Conventionally, as a connection structure of piles 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. This connection structure of piles by welding requires time for welding, it is not possible to perform welding work at the construction site depending on the weather, and furthermore, to prevent welding defects and weld brittleness ,
The required equipment and skilled technicians are required, resulting in problems such as high costs and shortage of technicians.

In order to cope with this problem, a pair of an inner fitting portion and an outer fitting portion are separately provided at the end of the upper pile and the end of the lower pile, and the inner fitting portion and the outer fitting portion are provided separately. There is known a pile connection 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 pile, which screw-connects the inner fitting portion and the outer fitting portion provided at the end of the upper pile and the end of the lower pile, forms a screw in the inner fitting portion and the outer fitting portion having a large diameter. In addition, the screw connection work of heavy piles is inferior in workability and requires much labor, and the screws formed in the inner and outer fitting parts are damaged. In this case, there is a problem that the screw connection operation becomes difficult.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional pile connection structure, and has a highly workable pile connection structure capable of easily and reliably joining an upper pile and a lower pile. The purpose is to provide.

[0005]

In order to achieve the above object, a pile connection structure according to the present invention is a pile connection structure for joining an upper pile and a lower pile, wherein a plurality of cylindrical projections are provided from one end of one pile. A protrusion in the axial direction of the pile, and a recess in which the cylindrical protrusion is inserted is formed in the other pile, and a pin is press-fitted into the cylindrical protrusion to expand in the recess, thereby forming a cylindrical shape. The outer peripheral surface of the projection is pressed against the inner peripheral surface of the concave portion, and the cylindrical projection is fixed in the concave portion.

In this connection structure for a pile, the pin is aligned with the cylindrical projection, the cylindrical projection and the concave portion are positioned, and the upper pile is abutted against the lower pile. By contacting the bottom and being pressed into the cylindrical projection, the cylindrical projection expands, whereby the outer peripheral surface of the cylindrical projection is pressed against the inner peripheral surface of the concave portion, and the cylindrical projection is inserted into the concave portion. By fixing this cylindrical projection in the recess,
The upper and lower piles can be joined.

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

[0008] This makes it possible to easily and accurately expand the cylindrical projection.

Further, the inner peripheral surface of the concave portion can be formed in a reverse tapered shape.

Thus, it is possible to securely fix the expanded cylindrical projection in the concave portion.

Further, the outer peripheral surface of the cylindrical projection can be formed in a tapered shape.

Thus, the positioning and fitting of the cylindrical projection into the recess can be easily performed.

A projection and / or a groove is formed on the outer peripheral surface of the cylindrical projection, and a groove and / or a groove on which the projection fits when the cylindrical projection is expanded is formed on the inner peripheral surface of the concave portion. A projection that fits into the groove can be formed.

Thus, it is possible to securely fix the expanded cylindrical projection in the concave portion.

Further, the outer peripheral surface of the cylindrical projection and / or the inner peripheral surface of the concave portion can be formed as a rough surface. Here, the “rough surface” includes not only regular irregularities but also irregular irregularities.

Thus, the expanded cylindrical projection can be reliably 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 concave portion only by aligning the cylindrical projection with either the pin or the concave portion.

Further, the cylindrical projection is screwed into a screw hole of a tension bolt formed on the metal plate at the end of one of the piles.
The recess can be formed by using the screw hole of the tension bolt formed in the end metal plate of the other pile.

Thus, it is possible to easily provide the cylindrical projection and the concave portion by using the screw holes of the tension bolts formed in the end metal plate provided on the prestressed concrete pile.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pile connection structure of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of a connection structure for piles according to the present invention. This pile connection structure joins the upper pile 1 and the lower pile 3 via the end metal plate 2 of the upper pile 1 made of a concrete pile and the end metal plate 4 of the lower pile 3 also made of a concrete pile. It is like that.

In this embodiment, a plurality of cylindrical projections 5 are screwed into screw holes formed in the metal plate 4 at the end of the lower pile 3 so that the cylindrical projections 5 extend from the end face of the lower pile 3. 3 so as to protrude in the axial direction. On the other hand, in the end face of the end metal plate 2 of the upper pile 1, a concave portion 6 into which the cylindrical projection 5 projecting from the end face of the lower pile 3 is inserted is formed. And
A pin 7 having a reverse taper shape is press-fitted into the cylindrical protrusion 5, and the cylindrical protrusion 5 is pressed.
Is expanded in the concave portion 6 to press the outer peripheral surface of the cylindrical projection 5 against the inner peripheral surface of the concave portion 6 to fix the cylindrical projection 5 in the concave portion 6. By being fixed, the upper pile 1 and the lower pile 3 are joined via the end metal plate 2 and the end metal plate 4.

The cylindrical projection 5 is made of a cylindrical material such as a plastically deformable metal or the like, and is fixed by screwing a male screw 5a formed in the base into a screw hole formed in the end metal plate 4. ing. As shown in FIG. 3, a slit 8 is formed in the cylindrical projection 5 in the axial direction, so that when the pin 7 is pressed in, the cylindrical projection 5 can be easily and accurately expanded. Have to be able to. In addition,
In the cylindrical projection 5 shown in FIG. 3, four slits 8 are formed at equal angular intervals, but the number of slits 8 is four.
The number is not limited to five and may be set to five or more or three or less.

The concave portion 6 is formed in a reverse tapered shape extending to the back side, and the angle of the reverse taper of the concave portion 6 is preferably set to the angle of the reverse taper of the pin 7. In this manner, by forming the concave portion 6 in a reverse taper shape, the expanded cylindrical projection 5 can be reliably fixed in the concave portion 6.

The pin 7 can be temporarily fixed by being inserted into the cylindrical projection 5. Therefore, the pin 7 has a slightly smaller diameter at the lower part of the inverted tapered portion 7 b formed in an inverted tapered shape. The shaft portion 7a is integrally provided.
Further, it is desirable that the pin 7 should have a length at least straddling the joint between the end metal plate 2 and the end metal plate 4. Thereby, the shear strength at the joint between the end metal plate 2 of the upper pile 1 and the end metal plate 4 of the lower pile 3 can be improved.

By the way, in this connection structure of piles, FIG.
As shown in (a), with the pin 7 inserted into the cylindrical projection 5, the cylindrical projection 5 and the concave portion 6 are positioned, and the end metal plate 2 of the upper pile 1 is replaced with the end metal plate of the lower pile 3. 4, the pin 7 comes into contact with the bottom 6 a of the concave portion 6 by its own weight of the upper pile 1 and is pressed into the cylindrical projection 5.
As shown in FIG. 7, the cylindrical projection 5 expands, thereby pressing the outer peripheral surface of the cylindrical projection 5 against the inner peripheral surface of the concave portion 6 to fix the cylindrical projection 5 in the concave portion 6. By fixing 5 in recess 6, upper pile 1 and lower pile 3 can be easily and reliably joined via end metal plate 2 and end metal plate 4.

On the other hand, as shown in FIG. 4, it is also possible to form the outer peripheral surface of the cylindrical projection 5 into a tapered shape so that the positioning and insertion of the cylindrical projection 5 into the recess 6 can be performed. It can be easily performed. In this connection structure of the pile, a screw hole 9 of a tension bolt described later is used,
By using the spacer 10 together, the cylindrical projection 5 and the concave portion 6 are provided.

As shown in FIG. 5, it is also possible to fix the pin 7 at the center of the bottom 6a of the concave portion 6 in advance. The cylindrical projection 5 can be easily positioned in the recess 6. In this case, the guide shaft 7a of the pin 7 can be made to protrude from the recess 6 by a required length, and the guide shaft 7a can be formed to have a slightly smaller diameter so that it can be easily inserted into the cylindrical projection 5. Also, shorten the pin 7 and
If the cylindrical projection 5 is fixed so as not to come out of the
, The cylindrical projection 5 can be automatically aligned with the pin 7.

As shown in FIG. 6A, the threaded holes 9 of the tension bolts used in the production of the prestressed concrete pile are in phase with the end metal plates 2 and 4 of the prestressed concrete pile. And a plurality of them are formed at equal intervals. The screw holes 9 of the tension bolts are used when manufacturing the prestressed concrete pile, and are unnecessary when driving the pile. In the present embodiment, the screw holes 9 are formed in the end metal plates 2 and 4. The cylindrical projection 5 and the concave portion 6 can be easily provided by using the screw hole 9 of the tension bolt. That is, as shown in FIG. 6B, a male screw 5 a is formed at the base of the cylindrical projection 5, and the male screw 5 a is screwed into a screw hole 9 of a tension bolt formed on the end metal plate 4 of the lower pile 3. , Concave portion 6 at the end metal plate 2 of upper pile 1
Is formed using the screw hole 9 of the tensioning bolt formed in the above. The recess 6 may be formed in a reverse taper shape, although the screw hole 9 of the tension bolt may be used as it is. In this case, the concave portion 6 can be formed in a reverse tapered shape by providing a nut-shaped spacer 10 having the inside formed in a reverse tapered shape and screwing the spacer 10 into the screw hole 9 of the tension bolt. Also, as shown in FIG. 6 (a), a screw hole or the like is separately formed without using the screw hole 9 of the tension bolt formed on the end metal plate 2, 4 of the prestressed concrete pile. A cylindrical protrusion 5 and a concave portion 6 may be provided.

As shown in FIG. 7A, an annular projection 11 is formed on the outer peripheral surface of the cylindrical projection 5 and the cylindrical projection 5 is expanded on the inner peripheral surface of the concave portion 6. An annular groove 12 into which the protrusion 11 fits can be formed. In this case, as the annular protrusion 11 formed on the outer peripheral surface of the cylindrical protrusion 5, for example, another member such as a coil spring can be used. Further, the protrusions 11 and the grooves 12 do not necessarily need to be formed in an annular shape, but may be formed intermittently. This makes it possible to securely fix the expanded cylindrical projection 5 in the concave portion 6.

On the other hand, as shown in FIG. 7B, an annular groove 12 is formed on the outer peripheral surface of
An annular projection 11 that fits into the groove 12 when the cylindrical projection 5 is expanded can be formed on the inner peripheral surface of the cylindrical projection 5. Also in this case, as the annular protrusion 11 formed on the inner peripheral surface of the concave portion 6, for example, another member such as a coil spring can be used. Also, the protrusion 11 and the groove 12 are not necessarily
It does not need to be formed in an annular shape, but may be formed intermittently. This makes it possible to securely fix the expanded cylindrical projection 5 in the concave portion 6.

In addition, the outer peripheral surface of the cylindrical projection and / or the inner peripheral surface of the concave portion can be formed as a rough surface (not shown). Here, the “rough surface” includes not only regular irregularities such as an annular shape but also irregular irregularities. Thereby, it is possible to reliably fix the expanded cylindrical projection in the concave portion.

Further, in each of the above embodiments, the cylindrical projection 5 is cylindrical and the concave portion 6 is a circular hole into which the cylindrical projection 5 is inserted. May be a triangular tube or square tube as shown in FIGS. 8 (a) and 8 (b), a tube having a substantially polygonal cross section as shown in FIG. 9, an ellipse or any other cross section. A cylindrical body having a shape can be appropriately selected and configured. The concave portion 6 also has a triangular hole or a square hole corresponding to the shape of the cylindrical protrusion 5, a hole having a substantially polygonal cross section, an ellipse or other shape. Can be formed in a hole having an arbitrary cross-sectional shape. In this case, the pin 7 is also formed into a prism having a triangular prism, a quadrangular prism, a substantially polygonal cross-section, an ellipse or any other cross-section according to the shape of the cylindrical projection 5. Is used.

As described above, the connection structure of the pile according to the present invention has been described based on a plurality of embodiments. However, the present invention is not limited to the configuration described in the above embodiment, but is described in each embodiment. Or fixing means such as welding or shrink fitting may be applied instead of screwing in projecting the cylindrical projection 5 to the end metal plate 4 in a range that does not deviate from the purpose. The configuration can be appropriately changed. Further, the connection structure for piles of the present invention can be applied to steel pipe piles and the like in addition to concrete piles. In addition, the cylindrical protrusion 5 and the concave portion 6
As shown in FIG. 10 corresponding to FIG. 2, it can be formed on either the upper pile or the lower pile, and can be appropriately selected and used according to construction conditions and the like.

[0036]

According to the connection structure for a pile according to the present invention, the cylindrical projection and the concave portion are positioned with the pin aligned with the cylindrical projection, and the upper pile is brought into contact with the lower pile, whereby the upper pile is connected. The pin comes into contact with the bottom of the concave portion by its own weight and is pressed into the cylindrical projection, whereby the cylindrical projection expands, thereby pressing the outer peripheral surface of the cylindrical projection against the inner peripheral surface of the concave portion. The upper stake and the lower stake can be joined by fixing the projection in the recess and fixing the cylindrical projection in the recess. This solves all of the problems of the conventional pile connection structure in terms of workability, quality, cost, and the like, and allows the upper pile and the lower pile to be easily and reliably joined.

By forming a slit in the cylindrical projection in the axial direction, the cylindrical projection can be easily and accurately expanded.

Further, by forming the inner peripheral surface of the concave portion in an inversely tapered shape, it is possible to reliably fix the expanded cylindrical projection in the concave portion.

Further, by forming the outer peripheral surface of the cylindrical projection into a tapered shape, positioning and fitting of the cylindrical projection into the concave portion can be easily performed.

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 into which the projection fits when the cylindrical projection is expanded on the inner peripheral surface of the concave portion. By forming the protrusion fitting into the groove, the expanded cylindrical protrusion can be reliably fixed in the recess.

Further, by forming the outer peripheral surface of the cylindrical projection and / or the inner peripheral surface of the concave portion as a rough surface, it is possible to securely fix the expanded cylindrical projection in the concave portion.

Further, by fixing the pin to the bottom of the recess, the cylindrical projection can be positioned in both the pin and the recess only by aligning the cylindrical projection with either the pin or the recess.

Further, the cylindrical projection is screwed into a screw hole of a tension bolt formed on the end metal plate of one of the piles,
By forming the recess using the screw hole of the tension bolt formed in the end metal plate of the other pile, the screw of the tension bolt formed in the end metal plate disposed on the prestressed concrete pile is formed. By using the holes, the cylindrical protrusion and the concave portion can be easily provided.

[Brief description of the drawings]

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

FIGS. 2A and 2B show a cylindrical projection and a concave portion of the embodiment, wherein 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 is a perspective view showing a cylindrical projection and a pin of the embodiment.

FIG. 4 shows an embodiment in which a cylindrical projection is formed in a tapered shape;
(A) is an enlarged sectional view showing a state before connection, and (b) is an enlarged sectional view showing a state after connection.

FIG. 5 is an enlarged sectional view showing an embodiment in which a pin is fixed to a bottom of a concave portion.

FIG. 6 shows an embodiment in which cylindrical projections and concave portions are provided using screw holes of tension bolts, (a) is a plan view of an end metal plate,
(B) is an enlarged sectional view showing a state before connection.

FIGS. 7A and 7B show an embodiment in which an annular protrusion and a groove are provided in a cylindrical protrusion and a concave portion, FIG. 7A is an enlarged sectional view showing an embodiment in which a protrusion is provided in a cylindrical protrusion, and FIG. It is an expanded sectional view which shows the Example which provided the groove | channel in the protrusion.

FIG. 8 is a perspective view showing a modified example of the shapes of the cylindrical protrusion and the concave portion.

FIG. 9 is a plan view showing a modified example of the shapes of the cylindrical protrusion and the concave portion.

10A and 10B show a modified example corresponding to FIG. 2 in which the positions of forming the cylindrical protrusions and the concave portions are changed, wherein FIG. 10A is an enlarged sectional view showing a state before connection, and FIG. 10B is a state after connection. It is an expanded sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper pile 2 End metal plate 3 Lower pile 4 End metal plate 5 Cylindrical protrusion 5a Male screw 6 Depression 6a Bottom of depression 7 Pin 7a Guide shaft 7b Reverse taper 8 Slit 9 Tension bolt screw hole 10 Spacer 11 annular protrusion 12 annular groove

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masaki Akane 2-1-1, Komyobashi, Chuo-ku, Osaka-shi, Osaka Inside Geotop Co., Ltd. (72) Inventor Jun Nishiwaki 2-1-1, Funakoshi-cho, Chuo-ku, Osaka-shi, Osaka No. 11 F term (reference) 2D041 AA02 DB02 DB07 DB12 DB13

Claims (8)

[Claims] In a connection structure of a pile for joining an upper pile and a lower pile, a plurality of cylindrical projections are protruded from an end face of one of the piles in the axial direction of the pile, and the cylindrical projection is formed on the other pile. Is formed, and a pin is press-fitted into the cylindrical projection and expanded in the concave, thereby pressing the outer peripheral surface of the cylindrical projection against the inner peripheral surface of the concave, and placing the cylindrical projection in the concave. Connection structure of piles characterized by being fixed. 2. The connection structure for piles according to claim 1, wherein a slit is formed in the cylindrical projection in the axial direction. 3. The pile connection structure according to claim 1, wherein an inner peripheral surface of the concave portion is formed in a reverse tapered shape. 4. The pile connection structure according to claim 1, wherein an outer peripheral surface of the cylindrical projection is formed in a tapered shape. 5. A projection and / or groove is formed on an outer peripheral surface of a cylindrical projection, and a groove and / or a groove is formed on an inner peripheral surface of the concave portion, where the projection fits when the cylindrical projection is expanded. 4. A projection which is fitted in said groove.
Or the connection structure of the pile of 4. 6. The method according to claim 1, wherein the outer peripheral surface of the cylindrical projection and / or the inner peripheral surface of the concave portion are formed as rough surfaces.
The connection structure for piles according to 3, 4, or 5. 7. The pile connection structure according to claim 1, wherein the pin is fixed to a bottom of the recess. 8. A tensioning bolt formed in a threaded hole of a tensioning bolt formed in an end metal plate of one of the piles and a concave portion formed in an end metal plate of the other pile. The pile connection structure according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the connection structure is formed by using the screw hole of (1).