JP2002339348A - Joint structure of pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable pipes forming a pile to be joined together without undergoing drill-through working at a site of execution of work for the pile. SOLUTION: In the pile 5 formed by joining the pipes together, a socket 4 of an upper pipe 3 is made to cover a spigot 2 of a lower pipe 1, and a back end face 7 of the socket 4 is brought into contact with an end face 6 of the spigot 2 so as to be made capable of bearing a compressive force in an axial direction of the pile 5. An axial protrusion 14 is formed in either of a back part of the socket 4 and an end of the spigot 2, and an axial notched part 13, into which the protrusion 14 is fitted, is formed in the other one of them. A slit part 16 having an appropriate length is formed in the axial direction from a proper position on an end face 15 of the socket 4. Paired protrusions 17, which face each other and protrude outward in a radial direction, are formed respectively along one and the other axial edges 16a and 16a forming the slit part 16, and fastened with a bolt 19 and a nut 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile joint structure.

[0002]

2. Description of the Related Art Usually, a pile used as a foundation for a building is formed by joining a plurality of cast pipes made of, for example, ductile cast iron. To use this pile vertically buried for use as a foundation for buildings,
A rotating torque is applied to a leading pipe having a spiral excavated portion at a lower portion, and the spiral excavated portion digs down the ground vertically. When the head pipe enters the ground to a certain depth,
A new pipe is added to the end opposite to the excavated part and fixed,
A rotating torque is applied to the added pipe, and the leading pipe is dug deep into the ground.

When the added pipe enters the ground to a certain depth, a new pipe is added to the upper end thereof and fixed, and the same operation is repeated until the pile is formed to a predetermined length. Thereby, the pile can be provided in a vertically buried state.

[0004] In the above-described method for forming a pile, a joint state between pipes, that is, a joint structure of a pile capable of transmitting rotational torque will be described with reference to FIG. As shown in FIG. 9, in a state where the receiving port 4 formed at the lower end of the upper pipe 3 is covered by the insertion port 2 formed at the upper end of the lower pipe 1, the upper pipe 3 and the lower pipe 1 are covered. Are added to form the pile 5.

[0005] Lower pipe 1 at construction site of pile 5 for building
As a method for joining the upper tube 3 and the upper tube 3, as shown in FIG.
Until the rear end face 7 inside the receptacle 4 hits the end face 6 of the receptacle 2, cover the receptacle 4 with the receptacle 2, and fix the receptacle 2 and the receptacle 4 by an appropriate method so as not to be shifted from each other. And drill 8
The hole 4 and the hole 2 are co-drilled by using
To form In the insertion opening 2 and the receiving opening 4, a co-hole 9 is formed at a position on the opposite side from the co-hole 9 through the axis. Thereafter, at the position appropriately shifted in the axial direction from the position where the co-hole 9 is formed, and at the position shifted in the circumferential direction from the direction in which the processing is performed, for example, at a position shifted by 90 degrees, similarly to the above, And two holes of the receiving port 4 are subjected to co-drilling processing to form other common holes 9 respectively.

When the four co-holes 9 are formed, as shown in FIG. 9, bolts 10 are inserted through the co-holes 9 facing each other in the radial direction, and nuts 12 are tightened with washers 11 from both ends thereof. The insertion opening 2 and the receiving opening 4 are fixed so as not to be shifted from each other. Similarly to the above, the bolts 1 at the positions axially displaced from this position and at a position shifted 90 degrees in the circumferential direction are connected to the holes 9 facing each other in the radial direction.
0 is inserted, and the nut 12 is tightened from both ends thereof with the washers 11 interposed therebetween to further fix the insertion opening 2 and the receiving opening 4 so as not to be displaced from each other. Thus, the insertion port 2 and the reception port 4
Are fixed so as to be integrated as a pile 5, the structure of the formed pile 5 is stable, and a rotational torque for excavating a head pipe (not shown) can be transmitted.
After the pile 5 has been driven, the building can be stably supported.

[0007]

As described above, in the prior art, when the lower pipe 1 and the upper pipe 3 forming the pile 5 are joined, the receiving port 4 and the insertion port 2 are required each time the pile 5 is constructed.
Had been drilled together.

However, when the opening 2 and the receiving port 4 are subjected to co-drilling at the construction site, the rear end face 7 of the receiving port 4 and the end face 6 of the inserting port 2 are fixed to each other, and the drill 8 is fixed.
Since the holes 9 are formed by using the method, there is a possibility that the working time is delayed.

In order to eliminate such a delay of the working time, if a common hole 9 is previously provided in the insertion opening 2 and the receiving opening 4 in a pipe manufacturing plant or the like, the pile 5 at the construction site is This is good because it saves you work, but
In order to allow a dimensional tolerance generated when the co-hole 9 is machined, a slightly larger co-hole 9 must be formed. However, if such a slightly larger hole 9 is used, play may occur in the circumferential direction and the axial direction.
It is not preferable to form the through hole 9 in advance because it is not preferable to form the through hole 9.

Accordingly, an object of the present invention is to solve such a problem and to enable pipes forming a pile to be joined together without performing drilling work at a pile construction site.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, in a pile formed by joining a plurality of cast pipes, an end of one of the pipes joined to each other is provided. A socket formed at the end of the other pipe is covered by the formed insertion port, and a rear end face inside the reception port contacts an end face of the insertion port and acts in the axial direction of the pile. A compressive force can be supported, and a projection in the axial direction is formed on one of the inner part of the receptacle and the tip of the insertion port, and the projection fits into the other. A notch in the axial direction is formed, and a slit of an appropriate length is formed in an axial direction from an appropriate position on the end face of the receptacle, and one and the other edges in the axial direction forming the slit are formed in the axial direction. A pair of protrusions projecting radially outwardly and facing each other Are formed respectively, the pair of protrusions in which are fastened by fasteners.

According to such a configuration, when the insertion port and the reception port are joined at the construction site of the pile, the projection at the reception port is inserted into the notch of the insertion port, and the receiving section is inserted. Since the protruding portions facing each other across the slit portion in the mouth are fastened by fasteners, the circumferential interval of the slit portion is narrowed, and the insertion port and the receiving port are firmly and integrally fixed. be able to. Therefore, it is not necessary to form a co-hole in the insertion opening and the reception opening, and the insertion opening and the reception opening can be easily joined at the pile construction site, and the construction work can be performed efficiently. Further, by narrowing the circumferential interval of the slit portion by the fastener, it is possible to suppress backlash that may occur in the radial direction, and it is possible to firmly integrate the insertion port and the receiving port, A pile having a stable structure can be formed. In addition, the rotational torque acting on one of the tubes can be transmitted from the protrusion to the other tube via the notch.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A joint structure for a pile according to the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, a socket 4 formed at a lower end of the upper pipe 3 is added to an insertion opening 2 formed at an upper end of the lower pipe 1 to form a pile 5. FIGS. 4 and 5 show the shape of the insertion port 2 that fits into the receiving port 4. FIG.

As shown in FIGS. 4 and 5, when the receiving port 4 is added to the receiving port 2, from an appropriate position of the receiving port 2 entering the receiving port 4 to the end face 6 in the axial direction and in the circumferential direction. A rectangular notch 13 is provided at an appropriate position, for example, at two positions facing each other, and an inclined surface 13 a is formed on the end face 6 side of the insertion opening 2 in the notch 13.

FIG.
As shown in FIG. As shown in FIG. 6 to FIG.
Is formed thicker than the tube body 3a at the bottom, and a back end face 7 is formed at the inner back of the receiving port 4. Further, a rectangular projection 14 continuous from the rear end face 7 is formed at each position corresponding to the position of the notch 13 of the insertion hole 2 fitted into the reception port 4 inside the reception port 4. I have. The radial thickness of the projection 14 is the same as that of the rear end face 7 of the socket 4.

At two positions of the receptacle 4 which are displaced in the circumferential direction from the projection 14, for example, two positions which are displaced by 90 degrees, the slit portion 1 having an appropriate length in the axial direction from the end face 15 of the receptacle 4 is provided.
6 are provided. Protrusions 17, 17 projecting radially outward are provided on the outer peripheral surface 4b of the receptacle 4 along the edges 16a, 16a of the slit portion 16 in the axial direction.

Notches 18 are formed in the projecting portion 17, for example, at three axial positions from an appropriate position of the projecting portion 17 to a radially outer end face 17a.
Similarly, a notch 18 is provided in a protruding portion 17 facing the slit portion 16 via the slit portion 16.

In the above-described configuration, as shown in FIG.
While the respective projections 14 provided on the inside are fitted, the receiving port 4 is covered with the insertion port 2 until the rear end face 7 of the receiving port 4 hits the end face 6 of the insertion port 2. At this time, since the inclined surface 13 a is provided on the end surface 6 side of the insertion opening 2 in the notch 13, the protrusion 14 is guided by the inclined surface 13 a, so that it is easy to fit into the notch 13.

When the rear end face 7 of the receptacle 4 hits the end face 6 of the insertion port 2 and the insertion port 2 is stuck in the reception port 4, FIG.
As shown in FIGS. 3 to 3, the notch 18 of the projection 17 of the receptacle 4
Then, a bolt 19 as a fastener is passed through, and a nut 20 is tightened to fix the insertion opening 2 and the receiving opening 4.

As described above, when the insertion port 2 and the receiving port 4 are joined at the construction site of the pile 5, the state in which the projection 14 at the receiving port 4 is fitted into the notch 13 of the insertion port 2. Since the projecting portions 17 facing each other in the receiving port 4 are fastened by the bolts 19 and nuts 20 serving as fasteners, the circumferential interval of the slit portion 16 is narrowed, and the insertion port 2 and the receiving port 4 are separated. It can be fixed firmly and integrally. Therefore, a hole 9 is formed in the insertion opening 2 and the reception opening 4.
It is not necessary to form a hole,
And the receiving port 4 can be easily joined, and the construction work can be performed efficiently. Further, by narrowing the circumferential interval of the slit portion 16 by the bolt 19 and the nut 20, the play which may occur in the radial direction is suppressed, and the insertion opening 2 and the receiving opening 4 are firmly integrated. Therefore, the pile 5 having a stable structure can be formed. In addition, the rotational torque acting on the upper tube 3 can be transmitted from the protrusion 14 to the lower tube 1 via the notch 13. Further, even if the pile 5 is pulled out due to re-installation or the like, since the insertion port 2 and the reception port 4 are firmly and integrally joined, the reception port 4 does not come off from the insertion port 2. Therefore, the pile 5 can sufficiently withstand the pulling force acting in the axial direction.

Generally, the tube after centrifugal casting is pulled out from the receiving side of the mold, so that the notch 13 and the inclined surface 13a connected to the end 6 of the insertion port 2 can be formed without using a core. It can be formed in a mold, and even in such a case, the tube can be easily pulled out after casting. Therefore, the notch 13 and the inclined surface 13a in the insertion opening 2 can be easily formed by casting. Further, the rear end face 7, the projection 14, the slit 16 and the projection 17 in the receptacle 4 are:
The combination of the die and the core on the receiving port 4 side enables easy formation by casting.
For this reason, the time for forming the insertion opening 2 and the receiving opening 4 by processing can be omitted, and the working efficiency can be further improved.

[0022]

As described above, according to the present invention, when a spigot and a spigot are joined at a pile construction site, the projection at the spigot fits into the cutout of the spigot. Since the projecting portions facing each other across the slit portion in the socket are fastened by fasteners, the circumferential interval of the slit portion is narrowed, and the insertion port and the receiving port are tightly integrated. Can be fixed to
Therefore, it is not necessary to form a co-hole in the insertion opening and the reception opening, and the insertion opening and the reception opening can be easily joined at the pile construction site, and the construction work can be performed efficiently.
Further, by narrowing the circumferential interval of the slit portion by the fastener, it is possible to suppress backlash that may occur in the radial direction, and it is possible to firmly integrate the insertion port and the receiving port, A pile having a stable structure can be formed. In addition, the rotational torque acting on one of the tubes can be transmitted from the protrusion to the other tube via the notch.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing a joint structure of a pile according to the present invention.

FIG. 2 is a side view showing a joint structure of a pile according to the present invention.

FIG. 3 is a radial sectional view showing a joint structure of a pile according to the present invention.

FIG. 4 is an axial sectional view of an insertion hole forming a pile according to the present invention.

FIG. 5 is a radial sectional view of an insertion opening forming a pile according to the present invention.

FIG. 6 is an axial sectional view of a socket forming a pile according to the invention.

FIG. 7 is an axial section, different from FIG. 6, of the socket forming the pile according to the invention.

FIG. 8 is a radial sectional view of a socket forming a pile according to the present invention.

FIG. 9 is an axial cross-sectional view showing a conventional pile joint structure.

FIG. 10 is a cross-sectional view illustrating a conventional method for forming a pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower pipe 2 Insertion port 3 Upper pipe 4 Reception port 4a Inner peripheral surface 5 Pile 6 End face 7 Back end face 13 Notch part 14 Projection part 15 End face 16 Slit part 16a Edge 17 Projection part 19 Bolt 20 Nut

Claims (1)

[Claims] 1. A pile formed by joining a plurality of cast pipes, a spigot formed at an end of one of the pipes joined to each other, and a socket formed at an end of the other pipe. Is covered, and a rear end surface inside the socket is capable of supporting a compressive force acting in the axial direction of the pile by contacting an end surface of the insertion port, and a back portion of the reception port and the insertion port An axial projection is formed on one of the distal end and an axial cutout on which the projection fits, and an appropriate position on the end face of the receptacle is formed on the other. In the axial direction, a slit portion of an appropriate length is formed, and along one and the other edges in the axial direction forming the slit portion,
A joint structure for piles, wherein a pair of projecting portions projecting radially outward and facing each other are formed, and the pair of projecting portions are fastened by fasteners.