JP3922901B2 - Pile joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pile joint structure.
[0002]
[Prior 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. In order to use this pile as a foundation for a building, it is provided in a state where it is buried vertically, a rotational torque is applied to the top pipe having a spiral excavation part at the bottom, and this ground excavation part makes the ground Drill down vertically. When the leading pipe enters the ground to a certain depth, a new pipe is added and fixed at the end opposite to the excavation part, and rotational torque is applied to the added pipe, and the leading pipe is further deepened underground. I will continue to dig.
[0003]
When the added pipe enters the ground to a certain depth, a new pipe is added and fixed to the upper end of the pipe, and the same operation is repeated until the pile is formed to a predetermined length. Thereby, the pile can be provided in a state of being buried vertically.
[0004]
In the above pile forming method, a joint state between the pipes, that is, a joint structure of the piles capable of transmitting the rotational torque will be described with reference to FIG.
As shown in FIG. 3, the upper tube 3 is added to the lower tube 1 in a state where the receiving port 4 formed at the lower end portion of the upper tube 3 is put on the insertion port 2 formed at the upper end portion of the lower tube 1. The pile 5 is formed.
[0005]
As a method for joining the lower pipe 1 and the upper pipe 3 at the construction site of the building pile 5, as shown in FIG. 4, the back end surface 7 formed in the inner side of the receiving port 4 is the insertion port 2. The socket 4 is put on the slot 2 until it touches the end face 6, and is fixed so that the slot 2 and the slot 4 do not deviate from each other by an appropriate method. Are subjected to co-drilling to form a co-hole 9. In the insertion port 2 and the receiving port 4, the common hole 9 is formed in the same manner at a position on the opposite side through the axial center from the common hole 9. Thereafter, in the same manner as described above, the insertion port 2 is positioned at a position appropriately shifted in the axial direction from the position where the co-hole 9 is formed and at a position shifted in the circumferential direction from the processed direction, for example, 90 °. And the co-drilling process is given to two places of the receptacle 4, and the other common hole 9 is formed, respectively.
[0006]
When the four co-holes 9 are formed, as shown in FIG. 3, bolts 10 are inserted between the co-holes 9 opposed to each other in the radial direction, and nuts 12 are tightened by inserting washers 11 from both ends thereof. And the receiving port 4 are fixed so as not to deviate from each other. As for the common hole 9 at a position shifted in the axial direction from this position and at a position shifted by 90 degrees in the circumferential direction, similarly to the above, the bolts 10 are inserted between the common holes 9 opposed to each other in the radial direction. Then, a nut 12 is tightened with a washer 11 interposed therebetween, and the insertion port 2 and the receiving port 4 are further fixed so as not to be displaced from each other. Thus, since the insertion port 2 and the receiving port 4 are fixed so as to be integrated as a pile 5, it is possible to transmit a rotational torque for digging the leading pipe (not shown), and the pile 5 After the placement, the building can be stably supported.
[0007]
[Problems to be solved by the invention]
However, in the conventional method for joining the insertion opening 2 and the receiving opening 4, as shown in FIG. 5, the gap 13 caused by the dimensional difference between the formed common hole 9 and the bolt 10, or the outer peripheral surface 2 a of the insertion opening 2. Due to the influence of the gap 14 caused by the dimensional difference between the outer opening 4 and the inner peripheral surface 4 a of the receiving port 4, there is a possibility that play may occur in the joint portion 15 of the insertion port 2 and the receiving port 4. The occurrence of such backlash is not preferable in terms of the role as the pile 5 serving as the foundation of the building.
[0008]
Then, this invention solves such a problem, and when joining a pipe | tube and forming a pile, it aims at joining so that a backlash may not generate | occur | produce in a joint part.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that an insertion port formed at an end portion of one tube joined to each other is covered with a receiving port formed at an end portion of the other tube, A through hole common to the insertion port and the receiving port is formed at a position facing each radial direction, a bolt that penetrates the insertion port and the receiving port in the radial direction is inserted into the through hole, and the bolt is A screw portion at both ends, a shaft portion having a diameter larger than that of the screw portion and not formed with an external screw, and a taper portion formed between the shaft portion and the screw portion. The insertion portion and the receiving port are fixed to each other by passing the portion in an interference fit state and screwing the nut into the screw portion .
[0010]
According to such a configuration, the bolt is inserted into the through-hole formed in common with the insertion port and the receiving port, and the nut is screwed together after the bolt shaft portion is passed in a tight-fitting state. And the socket are fixed to each other in a tight-fitting state, and the bolt and the insertion hole are similarly fixed to each other in a tight-fitting state. Since it is fixed, the insertion port and the receiving port are not shifted from each other in the circumferential direction and the radial direction, and a pile having a stable structure can be formed. Moreover, the shift | offset | difference about the pipe-axis direction of an insertion port and a receiving port can also be prevented.
[0011]
Moreover, even if the force of a pulling direction acts on a pile, it can prevent reliably that an insertion port remove | deviates from a reception port because the insertion port and a reception port are integrally fixed with the volt | bolt. Further, the rotational torque acting on one pipe can be reliably transmitted to the other pipe via the bolt.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a sectional view in the axial direction showing a joint structure of a pile according to the present invention, and FIG. 2 shows a state in which a bolt 16 is passed through the common hole 9 which is a through hole in FIG. It is the enlarged view shown.
[0013]
In the pile joint structure in the present invention shown in FIG. 1, a common hole 9 is formed in the insertion port 2 and the receiving port 4 in the same manner as the pile joint structure in the prior art shown in FIG. As shown in FIG. 2, the bolt 16 passed through the common hole 9 has a screw portion 16b at both ends and an outer screw formed between the screw portions 16b and having a diameter larger than those of the screw portions 16b. A large-diameter portion 16a that is a shaft portion that is not formed is formed. A taper portion 16c is formed between the large diameter portion 16a and the screw portion 16b.
[0014]
The bolt 16 is driven into the common hole 9 and press-fitted so that the large diameter portion 16a of the bolt 16 is in an interference fit state with respect to the common hole 9, and as shown in FIG. The nut 12 is screwed through 11 to fix the insertion port 2 and the receiving port 4 integrally. At this time, since the diameter of the screw portion 16b is smaller than the diameter of the common hole 9, the screw portion 16b can be prevented from being crushed when the bolt 16 is press-fitted. Further, since the bolt 16 is formed with the tapered portion 16c, the bolt 16 can be easily press-fitted. Further, since the inner diameter of the washer 11 is formed larger than the outer diameter of the large diameter portion 16a, it is difficult to screw the nut 12 onto the bolt 16 to fix the insertion port 2 and the receiving port 4. Absent.
[0015]
As described above, the large-diameter portion 16a of the bolt 16 is passed through the common hole 9 formed in common with the insertion port 2 and the receiving port 4 in a tight-fitting state, that is, a press-fit state, and the nut 17 is then inserted. By being screwed together, the bolt 16 and the receiving port 4 are fixed to each other in a tight-fitting state, and the bolt 16 and the insertion port 2 are similarly fixed to each other in a tight-fitting state. Since the insertion port 2 and the receiving port 4 are more reliably fixed by the combination, the insertion port 2 and the receiving port 4 are not displaced from each other in the circumferential direction and the radial direction, and the pile 5 having a stable structure is formed. be able to. Moreover, the shift | offset | difference about the pipe-axis direction of the insertion port 2 and the receiving port 4 can also be prevented.
[0016]
Even if a force in the pulling direction is applied to the pile 5, the insertion port 2 and the receiving port 4 are integrally fixed by the bolt 16, so that the insertion port 2 can be surely removed from the receiving port 4. Can be prevented. Furthermore, the rotational torque that acts on the receiving port 4 that is the upper tube 3 can be reliably transmitted to the insertion port 2 that is the lower tube 1 via the bolt 16.
[0017]
【The invention's effect】
As described above, according to the present invention, the nut is screwed into the through hole formed in common with the insertion port and the receiving port after the shaft portion of the bolt is passed in a tight fit state. The bolt and the receiving port are fixed to each other in a tight-fitting state, and the bolt and the insertion port are similarly fixed to each other in a tight-fitting state. Therefore, the insertion port and the receiving port are not shifted from each other in the circumferential direction and the radial direction, and a pile having a stable structure can be formed. Moreover, the shift | offset | difference about the pipe-axis direction of an insertion port and a receiving port can also be prevented.
[0018]
Moreover, even if the force of a pulling direction acts on a pile, it can prevent reliably that an insertion port remove | deviates from a reception port because the insertion port and a reception port are integrally fixed with the volt | bolt. Further, the rotational torque acting on one pipe can be reliably transmitted to the other pipe via the bolt.
[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 cross-sectional view showing a state where a bolt is fitted into a common hole in FIG.
FIG. 3 is an axial sectional view showing a conventional pile joint structure.
FIG. 4 is a cross-sectional view showing a conventional method for forming a pile.
FIG. 5 is an enlarged view of a main part in FIG. 3;
[Explanation of symbols]
1 Lower pipe 2 Insert 3 Upper pipe 4 Receptor 5 Pile 6 End face 7 Deep end face 9 Common hole 12 Nut 16 Bolt 16a Large diameter part

Claims (1)

The insertion port formed at the end of one tube joined to each other is covered with the receiving port formed at the end of the other tube, and the through-holes common to the insertion port and the receiving port have respective diameters. Bolts that are formed at positions opposite to each other and penetrate the insertion port and the receiving port in the radial direction are inserted into the through holes, and the bolts have screw portions at both ends and a diameter larger than the screw portions and an external screw. And a taper portion formed between the shaft portion and the screw portion. The shaft portion is passed through the through hole in a tight-fitting state, and the nut is passed through the screw portion. The joint structure of the pile characterized by the said insertion port and the said receiving port being mutually fixed by screwing together.

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