JP2008231733A - Joint structure of pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a pile capable of securing a proper horizontal bearing force by preventing a space from being produced between a pile and a ground. <P>SOLUTION: End plates 3, 7 having projections 4, 8 for engagement projecting from the peripheral edges thereof are fitted to the end surfaces of the connection parts 2, 6 of the upper and lower piles 1, 5 to be connected to each other with diameters smaller than the diameters of the piles formed at the ends of the piles. A ring 12 dividable and fixable is fitted to the outside of the connection parts of the upper and lower piles onto which the end plates are so disposed as to be oppositely brought into contact with each other. The projections 4, 8 for engagement of both the upper and lower end plates so disposed as to be oppositely brought into contact with each other are fitted into the fitting through holes 16 formed in the peripheral wall of the ring at predetermined intervals in the circumferential direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a joint structure of a support pile penetrating into the ground.

Conventionally, as a connection structure of an upper pile and a lower pile, (1) The method of connecting the end plates of an upper pile and a lower pile by welding. (2) A method in which the end portion of the upper pile and the end portion of the lower pile are distributed to a pair of inner fitting portion and outer fitting portion, and the inner fitting portion and the outer fitting portion are screwed together or fitted and connected. (3) A method of attaching flange plates to the ends of the upper pile and the lower pile and connecting the flange plates with bolts has been widely used.

JP 11-218270 A JP 2001-64959 A JP 2000-46273 A JP-A-11-21882 JP 2001-11851 A JP 2002-161532 A

However, the conventional pile connection structures described in the above (1) to (3) have the following problems. First, the method of connecting piles by welding of (1) described above was poor in efficiency because it required a lot of time for welding or the welding work could not be performed depending on the weather at the construction site. In addition, such a welding operation requires necessary equipment and a skilled engineer to prevent welding defects and embrittlement of the welded portion, and is costly. In addition, the welding strength largely depends on the skill of the operator, and there is a problem that the stability and reliability of the joining strength is lacking.

On the other hand, the connection method of the pile which connects the inner fitting part and outer fitting part which were provided in the edge part of the upper pile of the said (2) and the edge part of a lower pile by screwing requires big torque as tightening progresses. Therefore, there is a problem that a large amount of labor is required for connection. Moreover, the connection may be difficult due to rusting of the threaded portion that is the connecting portion of the pile, sand biting, or the like. In addition, in the connection method by fitting, the outer diameter of the joint portion is larger than the inner diameter of the installation hole, so this joint portion becomes a large penetration resistance when the pile is embedded in the ground, and further, the pile and the ground There was a problem in that an appropriate horizontal support force could not be secured because a gap portion was generated between them.

Moreover, the connection method of the pile which connects the flange provided in the edge part of the upper pile and the lower pile of said (3) by bolting is that the outer diameter of a joint part is larger than the outer diameter of a pile, and the outer peripheral surface of a pile Therefore, when the pile is driven in, a large penetration resistance occurs and a bending moment acts on the joint portion. Further, as in the method of connecting piles by fitting, there is a problem in that an appropriate horizontal support force cannot be ensured because a void portion is generated between the pile and the ground.

The present invention has been made in order to solve the conventional problems as described above. The structure is simple, the construction is easy, the cost can be reduced, the reliability is high, and the gap between the pile and the ground is high. It aims at providing the joint structure of the pile which can ensure an appropriate horizontal supporting force, without a part being produced.

In order to achieve the above object, the pile joint structure according to the present invention has a plurality of engagements protruding from the peripheral edge to the end face of the connection portion when the connection portion having a smaller diameter than the pile diameter is formed at the end portion of the pile. The upper and lower piles to be connected by attaching end plates having joint projections, and the upper and lower piles connected with the end plates in contact with each other, are fitted to the outside and relatively vertically, horizontally and circumferentially. A ring that restricts movement in the direction, and the ring can be divided into a plurality of parts in the circumferential direction of the connecting portion, and the upper and lower end plates are arranged in contact with each other on the circumferential wall at predetermined intervals in the circumferential direction. It is characterized by having a configuration in which a fitting through hole is formed in which both engaging convex portions are fitted.

According to the above configuration, the upper and lower piles to be connected are connected by a ring fitted on the outer periphery of the connecting portion having a smaller diameter than the pile diameter, and the outer diameter of the joint portion is made smaller than the outer diameter of the pile body. I can do it. Therefore, the penetration resistance at the time of burying the pile in the ground is small, and further, no gap portion is generated between the pile and the ground, and an appropriate horizontal supporting force can be secured.

In the pile connection structure according to the present invention, the annular groove for inserting the shear key is formed on the joint surface of the both end plates of the upper and lower piles to be connected, and the annular groove inserted into the upper and lower annular grooves is provided. The upper and lower piles are connected via a shear key. According to this structure, the center axis | shaft of a lower pile and the center axis | shaft of an upper pile can be matched easily, and the shift | offset | difference to the horizontal direction with respect to the lower pile of an upper pile can be controlled.

Further, in the pile connection structure according to the present invention, the ring which can be divided into a plurality of parts in the circumferential direction of the connection portion is composed of overlapping portions in which the connecting portions at both ends thereof are made of a tangling structure. The mating portion is fastened by bolting to form an integral structure ring. According to this configuration, after overlapping the overlapping parts, a single-piece ring can be formed by a simple operation of inserting and tightening the bolts into the overlapping bolt holes formed in this part, and connecting the upper and lower piles Construction work of the ring installed in the part can be easily performed.

As described above, the joint structure of a pile according to the present invention has a plurality of engaging protrusions that protrude from the peripheral edge to the end face of the connection portion when the connection portion having a diameter smaller than the pile diameter is formed at the end portion of the pile. The upper and lower piles to be connected to each other and fitted to the outside of the connecting portion of the upper and lower piles disposed in contact with the end plates, and move relatively in the vertical, horizontal and circumferential directions. And a ring that can be divided into a plurality of circumferential portions of the connecting portion, and the upper and lower end plates arranged in contact with each other at a predetermined interval in the circumferential direction on the peripheral wall. Since it is the structure which formed the fitting through-hole which a fitting convex part fits, the outer diameter of a joint part can be made into the same diameter as the outer diameter of a pile main body, or smaller than this. Therefore, when the pile is buried in the ground, the penetration resistance is not increased by the joint portion, and further, there is no gap between the pile and the ground, and an appropriate horizontal support force is ensured. Can do. In addition, since the connection structure is simple and construction is easy, various effects such as cost reduction can be achieved.

Hereinafter, the connection structure of the pile which concerns on this invention is demonstrated in detail based on embodiment shown to drawing. In the figure, reference numeral 1 denotes an upper pile having a connection portion 2 at the lower end, and the size of the pile diameter of the connection portion 2 is formed smaller than the size of the pile diameter of the upper pile 1 which is a pile body. Reference numeral 3 denotes an end plate attached to the end face of the connecting portion 2, and a plurality of engaging convex portions 4 are provided on the periphery at predetermined intervals, and the engaging convex portion 4 is an outer peripheral surface of the connecting portion 2. It is set as the structure which protruded radially from.

Reference numeral 5 denotes a lower pile having substantially the same configuration as the upper pile 1. That is, 6 is the upper pile 1
7 is an end plate mounted on the end surface thereof, and 8 is an engaging convex portion provided on the periphery of the end plate 7. And since the magnitude | size and shape of each of these parts are the same shape and the same magnitude | size as the thing of the said upper pile 1, respectively, the detailed description is abbreviate | omitted.

9A and 9B are annular grooves formed on the joining surfaces of the end plates 3 and 7, respectively, and an annular shear key 10 is installed in the annular grooves 9A and 9B by fitting, so that the lower pile 5 On the other hand, the upper pile 1 is configured to be connected on the same central axis without being displaced in the horizontal direction. In addition,
In the figure, reference numerals 11A and 11B denote connection fittings wound around the outer periphery of the connection portions 2 and 6 of the upper and lower piles 1 and 5, respectively.

12 is a ring for connecting the upper and lower piles 1 and 5 to be connected at the connecting portions 2 and 6, and the ring 12 is a ring component divided into two in the circumferential direction of the connecting portions 2 and 6. 1
2A and 12B, each of which is a common bolt hole formed in the connecting portions 13 and 14 by superimposing connecting portions 13 and 14 each having a mating structure in which both ring constituent members 12A and 12B are formed at both ends thereof. The ring 12 having an integral structure can be formed by tightening the bolts 15 screwed into the 13A and 14A.

Reference numeral 16 denotes a fitting through hole formed in the ring 12, and a plurality of holes are formed through the side wall at predetermined intervals along the circumference of the ring 12, and the upper and lower sides connecting the ring constituent members 12A and 12B. When covering the connecting portions 2 and 6 of the two piles 1 and 5 from the outside, the engaging convex portions 4 and 8 of the overlapped upper and lower end plates 3 and 7 are fitted through the fitting through holes 16. Combine. In this manner, the ring constituent members 12A and 12B are set in a state where the engaging convex portions 4 and 8 are inserted into the fitting through holes 16, and the ring 12 is formed into an integral structure by the above-described method in a scraped state. To do. By setting it as such a structure, the up-and-down both piles 1 and 5 to be connected are controlled so that they move relatively in the up-down direction, the horizontal direction, and the circumferential direction.

Next, the construction method of the joint structure of the pile having the above configuration will be described. The upper pile 1 is disposed above the lower pile 5 driven into the ground, and the end plate 7 attached to the end face of the connecting portion 6 of the lower pile 5 The end plate 3 attached to the end face of the connecting portion 2 of the upper pile 1 to be connected is made to face. Then, the position of the upper pile 1 is adjusted so that the engaging convex portions 4 formed on the end plates 3 of the upper pile 1 are aligned with the engaging convex portions 8 formed on the end plates 7 of the lower pile 5. To do. Thereafter, an annular shear key 10 is disposed between the both end plates 3, 7, and the annular groove 9 formed on the joining surface of each end plate 3, 7 by the annular shear key 10.
It arrange | positions so that it may each fit in A and 9B.

In this state, by lowering the upper pile 1 on the lower pile 5, the lower pile 5 and the upper pile 1 are fitted with the shear keys 10 in the annular grooves 9A and 9B of the end plates 3 and 7, respectively. The upper piles 1 and 5 are joined to the upper pile 1 on the lower pile 5 in a state in which the respective central axes coincide with each other. Next, the ring component 1
2A and 12B are arranged on the joints 2 and 6 of the upper and lower piles 1 and 5 from the outside, and the engagement convex portion 8 formed on the end plate 7 of the lower pile 5 and the engagement plate formed on the end plate 3 of the upper pile 1 The portions 4 and 8 in which the joint protrusions 4 are vertically overlapped are fitted into fitting through holes 16 formed on the side walls of the ring constituent members 12A and 12B, and the joint portions 2 of the upper and lower piles 1 and 5 are joined. , 6 is set so as to cover the outer periphery.

When the ring constituent members 12A and 12B set as described above are assembled by superimposing connecting portions 13 and 14 having a mating structure formed on both ends of the ring constituent members 12A and 12B, respectively, The bolts 15 are screwed into the bolt holes 13A and 14A formed in the portions 13 and 14, and the ring 12 having an integral structure is formed by tightening the bolts. Thereby, the shift | offset | difference to the up-and-down both piles 1 and 5 and an up-down, horizontal, and a pile circumferential direction is controlled relatively.

It is a disassembled perspective view of the joint structure of the pile which concerns on this invention. It is a half longitudinal section showing the 1st construction state of the invention. It is a half longitudinal section which shows the 2nd construction state of the invention. It is a perspective view which shows the assembly state of a ring. It is a half longitudinal section which shows the 3rd construction state of the invention. FIG. 6 is a cross sectional view taken along line VI-VI in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper pile 5 Lower pile 2,6 Connection part 3,7 End plate 4,8 Engaging convex part 9A, 9B Annular groove 10 Shear key 12 Ring 12A, 12B Ring component 13, 14 Connecting part 13A, 14A Bolt hole 15 bolt 16 fitting through hole

Claims (3)

  When a connecting portion having a diameter smaller than the pile diameter is formed at the end of the pile, the upper and lower piles to be connected are formed by attaching end plates having a plurality of engaging projections protruding from the peripheral edge to the end face of the connecting portion; A ring that is fitted to the outside of the connection portion of the upper and lower piles arranged in contact with the end plate and relatively restricts movement in the vertical, horizontal, and circumferential directions. A structure in which a through-hole for fitting is formed in which the upper and lower end plates, which are arranged in contact with each other at predetermined intervals in the circumferential direction, are fitted into the circumferential wall of the upper and lower end plates are fitted to each other. Pile joint structure characterized by that.   A configuration in which annular concave grooves for inserting shear keys are respectively formed on the joint surfaces of both end plates of the upper and lower piles to be connected, and the upper and lower piles are connected via annular shear keys inserted into the upper and lower annular concave grooves. The pile joint structure according to claim 1, wherein:   The ring that can be divided into a plurality of parts in the circumferential direction of the connecting portion is composed of a superposed portion in which the connecting portions at both ends thereof have a mating structure. The pile joint structure according to claim 1, wherein the pile joint structure is formed as follows.

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