JPH08333743A - Joint structure of pile body - Google Patents

Abstract

PURPOSE: To ensure the extent of strength in the joining part of a pile body as well as to make both the connecting and embedding operations of this pile body easy enough. CONSTITUTION: A joint structure 18 consists of a connecting piece 19, where an annular ring is split in the radial direction, and a bolt 20 as a clamping member. A spot facing 23 in which a head part 22 of this bolt 20 is retractable is installed at the outer surface side of a through hole 21 installed piece by piece in four corners of this connecting piece 19. An inner surface 24 of the connecting piece 19 is formed into a nearly M-shaped section installed with a ring recess 25 and fitted in a ring projection 15 formed by both flange parts 13a and 14a, and further it is formed into being possible for face-contact with two side faces 26 and 27 of the joining part. Therefore, each connecting piece is individually installable in the joining part of a pile body with the clamping member, and thus efficiency in the connecting operation of the pile body is improvable.

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 Conventionally, when connecting piles such as concrete piles buried in the ground, a groove is formed in the outer periphery of the joint end of the two piles to be connected, and the opening is formed. Earlier, a welding technician connected the two piles by performing welding work. However, there is a risk of electric shock during welding work in poorly watered places or during rainfall, and in recent years a joint structure for piles without welding has been desired.

Then, a joint structure of a pile body without welding, as described in Japanese Utility Model Laid-Open No. 54-167511, was first proposed. In this joint structure, an annular two-piece connecting ring is attached to the joint of the pile, and the fastening body protruding outward from the connecting ring is tightened with bolts and nuts, so that the ends of both piles are connected to each other. Was linked. However, in this joint structure, since the fastening body is provided so as to protrude outside from the outer surface of the fastening ring, the fastening body becomes an obstacle when the pile body is embedded in the ground, and the work of embedding the pile body is performed. Is complicated.

[0004] Furthermore, when the fastening body protrudes outside from the outer surface of the fastening ring, there is a possibility that negative friction may occur. That is, the pile body is buried deeply until it reaches the underground rock layer, but friction occurs between the pile body and the stratum due to fluidization of the stratum such as ground subsidence. Therefore, if the fastening body protrudes, the pile body may be displaced in the vertical direction due to friction with the stratum, and there is a problem that the support structure of the pile body is weakened.

As an alternative to the above joint structure, a joint structure of a pile body using a tapered ring as shown in FIG. 5 has recently been known. As shown in FIG. 5, each pile 51, at each joint end of the upper pile 51 and the lower pile 52,
52 are provided with flange portions 51a, 52a protruding in the radial direction, and reinforcing bands 53, 5 are provided on side surfaces of the piles 51, 52.
4 is wound. Then, the pair of inner rings 55, each of which has a taper shape whose outer surface expands upward and which is formed into a semicircular shape by dividing the annular ring into two, is formed on both the piles 51,
52 is abutted so as to surround the joining portion. Thereafter, an annular outer ring 56 having a tapered inner surface extending downward is press-fitted from below the inner rings 55 by a hydraulic jack or the like (not shown). Then, the two piles 51 and 52 are connected by exerting a tightening force generated by the pressure contact force of the outer ring 56 against the tapered surface of the inner ring 55 in the axial direction of the pile body.

[0006]

However, in the joint structure of the pile body composed of the pair of semicircular inner rings 55 and the annular outer ring 56 as shown in FIG. 5, in the connecting work,
There were the following problems. In other words, when one worker abuts both inner rings 55 on the joint portion of the pile, another worker must keep the outer ring 56 at a position where it does not interfere with the abutment work. Did not. Thereafter, while the one operator keeps both inner rings 55 in contact with the joint portion of the pile body, another operator makes an outer ring 56.
Had to be pressed onto the outside of the inner ring 55.
For this reason, there is a problem that the connection work of the piles requires labor and time, and the work becomes complicated.

Further, since the outer ring 56 greatly extends from the side surface of each of the piles 51 and 52 toward the outside, there is a problem that it becomes an obstacle when the pile body is buried in the ground. Further, since the outer ring 56 is press-fitted into the tapered surface of the inner ring 55 from below, there is a possibility that the outer ring 56 may come off when an impact or the like is applied to the upper end of the outer ring 56 from above. There was also a problem that the strength of the joint was not guaranteed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a joint for a pile body in which the strength of a joint portion of the pile body is ensured and the connection and embedding operations of the pile body are easy. It is to provide a structure.

[0009]

In order to achieve the above-mentioned object, in the invention described in claim 1, in particular, the connecting member is composed of a plurality of connecting pieces divided in the radial direction of the pile body,
Each connecting piece can be individually screwed to the joint portion of the pile body by a fixing member.

In the invention described in claim 2, the connecting piece has an inner surface capable of surface-contacting the outer peripheral surface of the joint portion of the pile. In the invention according to claim 3, the fixing member is positioned closer to the axis of the pile than the outer surface of the connection piece in a state where the connection piece is screwed to the joint portion of the pile. did.

[0011]

According to the invention described in claim 1, each connecting piece is individually screwed to the joint portion of the pile body by the fixing member.

According to the second aspect of the invention, in addition to the operation of the first aspect, each of the connecting pieces is mounted in a state where the inner surface thereof is in surface contact with the outer peripheral surface of the joint portion of the pile body. According to the third aspect of the present invention, in addition to the operation of the first or second aspect, when each connecting piece is screwed to the joint portion of the pile, the fixing member is moved from the outer surface of the connecting piece. It does not protrude.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a concrete pile joint structure will be described below with reference to FIGS.

As shown in FIG. 2, end surface fittings 13 and 14 are fitted to the joint ends of the upper concrete pile 11 and the lower concrete pile 12, respectively. Flanges 13a and 14a are provided at the ends of the end face fittings 13 and 14, respectively, and an annular convex portion 15 is formed by the edges of the two flanges 13a and 14a that abut on each other. Also,
Reinforcing bands 16 and 17 are provided on the end faces 13 and 14 on the side opposite to the flanges 13a and 14a, respectively.

The joint structure described in this embodiment connects the joints of the two piles 11 and 12 described above. As shown in FIGS. 1 and 2, the joint structure 18 in the present embodiment includes a connecting piece 19 in which an annular ring having a predetermined thickness is divided in the radial direction, and a bolt 20 as a fixing member. A through hole 21 is provided at each of four corners of 19. A counterbore 23 capable of immersing the head 22 of the bolt 20 is provided on the outer surface of the connecting piece 19 of each through hole 21. Also, the inner surface 2 of the connecting piece 19
Numeral 4 is formed in a substantially M-shaped cross section provided with an annular concave portion 25, and can be fitted to the annular convex portion 15 formed by the two flange portions 13a, 14a.
3, 14 are formed so as to be able to make surface contact with side surfaces 26, 27.

Next, a method of using the joint structure 18 will be described with reference to FIGS. As shown in FIG. 2, first, end face fittings 13, 1 fitted to the piles 11, 12 are provided.
Bolt holes 28 corresponding to a plurality (four in this embodiment) of through holes 21 of the connecting piece 19 on the four side surfaces 26, 27.
To provide. Then, one connecting piece 19 is connected to both piles 11,
The annular convex portion 15 and the connecting piece 19 at the joint portion 12
The annular recessed part 25 is fitted, and the through hole 21 and the bolt hole 2
Attach so that 8 matches. Then, the one connecting piece 19 is positioned so as not to be displaced in the vertical direction of both piles 11 and 12, and the outer surface 29 of the connecting piece 19 and the outer surfaces of both the reinforcing bands 16 and 17 are substantially flush with each other.

Thereafter, the bolts 20 are inserted into the respective through holes 21 and fastened in the axial direction of the piles 11 and 12. Thereafter, similarly, as shown in FIG. 3, another connecting piece 19 is sequentially mounted on the outer peripheral surface of the joint portion between the two piles 11 and 12, and fastened and fixed with bolts 20. Then, each connecting piece 19 is individually attached to the joint portion of both piles 11 and 12.

As described above, in this embodiment, since the joint structure 18 is composed of a plurality of (six in this embodiment) connecting pieces 19, both piles 11 and 12 of each connecting piece 19 are operated by one worker. Can be easily carried out on the joint portion and the fastening operation of each connecting piece 19 by the bolt 20. Therefore, the efficiency of connecting the two piles 11 and 12 can be improved.

Further, since the gap between the connecting pieces 19 adjacent to each other is reduced and the connecting pieces 19 are fitted and fixed so as to surround the outer periphery of the joint portion of the piles 11 and 12, the piles 11 and 12 are fixed. The strength of the joint can be guaranteed.

Furthermore, the side surface 2 of each of the end surface fittings 13 and 14
6, 27 and the side surface of the joint portion composed of the annular convex portion 15 of each of the collar portions 13a and 14a, and the annular concave portion 25 of each connecting piece 19.
Since the inner surface 24 having the surface contact is in a surface contact state, each connecting piece 19 does not shift or come off from the joint portion between the piles 11 and 12. Also, each connecting piece 19
Are individually fastened by the bolts 20, so that the connecting pieces 19 do not easily come off the joint portion, and the strength of the joint portion can be ensured.

On the other hand, when the connecting pieces 19 are mounted, the bolts 20 for fastening the connecting pieces 19 are connected to each other.
Do not overhang outside of the outside surface of the. Therefore, when the piles 11 and 12 are embedded in the ground, the head 22 and the like of the bolt 20 do not get caught on the inner wall of the embedding hole, so that the efficiency of the embedding operation can be improved.

Next, the results of a joint bending test in which the bending strength of the joints of the piles due to the difference in the joint structure was measured will be described. This test is conducted in the following order. First, each end of the two piles on the unconnected side is supported and fixed in a horizontal direction at a predetermined height. After that, the deflection amount measuring device is placed on the upper surface of the joint portion of both piles. The bending amount measuring device is provided with a pair of displacement amount detecting sections, and each of the displacement amount detecting sections is brought into point contact with a position equidistant from the joint end face of both piles. Then, the load required to increase the amount of bending of the joint portion by 5 mm is measured.

Further, in this joint portion bending test, a steel pipe (609.6Φ ×) was used as the pile body instead of the concrete pile.
16t) and is based on JIS-A533. In this test, three types of joint structures, a conventional tapered ring joint structure, a conventional two-piece ring joint structure, and a joint structure in the present embodiment, were measured. The test results are shown in FIG. Show.

As shown in FIG. 4, that is, in the conventional tapered ring type joint structure, a load of 16 tons is required to bend the joint portion by 10 mm, and 31 tons is required to bend the joint portion by 20 mm. Is required. In the conventional two-piece ring type joint structure, a load of 17 tons is required to bend the joint portion by 10 mm, and a load of 28 tons is required to bend the joint portion by 20 mm. In the joint structure of this embodiment, a load of 21 tons is required to bend the joint portion by 10 mm, and a load of 42 tons is required to bend the joint portion by 20 mm.

From the above test results, it can be determined that the strength of the joint structure in this embodiment is excellent.
The present invention may be embodied as follows. (1) In this embodiment, the joint structure 18 is embodied by a concrete pile joint structure, but may be embodied by another pile body, for example, a joint structure of a steel pipe or the like.

In this case, the same effect as in the present embodiment can be obtained. Further, in this case, it is not necessary to provide an end face metal fitting at each joint end. (2) In the present embodiment, the connecting pieces 19 are embodied by six pieces, but the number may be arbitrarily changed as long as the circumference of the joint portion of the pile body can be surrounded.

Even in this case, the same effect as that of this embodiment can be obtained. (3) In this embodiment, the joint structure 18 is embodied as a joint structure corresponding to a concrete pile forming a cylindrical body.
The shape may be changed to a prismatic body, for example, an octagonal concrete pile.

In this case, the same effect as that of the present embodiment can be obtained. (4) In the present embodiment, the inner surface 24 of the connecting piece 19 has a cross section substantially M
Although it is formed in the shape of a letter, it may be arbitrarily changed as long as the shape is in contact with the outer peripheral surface of the joint portion of the pile so as to make surface contact.

Even in this case, the same effect as that of this embodiment can be obtained. Next, technical ideas other than the claims ascertained from the present embodiment will be described below together with their effects. (1) In the joint structure for a pile body according to claim 3, the connecting piece is provided with a through hole through which a fixing member is inserted, and a head of the fixing member is provided on an outer surface side of the connecting piece of the through hole. Joint structure of a pile body provided with a recess that can be immersed.

In this way, the fixing member does not hinder the burying work of the pile body, and the burying work efficiency can be surely improved.

[0031]

According to the invention described in claim 1, since each connecting piece can be individually attached to the joint portion of the pile body by the fixing member, the work efficiency of connecting the pile bodies can be improved. It

According to the invention of claim 2, claim 1
In addition to the effects of the invention described in (1), since the connecting piece does not easily come off from the joint portion of the pile, the strength of the joint portion can be reliably ensured.

According to the invention described in claim 3, according to claim 1
Alternatively, in addition to the effect of the invention described in claim 2, the efficiency of embedding the pile body can be improved.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a usage state of a pile joint structure.

FIG. 2 is a partially broken sectional view showing a use state of a joint structure of a pile body.

FIG. 3 is a cross-sectional plan view showing a use state of the joint structure of the pile body.

FIG. 4 is an explanatory view showing a bending test result of a joint portion of a joint structure of a pile body.

FIG. 5 is a partial cross-sectional view showing a usage state of a conventional joint structure for a pile body.

[Explanation of symbols]

11 ... upper concrete pile, 12 ... lower concrete pile, 13, 14 ... end face metal fittings, 13a, 14a ... flange,
15 ... annular convex part, 18 ... joint structure, 19 ... connecting piece, 20
... bolts as fixing members, 24 ... inner surfaces, 25 ... annular concave portions, 26, 27 ... side surfaces.

Claims (3)

[Claims] 1. A joint structure of a pile body, wherein a joint member is attached to a joint portion of both pile bodies whose ends are joined to each other so as to surround the joint portion, wherein the joint member has a diameter of the pile body. Composed of multiple connecting pieces divided along the direction,
A pile body joint structure in which each connecting piece can be individually screwed to a joint portion of the pile body by a fixing member. 2. The joint structure for a pile body according to claim 1, wherein the connection piece has an inner surface capable of surface contact with an outer peripheral surface of a joint portion of the pile body. 3. The fixing member is attached to a joint portion of a pile body,
The pile joint structure according to claim 1 or 2, which is located closer to the axial center of the pile than the outer surface of the connection piece when the connection piece is screwed.