WO2014080660A1

WO2014080660A1 - Non-welded joint for piles

Info

Publication number: WO2014080660A1
Application number: PCT/JP2013/066691
Authority: WO
Inventors: 坂村　博
Original assignee: 日本ヒューム株式会社
Priority date: 2012-11-22
Filing date: 2013-06-18
Publication date: 2014-05-30
Also published as: MY160497A; JP2014105430A; CN104797757A; TWI589753B; CN104797757B; KR20150081264A; HK1211638A1; JP5885107B2; TW201420844A; SG11201503007QA

Abstract

[Problem] To provide a non-welded joint for piles having high flexural strength and high shear capacity and also having a transmission mechanism for rotational torque. [Solution] Two piles are joined such that a shear ring (31) is interposed in shear ring inserting portions (30) formed on the end fittings (12) of both piles, and the moment of rotation is transmitted by the meshing of the recesses and protrusions. Arc-shaped plates (15) which are fitted on the outer circumference of the end fittings (12) in a bridging manner to fasten the piles are used. A tapered dovetail groove (22) with a dovetail groove-shaped horizontal cross section is provided on an arc-shaped plate connecting fitting (21) for connecting arc-shaped plates together. Arc-shaped plate connecting projections (20) are provided on the outer surfaces of the end parts of each arc-shaped plate, said projections (20) having tapered dovetail shapes which fit into the tapered dovetail groove (22). Adjacent arc-shaped plates (15) are connected by insertion of their respective arc-shaped plate connecting projections (20,20) into a tapered dovetail groove (22),and the end parts of the arc-shaped plate connecting fitting (21) thereof are screw-fastened to the adjacent arc-shaped plates (15).

Description

Pile-free welded joint

The present invention relates to a non-welded joint for piles that connect between piles joined in the axial direction without welding when precast concrete piles or other piles are built into the ground.

In general, when building ready-made piles in the ground, it is common to build precast concrete piles of a predetermined length to the desired depth while connecting them in the length direction as necessary. As for the connection between the piles, a method of connecting the metal end plates integrated with the end face of the precast concrete pile by welding is performed.

However, in this connection method by welding, the connection strength depends on the quality of welding and requires a high degree of skill, but recently there is a shortage of skilled engineers, and the pile connection work is an outdoor work at the pile driving site. Therefore, there is a problem that it depends on the weather.

For this reason, non-welded joints that do not rely on welding have been developed in recent years. In this conventional non-welded joint, as shown in FIG. 13, a cylinder fitted over the outer periphery of both

piles

1, 2 of both

piles

1, 1 to be connected to each other is radially arranged. A plurality of split arc-shaped plates 3 are provided, and flange-

shaped ridges

5 and 5 projecting from the outer peripheral surfaces of both

end fittings

2 and 2 are fitted into the concave grooves 4 formed on the inner peripheral surface of the arc-shaped plate 3. In addition, a method for fixing the arc-shaped plate 3 to the both

end fittings

2 and 2 with bolts 6 has been developed (for example, Patent Document 1).

Further, as a method for fixing the arc-shaped plate described above, a dovetail shape is vertically divided on the outer periphery of the end of the arc-shaped plate 3 mounted across the

end fittings

2 and 2 of both

piles

1 and 1, as shown in FIG. The arcuate plate-to-plate connecting projections 3a, 3a having the above-described shape are formed, and the plate-like arcuate plate-to-plate connecting metal fitting 7 having the taper dovetail groove 7a that fits into the dovetail shape is used. 3A, 3a are fitted together, and the arc-shaped plate-to-plate connecting fitting 7 is slid to connect the arc-

shaped plates

3, 3 while pulling each other (Patent Document 2).

JP 2003-82656 A JP 2011-89302 A

In such a conventional unwelded joint for piles, the unwelded joint having the structure shown in FIG. 13 described above has a large number of bolts because the arc-shaped plate is bolted to the upper and lower end fittings. There was a problem that a lot of work was required for the work.

In addition, it is necessary to form a large number of screw holes in the pile end fitting in advance, and in order to protect this, a hole-filling bolt having a square hole for tool fitting is attached to the end face, and in this state the concrete However, because it is in a harsh environment for screw holes and hole filling bolts, some hole filling bolts cannot be removed and the entire pile may have to be discarded. There was a problem.

As shown in FIG. 14, in the method of connecting the arc-shaped plates with the plate-shaped arc-shaped plate connecting metal fitting, when a large bending moment acts on the joint portion, the connecting metal fitting may be deformed and orthogonal to the axial direction. There was a problem that the shear strength in the direction was smaller than that of the pile body.

Also, when it was necessary to build the pile while turning it, there were problems such as insufficient torque transmission.

Thus, in view of the conventional problems, the present invention uses a small number of members, is low in cost and has good workability, has a high bending strength and a high shear strength, and has a rotational torque transmission mechanism at the same time. It was made for the purpose of providing a non-welded joint for piles.

The feature of the invention described in claim 1 for solving the conventional problems as described above is fitted in a winding arrangement on the outer periphery of both ends of the joint end portions of the piles to be connected to each other. A plurality of arc-shaped plates, and integrally provided with flange-shaped ridges on the outer periphery of each end fitting, and provided with concave grooves in which the ridges of the both-end fittings are fitted on the inner peripheral surface of the arc-shaped plate, In a non-welded joint of piles where the piles are connected by fitting the both ridges in a groove and fitting the arcuate plate to the outer periphery of the metal fittings at both ends,
A circular ring-shaped shear ring is provided on each of the joint surfaces of the metal fittings on both ends, each having a circular ring-shaped shear ring fitting portion concentrically arranged with the metal fittings on the both ends. Are provided on the bottom surfaces of the two shear ring fitting portions, and the convex portions are fitted on the upper and lower surfaces of the shear ring at positions corresponding to the convex portions of the bottom surface. A concave portion is integrally provided, and the convex portion on the bottom surface is fitted into the concave portion on the upper and lower surfaces of the shear ring, thereby preventing the relative movement in the circumferential direction between the shear ring and the metal fittings on both ends, thereby connecting the upper and lower sides. This is because the rotation moment between the piles is transmitted.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, a plate-like shape in which the arc-shaped plates are connected by being fixed across the outer surfaces of the end portions of the arc-shaped plates adjacent to each other. An arc-shaped plate-to-plate connecting bracket is provided, and the arc-shaped plate-to-plate connecting bracket includes a tapered dovetail having a narrow tapered shape on either side of the upper and lower sides, and has a dovetail-shaped transverse cross section. The outer surface of the end portion is provided with arcuate plate-to-plate connection projections each having a tapered dovetail shape that fits into the taper dovetail, and both the arcuate plate-to-plate connection projections are inserted into the taper dovetail groove. By connecting, the arc-shaped plates adjacent to each other are connected by the connecting member between the arc-shaped plates, and both ends of the connecting member between the arc-shaped plates are screwed to the adjacent arc-shaped plates. Located in.

A feature of the invention described in claim 3 is that, in addition to the configuration of

claim

1 or 2, the shear ring fitting portion is formed in a groove shape on the surface of the joint surface of the end fitting.

The feature of the invention described in claim 4 is that, in addition to the configuration of

claim

1 or 2, the angle between the inner peripheral edge surface of the end plate center opening in which the shear ring fitting portion is formed at the center of both end fittings and the joint end surface. This is because the circular ring-shaped shearing ring is fitted to the inner peripheral surface of the central opening of the end plate.

According to a fifth aspect of the present invention, in addition to the configuration of the third or fourth aspect, each shear ring fitting portion of the metal fittings at both ends is formed in a tapered shape whose bottom surface side is narrower than the joint surface opening portion side. The inner and outer peripheral surfaces of the shear ring are formed in a tapered shape whose upper and lower sides correspond to the respective shear ring fitting portions.

According to a sixth aspect of the present invention, in addition to the configuration of the first aspect, the shear ring is integrally projected on one side of the both end fittings, and the cross-section is a base having a narrow projecting end side. It is formed in a shape, and the shear ring is fitted on the other side of the both end fittings with a shear ring fitting portion formed in a shape corresponding to a trapezoidal shape of the shear ring integrated with the end fitting.

A plurality of non-welded joints of piles according to the present invention are fitted in a winding arrangement on the outer periphery of both ends of the joints of the piles to be connected to each other as described in claim 1. Each of the end fittings is provided with a flange-like protrusion integrally on the outer periphery of the end fitting, and an inner peripheral surface of the arc-shaped plate is provided with a recess groove in which the protrusions of the both end fittings are fitted. In the non-welded joint of the structure in which the piles are connected by fitting the both ridges inside and fitting and fixing the arc-shaped plate to the outer periphery of the both end fittings,
A circular ring-shaped shear ring is provided on each of the joint surfaces of the metal fittings on both ends, each having a circular ring-shaped shear ring fitting portion concentrically arranged with the metal fittings on the both ends. Are provided on the bottom surfaces of the two shear ring fitting portions, and the convex portions are fitted on the upper and lower surfaces of the shear ring at positions corresponding to the convex portions of the bottom surface. A concave portion is integrally provided, and the convex portion on the bottom surface is fitted into the concave portion on the upper and lower surfaces of the shear ring, thereby preventing the relative movement in the circumferential direction between the shear ring and the metal fittings on both ends, thereby connecting the upper and lower sides. The rotation moment between the piles is transmitted so that a shear ring is interposed between the end fittings of the piles that are to be connected to each other, so that the shear resistance in the direction perpendicular to the axial direction is increased. , The strength of the joint portion is increased.

Furthermore, the shear ring and the shear ring fitting portion are prevented from relative movement in the rotational direction due to the fitting of the concavo-convex portion, the torque transmission function is added at the same time, and a multi-functional joint structure is formed by a small number of members. can get.

According to a second aspect of the present invention, there is provided a plate-shaped arc-shaped plate-to-plate connecting bracket for connecting the arc-shaped plates adjacent to each other, and the arc-shaped plate-to-plate connecting bracket has a tapered shape in which one of the upper and lower sides is narrow. A taper dovetail having a dovetail shape in cross section, and an outer surface of each end of the arc-shaped plate adjacent to each other is formed by vertically dividing a tapered dovetail that fits into the taper dovetail. Each of the arc-shaped plate connecting projections is provided, and the arc-shaped plate connecting projections are inserted into the tapered dovetail groove so that adjacent arc-shaped plates are connected by the arc-shaped plate connecting bracket. As a result, many screwing operations are not required as in the prior art, and since the members are lightweight, the workability is good and the piles can be connected in a short time.

In addition, since both ends of the arc-shaped plate connecting bracket are screwed to the arc-shaped plate, when a force in the bending direction is applied to the connecting portion of the pile, a component force is generated that causes the arc-shaped plates to separate from each other. The arc-plate connecting bracket is subjected to bending forces at both ends, but the lifting at that time is prevented by screwing, eliminating the need to increase the bending strength of the arc-plate connecting bracket and reducing the thickness. It can be molded, is lightweight and easy to handle, and the protrusion height to the outer periphery of the pile can be made small.

In the present invention, as described in claim 3, the shear ring fitting portion is formed in a groove shape on the surface of the joint surface of the end fitting, so that the shear ring fitting portion is formed in a disk-like end. The cutting of the metal fittings by a lathe and the formation of the shear ring can be easily carried out by the cutting of a circular ring material by a lathe.

In the present invention, as described in claim 4, the corner portion between the inner peripheral surface of the end plate center opening in which the shear ring fitting portion is formed at the center of both end fittings and the joint end surface is cut off stepwise. By forming the ring-shaped shear ring into the annular shape and fitting the circular ring-shaped shear ring to the inner peripheral surface of the end plate central opening, it is easy to form the shear ring fitting portion with respect to the end fitting.

In the present invention, as described in claim 5, each shear ring fitting portion of the metal fittings at both ends is formed in a tapered shape whose bottom surface side is narrower than the joint surface opening portion side, and the inner circumference of the shear ring Since the upper and lower surfaces are formed in a tapered shape corresponding to each of the shear ring fitting portions, the taper groove of the both end metal parts and the taper of the shear ring when joining the end metal parts of the upper and lower piles. Depending on the shape, centering between the two piles is automatically performed, and high-precision joining between the piles is facilitated.

In the present invention, as described in claim 6, the shear ring is integrally projected on one side of the both end fittings, and the cross section is formed in a trapezoidal shape with a narrowed protruding end side, The shear ring is formed by fitting the shear ring on the other side of the both end fittings with a shear ring fitting portion formed in a shape corresponding to a trapezoidal shape of the shear ring integral with the end fitting. Since this is done by molding the end fittings, the number of manufacturing steps is reduced and the cost is reduced.

It is a cross-sectional view showing an example of a non-welded joint of a pile according to the present invention. It is a longitudinal cross-sectional view same as the above. It is a perspective view which shows an example of the shear ring used for this invention. It is a cross-sectional view of the connection structure between arc-shaped plates of the weldless joint shown in FIG. FIG. The arc-shaped plate of a non-welded joint shown in FIG. 1 is shown, (a) is an end view, and (b) is a plan view of the end. The arc-plate connecting metal fittings of the weldingless joint shown in FIG. 1 are shown, (a) is a front view and (b) is a plan view. It is a fragmentary sectional view which shows the shear ring fitting part and shear ring part of a pile joining process. It is a fragmentary sectional view showing other examples of the present invention. It is a fragmentary sectional view showing other examples of the present invention. It is a fragmentary sectional view showing other examples of the present invention. It is a fragmentary sectional view showing other examples of the present invention. It is a longitudinal cross-sectional view which shows an example of the past. It is a fragmentary perspective view which shows the other conventional example.

Next, embodiments of the present invention will be described based on the examples shown in the drawings. This example shows the case where the non-welded joint of the pile of the present invention is implemented for the connection of a precast concrete pile.

In the figure, reference numeral 10 is a pile body, 11 is a steel pipe covering the outer periphery of the

pile body

10, and 12 is an end fitting integrally provided at the end of the pile body 10.

The end fitting 12 is formed in a circular plate shape, and the outer surface thereof is a joining surface 12a. Although not shown in the drawing, the end fitting 12 is fixed with an end portion of a PC tendon for introducing prestress inserted into the pile body 10.

The upper and lower

joint surfaces

12a and 12a are formed with shear

ring fitting portions

30 and 30 made of concave grooves in a circular ring shape concentrically with the end fitting 12 at positions where they are aligned and face each other. A circular ring-shaped shear ring 31 is fitted in an arrangement straddling the

fitting portions

30, 30.

Each of the shear

ring fitting portions

30 and 30 is formed in a trapezoidal shape in which the cross section in the pile radial direction has a shape in which the width on the bottom surface side, that is, the groove bottom 30a side is narrowed and the groove release portion side is enlarged. 31 is a shape in which the cross section in the radial direction of the pile is formed by integrally stacking opposite trapezoids corresponding to the shearing

ring fitting portions

30 and 30 on the upper and lower sides with respect to the center in the height direction, that is, in the height direction It is formed in a taper shape with a taper on the top and bottom with respect to the center.

The upper and lower surfaces of the shear ring 31 are formed with

recesses

32, 32 each having a shape that is notched and recessed at a predetermined interval.

Convex portions

33, 33 that fit into the

concave portions

32, 32 are formed at the bottom of the shear

ring fitting portions

30, 30.

A state in which the relative movement in the circumferential direction between the two

end fittings

12 and 12 is prevented by fitting the convex portions 33 of the shear

ring fitting portions

30 and 30 of the two

end fittings

12 and 12 into the recess 32 of the shear ring 31. So that they can be joined together.

The outer periphery of the end fitting 12 is integrally formed with a flange 13 protruding in a flange shape from the outer periphery of the steel pipe 11, and the upper and

lower piles

1, 1 are joined up and down so The

protrusions

13 and 13 are projected on the outer periphery of the joint portion in a state of being overlapped. An arcuate plate 15 is mounted on the outer periphery of the joint.

The arc-shaped plate 15 has a shape obtained by dividing the circumferential direction of the cylindrical ring into three parts, and the inner peripheral surface is formed in an arc shape having substantially the same curvature as the outer peripheral surface of the end fitting 12, and the three arc-shaped plates 15 are formed. , 15 and 15 are formed in an arcuate direction length that creates a gap 16 that absorbs a fastening allowance at the time of fastening, which will be described later, when the end fitting 12 is fitted to the outer periphery.

On the inner peripheral surface of the arc-shaped plate 15, when the

end fittings

12, 12 of the

piles

1, 1 connected to each other are joined in a superposed arrangement, the protrusions projecting to the outer periphery of the joint portion A concave groove 17 (shown in FIGS. 2 and 6) into which the

strips

13 and 13 are fitted is formed.

The arcuate plates 15 adjacent to each other in a state where the

arcuate plates

15, 15, 15 adjacent to each other are wound around the outer periphery of the

end fittings

12, 12 are fitted to the outer surface of the end of the arcuate plate 15. Planar portions 19 and 19 (shown in FIGS. 4 and 6) are formed on the outer peripheral surface of the end portion 15 so as to be arranged on the same plane.

The

flat portions

19 and 19 have a shape in which the outer peripheral surfaces of the end portions of the arc-shaped

plates

15 and 15 are cut flat, leaving the arc-plate inter-plate connecting

projections

20 and 20 described later.

The arc-shaped plate-to-

plate connecting projections

20 and 20 are connected and fixed to each other by the arc-shaped plate-to-plate connecting fitting 21 and the outer surfaces of the arc-shaped plate-to-

plate connecting projections

20 and 20 are on the same plane. The outer surface is formed flat so as to be located at the position.

As shown in FIGS. 1 and 2, the arc-shaped plate-to-

plate connecting projections

20 and 20 have a vertically tapered shape with a narrow upper side and end surfaces of the adjacent arc-shaped

plates

15 and 15 facing each other. The ant shape is divided in half vertically.

That is, the arc-shaped interplate connecting projection 20 has a plate end side surface 20a parallel to the pile axis, and a plate center side surface 20b having a tapered shape with the upper side inclined toward the plate end side, That is, the protrusion surface side is formed in a wide dovetail shape from the protrusion root part. As a result, a pair of adjacent arc-shaped plate-to-

plate connecting projections

20 and 20 form a tapered shape whose upper side is squeezed, and both tapered surfaces are formed in a wide dovetail shape on the projection surface side.

The arcuate plate-to-plate connection fitting 21 is formed in a flat plate shape as a whole, and a tapered dovetail groove 22 into which the pair of arcuate plate-to-

plate connection projections

20 and 20 that are tapered as described above is fitted. By sliding the arcuate plate-to-plate connection fitting 21 from the upper side of the arc-shaped plate-to-

plate connection projections

20 and 20 and inserting it into the tapered dovetail groove 22, both horizontal component forces generated on the tapered surface are obtained. The arcuate plate-to-

plate connecting projections

20 and 20 are connected to each other while acting in the direction of pulling each other.

Thus, the three arc-shaped plates 15 are connected in a cylindrical shape by connecting the ends of the three arc-shaped plates 15 in a circular arrangement to each other by the three arc-shaped plate-to-plate connecting fittings 21 so that the ends of the two piles are connected to each other. The

brackets

12 and 12 are connected.

Bolt insertion holes 25 are opened through the front and back of both end portions of the arc-shaped plate connecting metal fitting 21 and the arc-shaped

plates

15 and 15 are drawn and connected to the flat portions 19 at both ends of the arc-shaped plate 15. In this state, a screw hole 26 is formed at a position aligned with the bolt insertion hole 25, and a bolt 27 for sewing is inserted into the bolt insertion hole 25, screwed into the screw hole 26, and tightened. And the arcuate plate-to-plate connecting bracket 21 are fixed to each other.

As shown in FIG. 8, the connection work of the

piles

1 and 1 by the non-welded joint configured in this way is built on the lower pile 1 first and formed on the joint surface 12a of the end fitting 12 at the upper end. A ring-shaped shear ring 31 is fitted to the shear ring fitting portion 30 that is formed.
At this time, the upper surface side of the shear ring 31 protrudes on the joint surface 12a in a state where the convex portion 33 at the bottom of the shear ring fitting portion 30 of the lower end fitting 12 is fitted in the concave portion 32 on the lower surface of the shear ring. It becomes a state.

Next, the upper surface of the shear ring 31 is fitted into the shear ring fitting portion 30 of the upper joint surface 12a so that the joint surface 12a of the lower end metal fitting 12 of the upper pile 1 is used as the end metal fitting of the lower pile 1. 12 joining surfaces 12a.
At this time, the shear ring fitting portion 30 has a narrow trapezoidal shape on the bottom surface 30a side, that is, a taper shape in which the joint surface opening portion side is wider than the bottom surface 30a, and the upper side of the shear ring 31 is correspondingly tapered. Therefore, misalignment of the dimensional difference between the joint surface opening portion width b1 of the shear ring fitting portion 30 and the tip end width b2 of the shear ring 31 between the

end fittings

12 and 12 joined to each other is allowed.
After the shear ring fitting portion 30 of the upper end fitting 12 is inserted into the upper surface side of the shear ring 31 in this manner, the upper pile 1 is moved to the position where the concave portion 32 and the convex portion 33 are aligned. Rotate in the direction. As a result, the concave and

convex portions

32 and 33 are fitted to each other, and the shear ring 31 is joined between the

end fittings

12 and 12 in a state in which the relative movement in the circumferential direction is prevented.
At the same time, when the

piles

1 and 1 are joined, the misalignment is corrected, and accurate centering is automatically performed and joined.

By joining the

piles

1, 1 in this way, the three arc-shaped

plates

15, 15, 15 are formed in a ring shape on the outer sides of the protruding

ridges

13, 13 that are superimposed on the outer periphery of the joint portion and project in an annular shape. The arc-shaped plate 15, the arc-shaped

plate connection projections

20, 20 of the adjacent arc-shaped

plates

15, 15 are fitted in the tapered dovetail groove 22 by sliding the arc-shaped plate connecting fitting 21. Fasten 15 to each other in the pulling direction and fix. The sliding operation of the arc-shaped plate connecting bracket 21 is performed using a hydraulic jack.

Next, a bolt 27 for sewing is inserted into the bolt insertion hole 25 of the arc-shaped plate-to-plate connection fitting 21, screwed into the screw hole 26 of the arc-shaped

plates

15, 15, and tightened, thereby connecting the arc-shaped

plates

15, 15 to the arc-shaped plate. The metal fittings 21 are fixed to each other.

In the example described above, the arc-shaped plate 15 has a shape obtained by dividing the circumferential direction of the cylindrical ring into three parts, but may be formed into other plural parts.

Moreover, although the shear ring fitting part 30 is formed in the taper shape in which the end-plate center opening width side is wide compared with the bottom face side, as shown in FIG. 9, the pile which made the end-plate center opening width side the same as shown in FIG. The radial cross section may be a square concave groove, and the same cross sectional shape of the shear ring 31 may be a square shape corresponding thereto.

Further, in the above-described example, the case where the shear ring fitting portion 30 is formed in the central portion of the radial width of the end fitting 12 having a disk ring shape (donut shape) is shown in FIG. As shown, the end plate 12 is formed in an annular shape in which the corners of the inner peripheral surface 12b of the end plate central opening formed at the center of the end fitting 12 and the joining end surface 12a are scraped off stepwise, and the inner peripheral surface 12b of the end plate central opening. Alternatively, the circular ring-shaped shear ring 31 may be fitted in the exposed arrangement.

Further, in the above-described example, the case where the shear ring 31 is formed as a completely separate body from the end fitting 12 is shown. However, as shown in FIGS. 12 and a structure in which a shear ring fitting portion 30 is formed only on the other end fitting 12.
Moreover, although the end metal part 12 has shown what was comprised with the flat ring-shaped board | plate material, the thing which interposed the skirt part which consists of steel cylinders between the back surface of the end metal part, and the steel pipe 11, etc. Various shapes can be used.

DESCRIPTION OF SYMBOLS 1 Pile 10 Pile main body 11 Steel pipe 12 End metal fitting 12a Joint surface 12b End metal inner peripheral surface 13 Convex strip 15 Arc-shaped plate 16 Gap 17 Groove 19 Planar portion 20 Arc-shaped inter-plate connection projection 20a Plate end side surface 20b Plate center Side surface 21 Inter-plate connecting bracket 22 Taper dovetail groove 25 Bolt insertion hole 26 Screw hole 27 Bolt 30 Shear ring fitting portion 30a Groove bottom 31 Shear ring 32 Recess 33 Convex portion b1 Joint surface opening portion width b2 of shear ring fitting portion Shear ring Tip width

Claims

A plurality of arc-shaped plates that are wound around the outer periphery of both ends of the joint end of each pile to be connected to each other and fitted in a winding arrangement are provided, and flange-like ridges are provided on the outer periphery of each end bracket. Provided integrally with a concave groove on the inner peripheral surface of the arc-shaped plate, and the convex ribs of the both end metal fittings fit into the arc-shaped plate. In non-welded joints of piles where the piles are connected by fitting to the outer periphery,
A circular ring-shaped shear ring is provided on the joint surfaces of the both end metal fittings, each having a circular ring-like shear ring fitting portion concentrically arranged with the end metal fittings, and straddling the two shear ring fitting portions of the joint surface. Intervene,
The bottom of each of the shear ring fitting portions is provided with a convex portion having a partially raised bottom surface, and a concave portion into which the convex portion is fitted at a position corresponding to the convex portion of the bottom surface on the upper and lower surfaces of the shear ring. Ready for one,
When the convex portion on the bottom surface is fitted into the concave portion on the upper and lower surfaces of the shear ring, the relative movement in the circumferential direction between the shear ring and the metal fittings on both ends is prevented, so that the rotational moment between the piles connected vertically is transmitted. A non-welded joint for piles that is characterized by
A plate-shaped arc-shaped plate-to-plate connection fitting that connects between the arc-shaped plates by being fixed across the outer surface of the end portions of the arc-shaped plates adjacent to each other,
The arc-shaped plate-to-plate fitting has a tapered dovetail with a narrow taper on either side of the top and bottom and a dovetail shaped cross section,
On the outer surface of each end portion of the arc-shaped plates adjacent to each other, each is provided with a projection for connecting between the arc-shaped plates in a shape obtained by vertically dividing a tapered dovetail that fits into the tapered dovetail groove,
By inserting the projections for connecting between the arc-shaped plates into the tapered dovetail grooves, the arc-shaped plates adjacent to each other are connected by the connecting member between the arc-shaped plates,
The pile-less welded joint according to claim 1, wherein both ends of the arc-shaped plate connecting fitting are screwed to adjacent arc-shaped plates.
The pile-welded joint according to claim 1 or 2, wherein the shear ring fitting portion is formed in a groove shape on the surface of the joint surface of the end fitting.
The inner peripheral surface of the end plate central opening is formed in an annular shape by scraping the corners of the inner peripheral surface of the end plate central opening formed at the center of both end fittings and the joining end surface into a stepped shape. The non-welded joint for piles according to claim 1 or 2, wherein the circular ring-shaped shear ring is fitted into the pile.
Each shear ring fitting part of the metal fittings at both ends is formed in a tapered shape whose bottom surface side is narrower than the joint surface opening part side, and the upper and lower sides of the inner and outer peripheral surfaces of the shear ring are the respective shear ring fitting parts. The non-welded joint for piles according to claim 3 or 4, which is formed in a tapered shape corresponding to the shape.
The shear ring is integrally projected on one side of the both end fittings, and the cross section is formed in a trapezoidal shape with a narrowed protruding end side, and the shear ring is formed on the other side of the both end fittings, The non-welded joint for piles according to claim 1, which is fitted to a shear ring fitting portion formed in a shape corresponding to a trapezoidal shape of a shear ring integrated with an end fitting.