JP5954679B2 - Pile-free welded joint - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a non-welded joint for piles that connect piles joined together 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-welding joints that do not rely on welding have been developed in recent years. In this conventional non-welded joint, as shown in FIG. 7, a cylinder fitted to the outer periphery of both piles 1, 2 to be connected to each other across the piles 1, 2 is connected in the radial direction. 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 of fixing the arc-shaped plate described above, as shown in FIG. 8, the outer peripheral surface 3a of the arc-shaped plate 3 mounted across the end fittings 2 and 2 of both piles 1 and 1 is tapered in the pile axial direction. A fixing ring 7 having a tapered inner peripheral surface 7a is fitted on the outer periphery thereof, and the fixing ring 7 is relatively moved in the direction in which the arc-shaped plate is reduced in diameter by the taper. Have been developed (for example, Patent Document 2).

JP 2003-82656 A JP 2009-191522 A

  In such a conventional unwelded joint for piles, the unwelded joint having the structure shown in FIG. 7 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.

  Further, as shown in FIG. 8, in the case of a non-welded joint in which a ring is fitted on the outer side of the arc-shaped plate, the outermost ring of the joint becomes thicker in accordance with the diameter of the pile, and a predetermined diameter. Since width and proof strength are required, its weight increases, and the ring is pre-fitted to the pile before joining the pile, and this state is maintained and the upper and lower piles are joined and arc-shaped plates are attached, After that, a process of moving the ring was necessary, and the workability was extremely poor. In addition, since it handles heavy objects, there is a problem that the work is dangerous.

  Thus, in view of the conventional problems, the present invention has been made for the purpose of providing a non-welded joint for a pile that uses few members, is low in cost, has good workability, and provides high connection strength.

  The feature of the present invention for solving the conventional problems as described above and achieving the intended purpose is that it is wound around the outer periphery of both ends of the joint end of each pile to be connected to each other. A plurality of arc-shaped plates that are fitted together, and a flange-like ridge is integrally provided on the outer periphery of each end fitting, and a groove in which the ridges of the both-end fittings are fitted on the inner peripheral surface of the arc-shaped plate. The arc-shaped plates adjacent to each other in a non-welded joint of piles in which the two convex strips are fitted in the concave grooves and the arc-shaped plates are fitted to the outer periphery of the metal fittings at both ends. A plate-shaped arc-shaped plate-to-plate connection fitting that connects the arc-shaped plates by fixing between the outer surfaces of the end portions of the plate, and the arc-shaped plate-to-plate connection fitting has a narrow tapered shape on either the upper or lower side. None, crossing Is provided with a tapered dovetail shaped like a dovetail, and the outer surface of each end of the arcuate plates adjacent to each other is connected to each other between the arcuate plates in the form of a vertically divided tapered dovetail that fits into the tapered dovetail groove Protrusions are provided, and the arc-shaped plate coupling protrusions are inserted into the tapered dovetail groove so that adjacent arc-shaped plates are connected by being drawn together by the arc-shaped plate-to-plate coupling fitting. Bolt insertion holes are opened through both ends of the taper dovetail from the tapered dovetail, and between the arc-shaped plates, the arc-shaped plates are attracted to each other by the arc-shaped plate-to-plate connecting metal. In the connected state, a screw hole is formed at a position aligned with the bolt insertion hole, and the bolt hole is inserted into the bolt insertion hole. Screwing, by tightening, in that the the respective arcuate plate and arcuate plate between the connecting fitting fixed to each other.

  A non-welded joint for piles according to the present invention includes a plurality of arc-shaped plates that are fitted around the outer periphery of the joints of the joint ends of the piles to be connected to each other and wound around the outer periphery thereof. A flange-shaped protrusion is integrally provided on the outer periphery of the metal fitting, and a groove is provided on the inner peripheral surface of the arc-shaped plate so that the protrusions of the both-end metal fittings are fitted, and the both protrusions are fitted in the groove. In the non-welded joint of the structure where the piles are connected by fitting and fixing the arcuate plate to the outer periphery of the metal fittings at both ends,

  A plate-shaped arc-shaped plate-to-plate connecting bracket for connecting the arc-shaped plates adjacent to each other is provided, and the arc-shaped plate-to-plate connecting bracket has a narrow tapered shape on either the upper or lower side, and a taper having a dovetail-shaped cross section. Protrusions for connecting between arc-shaped plates each having a dovetail groove, each of which is formed by vertically dividing a tapered dovetail shape that fits into the tapered dovetail groove, is provided on each outer surface of each end of the arc-shaped plates adjacent to each other. By inserting the projections for connecting the arc-shaped plates into the tapered dovetail grooves, the arc-shaped plates adjacent to each other are connected by the connecting metal fittings for the arc-shaped plates. It becomes unnecessary, and since the member is light, 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.

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 fragmentary cross-sectional view which shows an arc-shaped plate connection part same as the above. FIG. It is the sectional view on the AA line in 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. FIG. 2 shows an arc-shaped plate-to-plate coupling fitting of a non-welded joint shown in FIG. It is a longitudinal cross-sectional view which shows an example of the past. It is a longitudinal cross-sectional view which shows the other example of the past.

  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 composed of a circular plate-like end plate portion 12a and a cylindrical ring-shaped skirt portion 12b integrally formed on the outer peripheral portion of the back surface thereof. A flange-like ridge 13 is integrally formed on the outer periphery of the end of the end fitting 12.

  Reference numeral 15 denotes an arc-shaped plate having a shape obtained by dividing the weekly direction of the cylindrical ring into three parts, and an inner peripheral surface is formed in an arc shape having substantially the same curvature as the outer peripheral surface of the end fitting 12. When the arc-shaped plates 15, 15, 15 are fitted to the outer periphery of the end fitting 12, the arc-shaped length is formed so as to create a gap 16 that absorbs a tightening margin at the time of tightening described later.

  On the inner peripheral surface of the arc-shaped plate 15, when the end fittings 12, 12 of the piles 1, 1 that are connected to each other are joined to each other in a butt arrangement, the adjacent ridges 13, 13 that are adjacent to each other are provided. Engaging grooves 17 (shown in FIG. 4) are 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. 2 and 5) 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 scraped flat, leaving the arc-shaped interplate connecting projections 20 and 20 described later.

  The arc-shaped plate connecting projections 20 and 20 are connected to each other by the arc-shaped plate connecting fitting 21 to be connected and fixed, and the outer surfaces of the arc-shaped plate connecting projections 20 and 20 are on the same plane. The outer surface is formed flat so as to be positioned.

  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.

  A bolt insertion hole 25 is opened through the front and back of each of the arc-shaped plate-to-plate connection fittings 21 at both ends of the tapered dovetail groove 22. The arc-shaped plates 15, 15 described above are formed in the flat portions 19 at both ends of the arc-shaped plate 15. In a state where the bolts are pulled and connected, 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. The arc-shaped plates 15 and 15 and the arc-shaped plate connecting bracket 21 are fixed to each other.

  In addition, the slide operation with respect to the projection 20 for connection between the arc-shaped plates of the connection member 21 between the arc-shaped plates is performed using a hydraulic jack.

DESCRIPTION OF SYMBOLS 10 Pile main body 11 Steel pipe 12 End part metal part 12a End plate part 12b Skirt part 13 Projection 15 Arc-shaped plate 16 Gap 17 Groove 19 Flat part 20 Arc-shaped inter-plate connection projection 20a Plate end side 20b Plate center side 21 Between arc-shaped plates Connecting bracket 22 Taper dovetail groove 25 Bolt insertion hole 26 Screw hole 27 Bolt

Claims (1)

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 plate-shaped arc-shaped plate-to-plate connection fitting that connects between the arc-shaped plates by fixing between the outer surfaces of the ends 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 attracted and connected by the connecting member between the arc-shaped plates,
The arc-shaped plate-to-plate connection fittings have bolt insertion holes penetrating through the tapered dovetail grooves at both ends, and each arc-shaped plate has a gap between the arc-shaped plates at the arc-shaped plate-to-plate connection fittings. A screw hole is formed at a position aligned with the bolt insertion hole in a state of being pulled and connected to each other, and a bolt is inserted into the bolt insertion hole, screwed into the screw hole, and tightened to Non-welded joint for piles, characterized in that the arc-plate connecting brackets are fixed to each other.

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