JP2011089302A - Weldless joint for pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weldless joint for a pile at low cost, which uses a reduced number of members and has satisfactory working efficiency. <P>SOLUTION: This weldless joint for a pile includes a plurality of arcuate connection plates which are formed by radially dividing a cylinder, made to straddle over the metal fittings at both ends of piles to be connected to each other, and fitted to the outer peripheries thereof; and ribs and grooves which extend in the circumferential direction of the piles and which are fitted between the inner peripheral surface of the arcuate connection plate and the outer peripheral surfaces of the metal fittings at both ends. Inter-plate fixing projections are integrally provided to the outer surface of the arcuate connection plate at both ends. The weldless joint further includes fixing fittings for fixing the inter-plate fixing projections at the ends of the mutually adjacent arcuate connection plates. The two inter-plate fixing projections of the arcuate connection plates adjacent to each other are tapered in the pile axis direction, and the cross section thereof is formed in a dovetail form. The fixing metal fitting comprises a tapered dovetail groove to which the tapered dovetail form is fitted. The two projections adjacent to each other are fitted into the dovetail groove while sliding in the tapered direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

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, in recent years, non-welded joints not based on welding have been developed. In this conventional non-welded joint, as shown in FIG. 6, a plurality of cylinders that are fitted to the outer circumferences of both ends of the piles 1 and 2 of the piles 1 and 1 to be connected to each other are radially arranged. An arc-shaped connecting plate 3 having a split shape is provided, and flange-shaped ridges 5 and 5 projecting from the outer peripheral surface of both end fittings 2 and 2 are provided in the concave grooves 4 formed on the inner peripheral surface of the arc-shaped connecting plate 3 A method of fitting and fixing the arc-shaped connecting plate 3 to 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 connection plate described above, the outer peripheral surface 3a of the arc-shaped connection plate 3 mounted across both end fittings 2 and 2 is formed in a tapered shape in the pile axis direction as shown in FIG. A fixing method has been developed in which a fixing ring 7 having a tapered inner peripheral surface 7a is fitted to the outer periphery thereof, and the fixing ring 7 is relatively moved in a direction in which the arc-shaped plate is reduced in diameter by the taper. (For example, Patent Document 2).

JP 2003-82656 A JP 2009-191522 A

  In such a conventional non-welded joint of piles, the structure as shown in FIG. 6 described above is for bolting the arc-shaped connection plate to the upper and lower end fittings, so the number of bolts is large, and the bolting work is performed. There was a problem that a lot of work was required.

  Further, in the method of fitting the ring outside the arc-shaped connecting plate as shown in FIG. 7, the outermost ring of the joint has a larger diameter, especially when the pile diameter is larger, and has a predetermined width and strength. Therefore, the weight increases, workability is remarkably poor, and the ring needs to be fitted in advance to the outer periphery of one of the piles before joining the piles. .

  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 a small number of members and is low in cost and good in workability.

    The feature of the invention described in claim 1 for solving the conventional problems as described above and achieving the intended purpose is to fit both ends of the piles to be connected to each other on both outer circumferences. An arc-shaped connecting plate having a shape obtained by dividing a plurality of cylinders to be combined in the radial direction, and an uneven ridge in the circumferential direction of the pile that fits between the inner peripheral surface of the arc-shaped connecting plate and the outer peripheral surface of the both end fittings In an unwelded joint of piles where the piles are connected by fitting the arcuate connection plate across the metal fittings on both ends and fitting them to the outer periphery thereof,

  The arc-shaped connecting plate is integrally provided with an inter-plate fixing protrusion on the outer surface of the end portion, and is further provided with a fixing bracket for fixing the inter-plate fixing protrusions between the adjacent arc-shaped connecting plate ends. The two projections for fixing between the plates of the connection plate have a taper shape toward the pile axis direction and the cross section has a dovetail shape, and the fixing metal fitting has a taper shape in which the tapered dovetail shape fits. There is a dovetail groove, and the adjacent two projections are fitted in the dovetail groove while sliding in the taper direction so that the adjacent arc-shaped connection plates are connected to each other.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, each arc-shaped connection plate can be temporarily fixed to any one end fitting by a temporary fixing bolt.

  The feature of the invention of claim 3 is that, in addition to the configuration of claim 1 or 1, the taper of the interplate fixing protrusion and the dovetail groove of the fixing metal has a narrower width on the lower side than the upper side. It is in the shape.

  A non-welded joint of a pile according to the present invention includes an arc-shaped connection plate having a shape in which a plurality of cylinders that are fitted to the outer circumferences of both ends of the piles to be coupled to each other are radially divided. Between the inner peripheral surface of the arc-shaped connecting plate and the outer peripheral surface of the both-end metal fittings, there are provided ridges in the circumferential direction of the pile that fit together, and the outer circumference of the arc-shaped connecting plate straddling the both-end metal fittings. In the non-welded joint of piles where the piles are connected by fitting to

  The arc-shaped connecting plate is integrally provided with an inter-plate fixing protrusion on the outer surface of the end portion, and is further provided with a fixing bracket for fixing the inter-plate fixing protrusions between the adjacent arc-shaped connecting plate ends. The two projections for fixing between the plates of the connection plate have a taper shape toward the pile axis direction and the cross section has a dovetail shape, and the fixing metal fitting has a taper shape in which the tapered dovetail shape fits. By having a dovetail groove and fitting the two adjacent protrusions into the dovetail groove while sliding in the taper direction, the arc-shaped connection plates adjacent to each other are connected to each other. Many screwing operations are unnecessary, and the members are lightweight, so that workability is good and the piles can be connected in a short time.

  In addition, the present invention is such that each arc-shaped connection plate can be temporarily fixed to one of the end fittings with a temporary fixing bolt, so that the number of accidents in which the arc-shaped connection plate is accidentally dropped during operation is reduced. And the connection work between piles can be performed easily.

  Furthermore, according to the present invention, the taper of the dovetail groove of the fixing plate and the fixing metal has a shape in which the width on the lower side is narrower than the upper side, so that the fixing metal is relatively moved from the lower side to the upper side with respect to the interplate fixing protrusion. By moving, the arc-shaped connection plates act in the direction of pulling each other, that is, in the connecting direction. Therefore, when the pile is laid, the fixing bracket can be prevented from coming off due to friction with the ground surface.

It is a top view which shows an example of the non-welding joint of the pile which concerns on this invention. It is a front view same as the above. The exploded perspective view of the principal part same as the above It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line 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 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-shaped ridge 13 is integrally formed on the outer periphery of the end of the end fitting 12.

  Reference numeral 15 denotes an arc-shaped connection plate, which has a shape obtained by dividing the cylindrical ring into three parts, and has an inner peripheral surface formed into an arc shape having substantially the same curvature as the outer peripheral surface of the end fitting 12. When the plates 15, 15, 15 are fitted to the outer periphery of the end fitting 12, they are formed in an arcuate direction length that allows a gap 16 that can absorb an extension allowance when tightening to be described later.

  On the inner peripheral surface of the arc-shaped connection plate 15, the connecting fittings 12 of piles to be connected to each other are recessed grooves 17 (fitting the respective protruding ridges 13, 13 adjacent to each other when the front end surfaces thereof are joined in a butt arrangement. 4 and 5) are formed.

  Each arc-shaped connection plate 15 is formed with a bolt through hole at a position shifted to one of the upper and lower one side edge portions, and through this bolt through hole, a temporary fixing bolt 18 is formed into a screw hole formed in advance on the outer periphery of one end fitting. By screwing, the three arc connection plates 15 are temporarily fixed to one end fitting in a cylindrical arrangement as a whole.

  Inter-plate fixing protrusions 20 and 20 are integrally formed on the outer peripheral surfaces of both end portions of each arc-shaped connection plate 15, and the inter-plate fixing protrusions of adjacent arc-shaped connection plates 15 and 15 temporarily fixed in the cylindrical arrangement. 20 and 20 are connected and fixed while being pulled together by a fixing bracket 21.

  The two plate-to-plate fixing projections 20 and 20 of the arc-shaped connection plates adjacent to each other form a taper shape toward the pile axis direction, and the cross section has a dovetail shape as shown in FIGS. 1 and 3.

  That is, the inter-plate fixing protrusion 20 has a plate end side surface 20a parallel to the pile axis, and a plate center side surface 20b having a tapered shape whose lower side is inclined toward the plate end side and from the plate surface side. The protrusion surface side is formed in a wide dovetail shape. As a result, a pair of adjacent inter-plate fixing protrusions 20 and 20 form a tapered shape in which the lower side is squeezed, and both tapered surfaces are formed in a wide dovetail shape on the surface side.

  The fixing bracket 21 is formed in an arc shape along the outer peripheral surface of the arc-shaped connecting plate 15 in the width direction, and a tapered dovetail in which the pair of inter-plate fixing protrusions 20, 20 serving as the tapered dovetail shape described above fits on the inner surface thereof. A groove 22 is formed, and the fixing member 21 is slid from the lower side of the inter-plate fixing protrusions 20 and 20 and inserted into the tapered dovetail groove 22, thereby generating a horizontal portion generated on the tapered surface. A force acts between the two plate fixing projections 20 and 20 in a direction to draw them together, thereby connecting the two plates.

  In this way, the three arc-shaped connection plates 15 are connected to each other in a cylindrical shape by connecting the ends of the three arc-shaped connection plates 15 in a circular arrangement to each other by the three fixing metal fittings 21. 12 and 12 are connected.

  The sliding operation of the fixing bracket 21 with respect to the inter-plate fixing protrusion 20 is performed using a hydraulic jack, and when tightening with the hydraulic jack, the temporary fixing bolt 17 is removed or loosened.

  As shown in FIGS. 2 and 4, the retainer 21 attached in this manner is prevented from coming off by attaching an arc-shaped retainer 23 abutted against the bottom surface of the retainer to the bottom surface of the arc-shaped connection plate 15. By fixing with 24.

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 connection plate 16 Gap 17 Groove 18 Temporary fixing bolt 20 Interplate fixing protrusion 20a Plate end side surface 20b Plate center side surface 21 Fixing metal fitting 22 Tapered dovetail 23 Retaining bracket 24 Bolt

Claims (3)

An arc-shaped connection plate having a shape obtained by dividing a plurality of cylinders that are fitted to the outer circumferences of both ends of the piles to be connected to each other in the radial direction, and the inner peripheral surface of the arc-shaped connection plate and the both end portions Between the outer peripheral surfaces of the metal fittings, the pile circumferential projections and recesses that fit each other are provided, and the piles are connected by fitting the arc-shaped connecting plate across the metal fittings at both ends and fitting them to the outer circumference. In unwelded joints of piles,
The plate-like fixing protrusions are integrally provided on the outer surface of the end portion of the arc-shaped connection plate, respectively, and a fixing bracket for fixing the inter-plate fixing projections of the arc-shaped connection plate ends adjacent to each other is provided.
The two projections for fixing between the plates of the arc-shaped connection plates adjacent to each other form a taper shape toward the pile axis direction and the cross section has an ant shape,
The fixing metal fitting has a tapered dovetail groove into which the tapered dovetail fits, and the adjacent two projections are fitted in the dovetail groove while sliding in the taper direction. Non-welded joint for piles, characterized in that the arc connection plates are connected.   The pile-less welded joint according to claim 1, wherein each of the arc-shaped connection plates can be temporarily fixed to any one of the end fittings by a temporary fixing bolt.   The pile-less welding joint according to claim 1 or 2, wherein the taper of the dovetail groove of the interplate fixing protrusion and the fixing bracket has a shape in which the lower side is narrower than the upper side.

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