TW201420845A - Weldless joint for piles - Google Patents

Abstract

To provide a weldless joint for piles having high flexural capacity and high shear capacity, and at the same time provided with a rotational torque transmission mechanism. Spherical shear members (31) are placed in shear member fitting holes (30) formed in the end fastenings (12) of two piles, rotational moment is transmitted and the shear resistance of a joint is enhanced by the mutual concavo-convex fitting between the two piles, arcuate plates (15) fitted over the outer peripheries of the end fastenings (12) to fix the piles together are used, arcuate inter-plate coupler fastenings (21) for coupling the arcuate plates together are provided with tapered dovetail grooves (22) having dovetail groove shapes in transverse cross section, the terminal outer surfaces of the arcuate plates are each provided with an arcuate inter-plate coupling protrusion (20); having a tapered dovetail shape that fits with the tapered dovetail grooves (22), the arcuate plates (15) adjacent to each other are coupled by inserting the arcuate inter-plate coupling protrusions (20, 20) into the tapered dovetail grooves (22), and both ends of the arcuate inter-plate coupler fastenings (21) are threadably fastened into the adjacent arcuate plates (15).

Description

Pileless joint

The present invention relates to a welded joint of a pile that is joined to each other without being welded by welding between the piles joined in the axial direction when the precast concrete pile or other piles are driven into the ground.

Generally, when the pile is driven into the ground, it is generally a method of joining the precast concrete pile of a predetermined length in the longitudinal direction according to the necessity and entering until the depth of the period, and the connection between the piles is by A method of joining the end faces of the precast concrete piles by welding the integrated metal end plates.

However, the connection method by the welding is based on the strength of the welding, and it is required to be highly skilled. However, the skilled person has not been skilled enough recently, and the pile-joining operation has a problem of being weathered because it is an outdoor work in the piling site. .

Therefore, in recent years, no welded joints that are not dependent on welding have been developed. In the conventional non-welded joint, as shown in Fig. 9, a cylinder in which the end fittings 2 and 2 of the two piles 1 and 1 which are connected to each other are fitted to each other is provided in the radial direction. a plurality of divided shapes of the arcuate pallet 3, at The groove-shaped ribs 5 and 5 which are formed in the inner circumferential surface of the arc-shaped pallet 3 are fitted to the outer peripheral surfaces of the both end fittings 2 and 2, and the arc-shaped pallet 3 is formed. A method of fixing the both end fittings 2, 2 by the bolt 6 has been developed (for example, Patent Document 1).

Further, the method of fixing the arc-shaped pallet described above is formed in the outer periphery of the end portion of the arc-shaped pallet 3 which is installed across the end fittings 2, 2 of the two piles 1, 1 as shown in Fig. 10 The arc-shaped inter-plate connecting projections 3a and 3a having the longitudinally-shaped shape are connected to the arc-shaped inter-plate connecting fittings 7 having the tapered rake grooves 7a of the cymbal type, and the arc-shaped brackets are used. The inter-board connecting projections 3a and 3a are fitted in the tapered surface groove 7a to slide the arc-shaped inter-plate connecting fittings 7, and the arc-shaped pallets 3 and 3 are moved closer to each other and connected thereto (Patent Document 2) ).

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2003-82656

[Patent Document 2] Japanese Laid-Open Patent Publication No. 2011-89302

In the conventional welded joint of the pile, the non-welded joint as shown in the above-mentioned FIG. 9 has a large number of bolts because it is an end fitting which is screwed to the upper and lower ends. A problem that requires most screwing operations.

Further, it is necessary to form a plurality of screw holes in the pile end fittings in advance, and in order to protect them, a hole having a corner hole for tool fitting is previously attached to the end surface, and the bolt is buried in the state, and the concrete is punched and removed. Although the steam is solidified, it is a problem that the bolts are buried in the screw holes and the holes are too cool, and some of the holes are buried in the bolts, so that it is impossible to remove them, and it is necessary to discard the entire pile.

As shown in Fig. 10, in the method of joining the arc-shaped pallets from the plate-like arc-shaped pallet-joining fittings, when a large bending moment acts on the joint portion, the joint fitting may be deformed and The shear resistance in the direction perpendicular to the axial direction is smaller than that of the pile body.

In the case where it is necessary to rotate the pile and drive it in, there is a problem that the torque is not sufficiently transmitted.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a welded joint of a pile, which uses a small number of members, has low cost and good workability, has high shearing endurance, and the transmitting mechanism of the rotating torque can also be held simultaneously. Have.

A feature of the invention of claim 1 which solves the above-mentioned conventional problems is a welded joint of a pile, which is provided with both end fittings which are joined to each other at the joint end portions of the piles a plurality of arc-shaped pallets that are fitted around the outer circumference, and a flange-shaped rib is integrally formed on an outer circumference of each of the end fittings, and the inner peripheral surface of the arc-shaped pallet is provided with the both end fittings a groove in which the ridges are fitted, by The ridges are fitted into the recesses, and the arc-shaped pallets are fitted to the outer circumferences of the two end fittings to connect the piles, and the joint surfaces of the two end fittings are respectively disposed at the end fittings. A shearing material fitting hole is formed at a position corresponding to each other between the joint surfaces on the concentric circle, and a spherical shearing material disposed across the joint surfaces is fitted between the two joint surfaces. Position the two shears in the fitting hole.

According to a second aspect of the invention, in the first aspect of the invention, the shearing material is a steel ball, and the shearing material fitting hole is a hemispherical shape in which the steel ball is fitted. The center position of the steel ball is at a height position of the surface of the two joint surfaces.

The invention of claim 3 is characterized in that, in addition to the configuration of the first or second aspect of the patent application, the outer surface of the arc-shaped pallet adjacent to each other is fixed to be fixed between the outer surfaces of the ends of the arc-shaped pallets adjacent to each other. A plate-shaped arc-shaped inter-plate connecting fitting that is connected between the arc-shaped pallets, and one of the upper and lower sides of the arc-shaped pallet is formed into a narrow conical shape and a cross-sectional groove-like shape. The tapered surface groove has an arc shape which is formed in a tapered shape of a tapered shape which is fitted into the tapered surface groove in each of the outer surfaces of the end portions of the arcuate pallet adjacent to each other. a projection for connecting between the inter-plates, wherein the arc-shaped inter-plate connecting projections are inserted into the tapered surface trenches, and the arc-shaped pallets adjacent to each other are connected by the arc-shaped inter-plate connecting fittings. Both ends of the arc-shaped inter-plate connecting fitting are screwed to the arc-shaped pallets adjacent to each other.

The non-welded joint of the pile of the present invention is the first item of the patent application scope, and is provided with a plurality of fittings that are joined to each other at the joint end portions of the piles, and is attached to the outer circumference of the pile. The arcuate pallet is integrally formed with the flange-shaped ribs on the outer circumference of each of the end fittings, and the inner peripheral surface of the arcuate pallet is provided with a groove in which the ridges of the both end fittings are fitted, A structure in which the arcuate brackets are fitted into the outer periphery of the both end fittings to connect the piles by fitting the two ribs into the groove, and the joint faces of the two end fittings are different A shearing material fitting hole is formed at a position concentric with the end fitting and corresponding to each other between the joint surfaces, and a spherical shearing material disposed across the joint surfaces is fitted to the two In the two shearing material fitting holes at positions corresponding to each other between the joint faces; when the shearing force in the horizontal direction acts on the joint portion, the force in the direction of relative movement in the horizontal direction becomes between the joint faces acting on the upper and lower sides The horizontal force is caused by the presence of a spherical shear material The action of converting to the vertical direction and moving away from the vertical direction is to be restrained by the arc-shaped pallet, and the shearing force is converted into a tensile force for the up-and-down direction of the arc-shaped pallet, and the shear stress is enhanced. And the rotational torque between the piles connected to the upper and lower sides is transmitted.

Further, the shearing material and the shearing material fitting hole are prevented from being relatively moved in the rotational direction by the fitting of the uneven portion, and the torque transmitting function is simultaneously added, and a multi-functional joint structure can be obtained by a few members. .

According to the second aspect of the invention, the shearing material is a steel ball, and the shearing hole fitting hole is formed in a hemispherical shape in which the steel ball is fitted, so that the center of the steel ball is at the two joint surfaces. Surface height position; Since the steel ball is fitted into the hemispherical shearing material fitting hole and the centering between the piles is connected to each other, even if there is some eccentricity during the joining operation of the pile, the steel ball and the hemisphere can be used. The fitting of the holes is automatically centered, and the integration of the shearing material fitting holes between the two joining faces is to engage the steel ball into the joint surface of the end fitting of the previously driven pile, by the upper side The end fitting of the pile is placed thereon and rotated, and at this time, the steel ball can achieve the function of the thrust bearing, and the relative angle correction operation in the circumferential direction between the upper and lower piles becomes easy.

According to a third aspect of the invention, the present invention provides a plate-shaped arc-to-plate inter-connecting fitting between the arc-shaped pallets adjacent to each other, and in the arc-shaped pallet-connecting fitting, One of the upper and lower sides is a tapered surface groove having a narrow conical shape and a cross-sectional shape, and each of the end portions of the arc-shaped pallets adjacent to each other has a fitting a projection for connecting between the arc-shaped pallets having a tapered shape of the tapered surface of the tapered surface, and the projections for connecting the two arc-shaped pallets are inserted into the tapered groove to be adjacent to each other The arc-shaped pallets are connected by the arc-shaped pallet-connecting fittings; it is not required to be screw-solided as is conventional, and since the components are lightweight, workability is good, and the piles can be completed in a short time. link.

And by screwing the two ends of the arc-shaped inter-plate joint fitting to the arc-shaped pallet; when the force in the bending direction is applied to the joint portion of the pile, the component forces which are apart from each other between the arc-shaped pallets are generated, so that both ends The force that is bent outward is applied to the joint between the arc-shaped pallets. At this time, the floating is prevented by the screwing, and the bending endurance of the joint between the arc-shaped pallets is not required to be increased, and the thinning can be formed. Lightweight and easy to use, and can be reduced towards the periphery of the pile Highlight the height.

1‧‧ ‧ pile

10‧‧‧ Pile body

11‧‧‧ steel pipe

12‧‧‧End fittings

12a‧‧‧ joint surface

13‧‧ ‧ ribs

15‧‧‧Arc plate

16‧‧‧ gap

17‧‧‧ Groove

19‧‧‧Flat Department

20‧‧‧With the protrusion between the arc-shaped pallets

20a‧‧‧ side of the end of the pallet

20b‧‧‧ the central side of the pallet

21‧‧‧Arc-shaped pallet connection fittings

22‧‧‧ Cone sulcus

25‧‧‧Bolt insertion hole

26‧‧‧Threaded holes

27‧‧‧ bolt

30‧‧‧Scissed material fitting hole

31‧‧‧Scissed material

[Fig. 1] A cross-sectional view showing an example of a welded joint of a pile of the present invention.

[Fig. 2] A longitudinal section view of the same as above.

[Fig. 3] A longitudinal sectional view showing a joining process between the end fittings without a welded joint shown in Fig. 1.

Fig. 4 is a cross-sectional view showing the connection structure between the arc-shaped pallets without a welded joint shown in Fig. 1.

[Fig. 5] Same as the front view.

[Fig. 6] An arc-shaped pallet having no welded joint shown in Fig. 1 is shown, (a) is an end view, and (b) is a plan view of the end.

[Fig. 7] An arc-shaped inter-plate joint fitting without a welded joint shown in Fig. 1 is shown, (a) is a front view, and (b) is a plan view.

[Fig. 8] A view showing the action of the spherical shearing material in the welded joint of the pile shown in Fig. 1.

[Fig. 9] A longitudinal sectional view showing an example of a conventional example.

[Fig. 10] A partial perspective view showing another conventional example.

Embodiments of the invention are now described in accordance with the illustrated embodiments. This embodiment is shown to implement the welded joint of the pile of the present invention at The case of the joint of precast concrete piles.

In the figure, reference numeral 10 denotes a pile body, 11 denotes a steel pipe which is surrounded by the outer periphery of the pile body 10, and 12 is an end fitting integrally formed at an end portion of the pile body 10.

The end fitting 12 is formed in a circular plate shape, and its outer side surface is a joint surface 12a. In the end fitting 12, the end portion of the PC tensioning material for prestressing introduction in the insertion pile body 10 is fixed without being shown in the drawing.

In each of the upper and lower joint faces 12a and 12a, a plurality of shearing material fitting holes 30, 30, ... which are concentric with the end fitting 12 and are arranged at predetermined intervals are formed. The shearing material fitting hole 30 is formed at a position where it is integrated with each other between the end fittings 12 and 12 joined up and down.

The spherical shearing material 31 between the upper and lower end fittings joined to each other is fitted into the upper and lower shearing material fitting holes 30, 30.

The shearing material fitting hole 30 is a hemispherical shape in which the shearing material 31 forming a spherical shape can be fitted, and the shearing material 31 is a steel ball. In addition to the hemispherical shape, the shearing material fitting hole 30 may have an opening diameter that matches the diameter of the shearing material 31 and a depth at which half of the shearing material 31 is fitted.

By joining the spherical shearing members 31 with the joining faces 12a of the end fittings 12 therebetween, the shearing resistance between the joining faces can be exerted, and the torque transmitting action between the joining faces can be taken.

The flange-like rib 13 is integrally formed on the outer periphery of the tip end of the end fitting 12, and the upper and lower concrete piles 1 and 1 are joined up and down. The ridges 13 and 13 on the outer circumference of the both end fittings 12 and 12 are protruded toward the outer periphery of the joint portion in a state in which they are overlapped. The arcuate pallet 15 is attached to the outer periphery of the joint portion.

The arcuate pallet 15 has a shape in which the cylindrical ring is divided into three in the circumferential direction, 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 three arc-shaped pallets 15 are provided. When the 15 and 15 are fitted to the outer periphery of the end fitting 12, the length in the arc direction is a gap 16 which is capable of absorbing an interference amount at the time of tightening which will be described later.

A groove 17 is formed in the inner peripheral surface of the arcuate plate 15, and when the joint faces 12a and 12a of the end fittings 12 and 12 of the piles 1 and 1 connected to each other are joined to each other in a uniform manner, the outer periphery of the joint portion is formed. The protruding ribs 13, 13 can be fitted (shown in Fig. 2).

In the outer side surface of the end portion of the arcuate pallet 15, the arcuate pallets 15, 15, 15 adjacent to each other are fitted in a state in which they are fitted around the outer periphery of the end fittings 12, 12. Plane portions 19 and 19 which are disposed on the same plane as each other are formed on the outer peripheral surfaces of the end portions of the arcuate pallets 15 and 15 adjacent to each other (as shown in Figs. 4 and 6).

In the flat portions 19 and 19, the outer peripheral surfaces of the end portions of the arcuate pallets 15 and 15 are formed to have a shape in which the arc-shaped inter-plate connecting projections 20 and 20, which will be described later, are left and cut in a plane.

The arc-shaped inter-plate connecting projections 20 and 20 are connected to each other by the arc-shaped inter-plate connecting fittings 21, and the outer surfaces of the two arc-shaped pallet connecting projections 20 and 20 are provided. The way they are on the same plane, the outside is formed into a plane.

The arc-shaped inter-plate connecting projections 20 and 20 are in a state in which the end faces of the arc-shaped pallets 15 and 15 adjacent to each other face each other, and the upper side is formed into a narrow longitudinal direction and a cross section is as follows. In the first and second figures, the half-cut shape in which the 榫 type is divided into two is formed.

In other words, the end surface 20a of the end portion of the arc-shaped inter-plate connecting projection 20 is parallel to the pile axis, and the upper side of the center side surface 20b of the pallet is tapered at the end side of the pallet, and the surface side of the projection is A 榫 type which is wider than the surface of the blade, that is, the root of the protrusion, is formed. Thereby, the pair of upper sides are formed into a narrow tapered shape by the arc-shaped inter-plate connecting projections 20 and 20 which are adjacent to each other, and the two tapered surfaces are formed in a wide shape on the surface side of the projection.

The arc-shaped inter-plate connecting fitting 21 has a flat plate shape as a whole, and a tapered surface of the pair of arc-shaped inter-plate connecting projections 20 and 20 which are formed into a tapered shape is formed on the back surface thereof. The groove 22 is inserted into the tapered surface groove 22 by sliding the arc-shaped inter-plate connecting fitting 21 from the upper side of the arc-shaped inter-plate connecting projections 20 and 20 so as to be horizontally formed on the tapered surface. The force is applied in a direction in which the two arc-shaped inter-plate connecting projections 20 and 20 are moved closer to each other and connected therebetween.

In this manner, the three arc-shaped pallets 15 are connected to each other by the three arc-shaped pallet connecting fittings 21 between the ends of the three arc-shaped pallets 15 arranged in a circular shape. The two end fittings 12 and 12 are connected.

In the both end portions of the arc-shaped inter-plate connecting fitting 21, the bolt insertion holes 25 are open through the front and back, and at the flat portions 19 at both ends of the arc-shaped pallet 15, in the aforementioned arcuate pallet 15, 15 close links a screw hole 26 is formed at a position where the bolt insertion hole 25 is integrated, and a bolt 27 for sewing is inserted into the screw hole 26 in the bolt insertion hole 25, and the arc plate 15 is screwed by the screw. 15 and the arc-shaped inter-plate joint fittings 21 are fixed to each other.

As shown in Fig. 3, the connection work of the piles 1 and 1 by the welded joints thus formed is performed by first inserting the lower pile 1 and fitting the spherical shear material 31 into the same. The re-fitting hole 30 is cut on the joint surface 12a of the end fitting 12 at the upper end. Thereby, the shearing material 31 is fitted in a state in which the half thereof is protruded toward the joint surface 12a.

Next, the upper joint surface 12a is abutted against the upper portions of the shearing materials 31, 31, ..., and after about the centering operation between the two piles, the upper pile 1 is rotated, and the sheared material is cut. When the 31-position is placed under the shearing material fitting hole 30 of the upper joint surface 12a, the two are fitted, and the correct centering is automatically performed, and the relative movement of the upper and lower piles in the outer circumferential direction is also prevented.

In this manner, the three arc-shaped pallets 15, 15, 15 are annularly formed by joining the piles 1, 1 and arranging the outer edges of the joint portions thereof in a ring shape. In the manner of fitting, the arc-shaped inter-plate connecting projections 20 and 20 of the adjacent arc-shaped pallets 15 and 15 are slidably fitted to the tapered inter-plate connecting fitting 21 to be fitted to the tapered surface thereof. In the groove 22, the arc-shaped pallets 15, 15 can be screwed and fixed toward each other. The sliding operation of the connecting member 21 between the arc-shaped pallets is performed using a hydraulic jack.

Next, the bolt insertion hole 25 of the joint fitting 21 between the arc-shaped pallets is screwed into the arc-shaped pallets 15, 15 by inserting the bolts 27 for sewing. The screw holes 26 are screwed to fix the arc-shaped pallets 15, 15 and the arc-plate inter-connecting fittings 21 to each other.

In the welded joint of the pile thus constructed, as shown in Fig. 8, if the shearing force in the horizontal direction acts on the joint portion, the force a in the direction of relative movement in the horizontal direction acts on the upper and lower joint faces 12a, Between 12a, the force a in the horizontal direction is converted into the force b in the vertical direction by the presence of the spherical shearing material 31, and the action of the upper and lower end fittings 12 and 12 to be moved away in the vertical direction at this time is The arc-shaped pallet 15 is restrained, and the shearing force is converted into a tensile force in the vertical direction of the arc-shaped pallet, and a large shearing resistance is exerted.

In the above-described example, the arcuate pallet 15 is formed in a shape divided into three in the circumferential direction of the cylindrical ring, but may be formed in another plural divided shape. The end fitting 12 is formed of a flat plate-shaped plate material, but various other shapes such as a skirt portion made of a steel cylinder between the back surface of the end fitting and the steel pipe 11 can be used.

10‧‧‧ Pile body

11‧‧‧ steel pipe

12‧‧‧End fittings

12a‧‧‧ joint surface

13‧‧ ‧ ribs

15‧‧‧Arc plate

17‧‧‧ Groove

21‧‧‧Arc-shaped pallet connection fittings

25‧‧‧Bolt insertion hole

26‧‧‧Threaded holes

27‧‧‧ bolt

30‧‧‧Scissed material fitting hole

31‧‧‧Scissed material

Claims (3)

A non-welded joint of a pile, comprising: a plurality of arc-shaped pallets that are joined to each other at a joint end portion of each of the joint ends of the piles, and are fitted around the outer periphery thereof, and the flange-shaped ribs are integrated a groove formed on the outer circumference of each of the end fittings and having the ridges of the both end fittings fitted to the inner peripheral surface of the arcuate pallet, and the two ribs are fitted in the groove The arc-shaped pallet is fitted into the outer periphery of the two end fittings to connect the piles, and the joint surfaces of the two end fittings are respectively disposed on the concentric circle with the end fittings. A shearing material fitting hole is formed at a position corresponding to each other between the joint surfaces, and a spherical shearing material disposed across the joint surfaces is fitted to the two shearing positions at positions corresponding to each other between the joint surfaces Broken material fits into the hole. The non-welded joint of the pile according to the first aspect of the invention, wherein the shearing material is a steel ball, and the shearing material fitting hole is a hemispherical shape in which the steel ball is fitted, so that the steel ball is The center position is at the height position of the aforementioned two joint surface. A non-welded joint of a pile according to claim 1 or 2, wherein the arc-shaped pallet is interposed between the outer ends of the arc-shaped pallets adjacent to each other adjacent to each other. Connected plate-shaped arc-shaped inter-plate joint fittings, connecting the fittings between the arc-shaped pallets, and having either side of the upper and lower sides is a tapered surface groove having a narrow conical shape and a cross-sectional shape in a sulcus shape is formed, and each of the end portions of the arc-shaped pallets adjacent to each other has a tapered surface to be fitted to the tapered surface groove By inserting the two arc-shaped inter-plate connecting protrusions into the tapered surface sulcus, the arc-shaped pallets adjacent to each other are connected between the arc-shaped pallets adjacent to each other. The arc-shaped pallets are connected to each other by a fitting, and both end portions of the arc-shaped pallet-connecting fittings are screwed to the arc-shaped pallets adjacent to each other.