JP6893614B2 - Steel pipe joint structure - Google Patents

Description

The present invention relates to a steel pipe pile joint structure for joining an upper steel pipe pile and a lower steel pipe pile of a steel pipe pile or a pile-shaped ground reinforcement body.

In order to reinforce soft ground, steel pipe piles are increasingly driven deep into the ground. The replenishment of steel pipe piles is joined by using a mechanical joint that can more easily replenish steel pipe piles without the need for connection by welding between the ends of steel pipes or on-site welding.

Welding connection at the site is troublesome, and there are problems such as unstable quality due to the environment and weather at the site. In addition, there are few conventional mechanical joints that can handle all of the stress loads in the compression, twisting, pulling, and bending directions that occur during construction, and it takes time to assemble on-site and the price is high.

Patent Document 1 (Japanese Unexamined Patent Publication No. 2016-05060) passes through a truncated cone-shaped taper lock corresponding to a lock hole having six truncated cone-shaped lock holes communicating the lower steel pipe pile and the upper steel pipe pile. A steel pipe pile joint structure in which this taper lock is fixed with bolts, washers and nuts is disclosed.

Patent Document 2 (Japanese Unexamined Patent Publication No. 2006-144415) has an object of exerting a stronger resistance force against a twisting force as well as a bending force than before, and a rear end of a first steel pipe pile and a second steel pipe pile. In the steel pipe pile joint connecting the front end of the steel pipe pile joint, the first steel pipe pile joint is inserted into the second steel pipe pile joint, and two pairs of through holes provided at opposite positions in two directions orthogonal to each other in the radial direction are provided. There is disclosed a steel pipe pile joint in which a washer member is attached to this through hole and the washer members facing each other are fixed in a cross shape with one or more through bolts.

In Patent Document 3 (Japanese Unexamined Patent Publication No. 2005-105618 ), the upper pile and the lower pile can be easily jointed, and both the forward rotation of driving into the upper pile and the reverse rotation of pulling out can be reliably transmitted to the lower pile. In addition, the challenge is to ensure the rigidity of the joint between the upper and lower piles against bending, and the female joint is equipped with a circular guide hole and a rotary engaging female hole with a drum-shaped cross section, and the male joint is a drum. It is provided with a rotary engagement male part and an outer circular male part having a similar cross section, and the rotary engagement male part and the rotary engagement female hole part and the circular guide hole part and the outer circular male part are fitted, and the pin is fitted in the fitted state. The joint structure of the upper pile and the lower pile in the rotary press-fitting pile that is made to be inserted is disclosed.

JP-A-2016-050606 Japanese Unexamined Patent Publication No. 2006-144415 Japanese Unexamined Patent Publication No. 2005-105618

Since the above-mentioned joint mechanism does not require on-site welding, it has the effect of facilitating quality control of the joint and shortening the construction time. It is hard to say that it is sufficiently compatible with all loads, and in particular, it has a weakness in the durability of repeated torsional rotation in the forward and reverse directions.

Therefore, the present invention has a structure that can be attached and detached in a short time, can reliably transmit the press-fitting load and forward / reverse rotation torque of the upper steel pipe pile to the lower steel pipe pile, and bends that occur during construction. One of the issues is to provide a steel pipe pile joint mechanism that sufficiently copes with stress and pull-out stress.

In order to solve the above problems, when the inner surface joint (inner peripheral side joint) for the lower end of the upper steel pipe pile is inserted into the outer surface joint (outer peripheral side joint) of the lower steel pipe pile, the role of the stopper and the upper and lower contact surfaces A brim is made in the inner joint as a place where can be in close contact, and it can be inserted until this brim covers the upper end face of the outer joint without worrying about the insertion position of the parallel key, and the press-fitting load of the upper steel pipe pile is applied. It has become so that is without loss transferred to the lower steel pipe pile.

Concavo-convex grooves are provided on the outside of the inner surface joint and the inside of the outer surface joint. This uneven groove acts as a guide when the inner surface joint is inserted into the outer surface joint, and the joints can be easily inserted into each other, and the construction time can be significantly shortened. In addition, in the transmission of forward / reverse rotation torque, the end faces of the concave-convex groove surely come into contact with each other during forward / reverse rotation to form a shear surface and a bearing surface, and the forward / reverse rotation torque load of the upper steel pipe pile is reliably transmitted to the lower steel pipe pile. Will be done .

In addition, a parallel key is inserted into the outer surface joint at the lower end of the lower steel pipe pile so that the concavo-convex groove end surface of the inner and outer surface joints makes a reliable contact during forward and reverse rotation and becomes a shear surface and a bearing surface. There is a hole.

A parallel key groove and a female screw hole were machined in the wide convex part of the inner surface joint, and a rectangular parallel key insertion hole was machined in the wide concave part of the outer surface joint, and the parallel key was inserted so that it could be fixed to the inner surface joint with a hexagon socket head bolt.

According to the present invention, the inner surface joint welded to the upper steel pipe pile can be attached and detached in a short time by the brim and the uneven groove of the outer surface joint welded to the lower steel pipe pile, and is transmitted from the upper steel pipe pile. It has become possible to reliably transmit the rotational press-fitting load and rotational torque load to the outer surface joint of the lower steel pipe pile without loss.

In addition, the parallel key fixed to the inner surface joint with bolts greatly improved the pull-out strength and bending strength, and it was possible to have the same level of performance as the steel pipe performance used for steel pipe piles.

In addition, since the inner surface joint and the outer surface joint are not closely fixed, they can absorb seismic vibrations and can be expected to significantly improve seismic performance.

An embodiment is shown, and is a perspective view showing an inner surface joint, an outer surface joint, a parallel key, and a bolt in a separated state. The parts that make up the joint and the assembly image are shown. It is an image figure which the torsional torque of an inner surface joint and an outer surface joint is transmitted.

The steel pipe pile joint structure according to the present invention will be described with reference to the drawings.

The right figure of FIG. 1 is an image when the inner surface joint of the upper steel pipe pile and the outer surface joint of the lower steel pipe pile are factory welded and assembled at the site.

The figure on the right is a perspective view in which the inner surface joint (a) and the outer surface joint (b) are separated.

A brim portion 1 to be placed on the upper end surface 3 of the outer surface joint is attached to the upper part of the inner surface joint (a), and the press-fitting load of the upper steel pipe pile is applied to the lower steel pipe by the contact between this brim portion and the upper end surface 3 of the outer surface joint. It is transmitted to the pile and also acts as a stopper when inserting.

On the outside of the inner surface joint, there are 6 concave grooves (concave parts) 6 and convex grooves (convex parts) 7 having different widths. The concave groove 6 is the convex groove 7 of the outer surface joint, and the convex groove 7 is the outer surface joint. The groove end surfaces 5 and 9 of both joints come into contact with each other and transmit the rotational torque of the upper joint to the lower steel pipe pile.

The wide convex groove 4 of the inner surface joint has a key groove into which the parallel key (b) 1 is inserted, and a screw hole 2 for bolting the parallel key is machined in the center of the groove. The wide concave groove of the outer surface joint has a parallel key insertion hole 4 for inserting a parallel key, and when the inner surface joint is inserted into the outer surface joint, the parallel key insertion hole of the outer surface joint overlaps with the key groove hole of the inner surface joint. ..

The parallel key (b) 1 inserted into the insertion hole of the outer surface joint is inserted into the key groove 3 of the inner surface joint and tightened and fixed to the female thread portion 2 processed into the inner surface joint by the hexagon socket head cap screw 2. The parallel key inserted into the outer surface joint has a length that does not protrude to the surface of the outer surface joint. Further, the head of the hexagon socket head bolt 2 inserted into the parallel key also has a structure that fits in the bolt head storage hole 5 of the parallel key. This is because the structure does not hinder the peripheral friction coefficient of the steel pipe pile.

Outer surface joint keyhole (opening) is opening widely drilled rectangular circumferential direction than the keyway of the inner surface fitting. This parallel key that is bolted to the inner surface fitting which is welded to the upper steel pipe pile is a movement to the left and right in accordance with the rotation of the steel pipe pile, parallel key end face of uneven grooves in the inner surface fitting and outer joint with reliable contact This is to prevent the rotational torque load from being applied.

A welding groove 8 is machined on the end face of the inner surface joint, and a welding groove 6 is machined on the end face of the outer surface joint.

FIG. 2 is a diagram illustrating the concept of the outer surface and the inner surface of the joint when the joint is combined with the image of the parts constituting the inner surface and the outer surface joint. In assembling this joint, even an inexperienced worker can complete the assembly in about 30 to 60 seconds. Also, even after pulling out, the parallel key does not tighten the outer joint, so it can be easily removed.

FIG. 3 is an image diagram in which the torsional torque load transmitted from the inner surface joint is transmitted to the outer surface joint. This is an image in which the rotational torque load of the welded upper steel pipe pile of the inner surface joint is transmitted by the end face contact of the uneven groove of the inner surface joint and the outer surface joint. Further, as shown in the photograph, the parallel key insertion hole of the outer surface joint is wider than the key groove of the inner surface joint so that the end surface of the inner surface joint and the end surface of the outer surface joint can be reliably contacted.

(B) 1 Brim ring part of the inner surface joint (B) 2 Female thread part of the inner surface joint (B) 3 Parallel keyway hole of the inner surface joint (B) 4 Wide convex groove of the inner surface joint (B) 5 Concavo-convex groove end surface of the inner surface joint (B) 6 Concave groove of inner surface joint (B) 7 Concave groove of inner surface joint (B) 8 Weld groove machined part of inner surface joint (b) 1 Parallel key (b) 2 Hexagon socket head bolt (b) 5 bolt head Part storage hole (b) 3 Head end face of outer surface joint (b) 4 Parallel key insertion hole of outer surface joint (b) 6 Weld groove processing part of outer surface joint (b) 7 Convex groove of outer surface joint (b) 8 Outer surface Recessed groove in the fitting

Claims (4)

In the steel pipe joint structure for connecting the upper steel pipe and the lower steel pipe in the axial direction,
An annular inner peripheral side joint used by being attached to the lower end of the upper steel pipe, and a plurality of convex portions protruding outward in the radial direction from the outer peripheral surface of the inner peripheral side joint are axial directions of the inner peripheral side joint. A key groove is formed in at least one of the plurality of convex portions, and a first bolt receiver penetrating the inner peripheral side joint in the key groove in the radial direction is formed. An inner peripheral side joint having a hole and a ring-shaped brim formed along the peripheral edge of the upper surface of the inner peripheral side joint.
An annular outer peripheral side joint used by being attached to the upper end of the lower steel pipe, and a plurality of concave portions capable of engaging with the plurality of convex portions on the inner peripheral surface of the outer peripheral side joint are shafts of the outer peripheral side joint. An outer peripheral joint, which is formed to extend in the direction and has an opening formed in at least one of the plurality of recesses to penetrate the outer peripheral joint in the radial direction.
One or more parallel keys formed in a shape that can be fitted into the key groove, and one or more parallel keys formed with a second bolt receiving hole penetrating the inside of the parallel keys. ,
It is configured so that it can be fixed to the first bolt receiving hole through the second bolt receiving hole in a state where the tip portion of the parallel key passed through the opening is fitted in the key groove. A bolt having a length dimension larger than the depth dimension of the second bolt receiving hole,
With
When the inner peripheral side joint is moved axially with respect to the outer peripheral side joint and inserted into the inner peripheral side, the plurality of convex portions and the plurality of concave portions mesh with each other, and the key groove and the opening There, characterized in that it is configured to align in the radial direction of these joints, the steel KanTsugi hand structure. The lower steel tube so as to receive the press-fitting load, the flange portion of the inner peripheral side joint is configured to be supported on the upper surface of the outer peripheral side joint when the upper steel tube is rotated pressed characterized in that, the steel KanTsugi hand structure according to claim 1. The lower steel tube so as to receive the rotational force of the upper steel tube, the convex portion and the concave portion of the outer peripheral side joint of the inner peripheral side joint is formed when the upper steel pipe is rotated pressed wherein the steel KanTsugi hand structure according to claim 1. The steel pipe joint structure according to claim 1, wherein the key groove is a groove formed in a shape having a substantially quadrangular opening, and the parallel key is formed in a shape having a substantially rectangular parallelepiped shape.

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