JP2018178681A - Steel pipe pile joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe pile joint structure that securely transmits a pressing-in load and a normal-reverse rotational load occurring in construction work of steel pipe piles, and that includes sufficient rigidity for pulling and bending loads.SOLUTION: In a steel pipe pile joint structure joining the upper end of a lower steel pipe pile and the lower end of an upper steel pipe pile, when the convex part of an inner surface joint (I) of the upper steel pipe pile is inserted into the concave part of an outer surface joint (II) of the lower steel pipe pile, a flange 5 of the inner surface joint is joined to a flange contact part 3 of the outer surface joint in a loading manner and a parallel key slot 3 of the inner surface joint is fitted to a parallel key insertion hole 4 of the outer surface joint. A parallel key 5 in a cuboid shape is inserted into the fitting hole, and the parallel key is fixed to a female screw part 2 of the inner surface joint with a bolt 2. In addition, the parallel key, which is fixed to the inner surface joint, has a mechanism of moving in response to a rotation of the inner surface joint. This causes the concave and convex parts of inner and outer joints to securely contact with each other so that a rotational torque load is transmitted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steel pipe pile joint structure in which an upper steel pipe pile and a lower steel pipe pile of a steel pipe pile or a pile-like ground reinforcing body are joined.

  In order to reinforce soft ground, steel pipe piles are often drilled deep in the ground. The joining of the steel pipe piles is joined using a mechanical joint that can join the steel pipe piles more easily without requiring connection by welding of the steel pipe ends or field welding.

  In addition to the time-consuming welding connection at the site, there are problems such as unstable quality depending on the site environment and the weather. Moreover, in the conventional mechanical joint, there are few products which correspond to all the stress load such as compression, torsion, drawing and bending direction generated at the time of construction, and it takes time for assembling in the field, and the price is also high.

  Patent document 1 (Unexamined-Japanese-Patent No. 2016-050606) passes the truncated cone-shaped taper lock corresponding to a lock hole which has six truncated cone-shaped lock holes which connect a lower side steel pipe pile and an upper steel pipe pile. The steel pipe pile joint structure of the system which fixes this taper lock with a bolt, a washer, and a nut is disclosed.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-144415) has an object to exert a stronger resistance against a twisting force as well as a bending force as compared with the prior art, and the rear end of the first steel pipe pile and the second steel pipe pile The first steel pipe pile joint is inserted into the second steel pipe pile joint, and two pairs of through holes are provided at two opposing positions in two directions orthogonal to each other in the radial direction. There is disclosed a steel pipe pile joint of a type in which a washer member is attached to the through hole and the facing washer members are fixed in a cross shape with one or more through bolts.

  Patent document 1 (Unexamined-Japanese-Patent No. 2006-144415) can join a pile and a lower pile easily, and can certainly transmit both the driving | running forward rotation to an upper pile and drawing-out reverse rotation to a lower pile, In addition, the rigidity of the joints of the upper and lower piles against bending is a problem, and the female joint is provided with a circular guide hole and a rotary engaging female hole with a drum-shaped cross section, and the male joint is rotated with a drum-shaped cross section. An engaging male part and an outer peripheral circular male part are provided, and the rotary engaging male part, the rotary engaging female hole part, the circular guide hole part and the outer peripheral circular male part are fitted, and the pin is inserted in the fitted state It discloses a joint structure of upper and lower piles in a rotary press-fit pile that is being made.

JP, 2016-050606, A JP, 2006-144415, A JP, 2005-105618, A

  The joint mechanism described above has an effect that the quality control of the joint is easy and the construction time can be shortened since the on-site welding is not required, but compression, torsion, drawing and bending stress in construction etc. There is a point that it can not be said that it corresponds sufficiently to all load loads, and in particular there is a weakness in the durability of forward and reverse repetitive twisting rotation.

  For this reason, the present invention has a structure capable of reliably transmitting the press-fit load and forward and reverse rotational torque of the upper steel pipe pile to the lower steel pipe pile, which can be detached in a short time, and generates bending during construction. It is an object of the present invention to provide a steel pipe pile joint mechanism sufficiently corresponding to stress and drawing stress.

  In order to solve the above problems, when the inner joint for the lower end of the upper steel pipe pile is inserted into the outer joint of the lower steel pipe pile, the flange part is formed on the inner joint as a place where the role of the stopper and the upper and lower contact surfaces can be in close contact. It can be inserted until the flange part covers the upper end face of the external joint without worrying about the insertion position of the parallel key, and the press fit load of the upper steel pipe pile is transmitted to the lower steel pipe pile without loss. ing.

  An uneven groove is provided on the outside of the inner joint and the inner of the outer joint. The uneven groove serves as a guide when the inner surface joint is inserted into the outer surface joint, and the insertion of the joints can be easily performed, and the construction time can be significantly shortened. Further, in the transmission of the forward and reverse rotational torque, the end face of the concave and convex groove reliably contacts during the forward and reverse rotation, and the shear surface and the bearing surface are formed and the forward and reverse rotational torque load of the upper steel pipe pile is reliably transmitted to the lower steel pipe pile

  In addition, parallel key insertion so that the circumferential direction is a concavo-convex boundary surface in the external joint on the lower end of the lower steel pipe pile so that the concavo-convex groove end face of the inner and outer joints will contact reliably during forward and reverse rotation and become a sheared surface and a bearing surface. The hole is open.

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

  According to the present invention, the inner joint welded to the upper steel pipe pile can be attached and detached in a short time by the flange portion and the uneven groove of the outer surface joint welded to the lower steel pipe pile, and transmission from the upper steel pipe pile Can be transmitted to the outer joint of the lower steel pipe pile reliably without any loss.

  In addition, due to the parallel key fixed to the inner joint by bolts, the pullout resistance and the bending resistance were significantly improved, and the performance equivalent to that of the steel pipe used in the steel pipe pile was able to be obtained.

  In addition, since the inner and outer joints are not in a tightly fixed structure, it is possible to absorb earthquake vibration and the like, and significant improvement in seismic performance can also be expected.

It is an perspective view which shows embodiment and shows an inner surface coupling, an external surface coupling, a parallel key, and a bolt in a separated state. The parts that constitute the joint and the assembly image are shown. It is an image figure to which the twisting torque of an inner surface coupling and an external surface coupling is transmitted.

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

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

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

  At the upper part of the inner joint (a), there is a flange 1 to be placed on the upper end face 3 of the outer joint, and the contact of the flange and the upper end face 3 of the outer joint causes the press fit load of the upper steel pipe pile to be lower steel pipe It also acts as a stopper when it is transmitted to the pile and inserted.

  On the outside of the inner joint are six concave grooves 6 and convex grooves 7 having different widths. The concave grooves are inserted into the convex grooves 7 of the outer joint into the concave grooves 8, and the groove end faces of both joints 5, 9 contact and transmit the rotational torque of the upper joint to the lower steel pipe pile.

  The wide convex groove 4 of the inner joint has a key groove into which the parallel key 1 is inserted, and a screw hole 2 for bolting the parallel key is machined at the center of this groove. The wide groove of the outer joint has a parallel key insertion hole 4 for inserting a parallel key, and when the inner joint is inserted into the outer joint, the parallel key insertion hole of the outer joint overlaps with the key groove of the inner 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 fastened and fixed to the internal thread portion 2 processed into the inner surface joint by the hexagonal holed bolt 2. The parallel key inserted into the outer joint is of a length that does not project to the surface of the outer joint. Further, the head of the hexagonal socket bolt 2 inserted into the parallel key is also structured to be accommodated in the bolt head storage hole 5 of the parallel key. This is because the structure does not inhibit the peripheral friction coefficient of the steel pipe pile.

  The keyhole of the outer joint is a rectangular opening that is circumferentially wider than the keyway of the inner joint. This is the rotation of the steel pipe pile with the parallel key bolted to the inner joint welded to the upper steel pipe pile. In order to ensure that the end faces of the concave and convex grooves of the inner and outer joints are in contact with each other and the parallel key is not loaded with a rotational torque load.

  A weld groove 8 is formed on the end face of the inner joint, and a weld groove 6 is formed on the end face of the outer joint.

  FIG. 2 is a view schematically showing the concept of the outer surface and the interior of the joint when the image of the parts constituting the inner and outer joints and the joint are combined. With this joint assembly, even an inexperienced worker can complete the assembly in about 30 to 60 seconds. Also, even after being pulled out, the parallel key does not tighten the outer joint and can be easily removed.

  FIG. 3 is an image diagram in which the torsional torque load transmitted from the inner joint is transmitted to the outer joint. It is an image to which the rotational torque load of the welded upper steel pipe pile of an inner surface joint is transmitted by the end surface contact of the uneven groove of an inner surface and an external surface joint. Also, as shown in the picture, the parallel key insertion holes of the outer surface joint are processed wider than the key grooves of the inner surface joint so that the end faces of the inner surface joint and the outer surface joint can be reliably contacted.

(A) 1 Collar of inner surface joint (A) 2 Female thread of inner surface joint (A) 3 Parallel key groove hole of inner surface joint (A) 4 Wide convex groove of inner surface joint (A) 5 Irregular groove end face of inner surface joint (A) Recess 6 of inner surface joint (A) 7 Convex groove of inner surface joint (A) 8 Weld grooved portion of inner surface joint (B) 1 Parallel key (B) 2 Hexagon socket head bolt (B) 5 bolt head Part storage hole (ii) 3 Head end face of outer joint (4) Parallel key insertion hole of outer joint (ii) 6 Weld groove processed part of outer joint (ii) 7 Convex groove of outer joint (ii) 8 Outer surface Fitting groove

Claims (5)

  In the steel pipe pile joint structure in which an outer surface joint is provided at the upper end of the lower steel pipe pile initially installed and an inner surface joint is provided at the lower end of the upper steel pipe pile and the inner surface joint is inserted into the outer surface joint The inner joint has a bolt hole with a nut function in order to bolt the square groove and parallel key to insert and fix the parallel key to the flange structure and outer convex part to put on the gear-like uneven groove and outer surface joint And an external joint having a flat surface for supporting the inner joint on the head and a rectangular through hole through which the gear-like concavo-convex groove and the parallel key pass in the inner recess on the inner side and a long hole having the bolt hole in which the head of the bolt is accommodated The parallel joint of the body and a bolt for fixing the parallel key to the inner joint are provided, and the inner joint at the lower end of the upper steel pipe pile is inserted into the outer joint of the upper end of the lower steel pipe pile along the gear-like uneven groove, Joint collar is the head of the external joint It is put on. A steel pipe pile joint structure in which a rectangular parallel key is inserted into a through hole of an outer joint, the parallel key is fixed to the inner joint with a bolt, and upper and lower steel pipe piles are fixed.   The steel pipe pile joint structure according to claim 1, characterized in that it has a flange structure for transmitting the press fit load of the rotational press fit of the upper steel pipe pile to the lower steel pipe pile.   The steel pipe pile joint structure according to claim 1, characterized by having an uneven groove for transmitting the rotational load of the upper steel pipe pile to the lower steel pipe pile.   The steel pipe pile joint structure according to claim 1, further comprising a parallel key for fixing the inner and outer joints and preventing the joint from falling off when pulling out the steel pipe pile.   The steel pipe pile joint structure according to claim 1, wherein the parallel keyhole of the outer joint is a horizontally-long rectangle.