JP4347149B2 - Mechanical joint of a longitudinal connection device for piles with means for preventing looseness - Google Patents

Description

  The present invention relates to a mechanical joint of a longitudinal connection device for piles used in civil engineering and building structures.

  In the construction of columnar bodies such as steel pipe piles and columns, for the purpose of production and transportation, the columnar body of a fixed-size object is brought into the site, and a thing of a predetermined length is formed while being cascaded on site. Yes. Conventionally, this longitudinal joint is constructed such that an upper columnar body (upper steel pipe) is suspended from a lower columnar body (lower steel pipe) by a crane and joined together by welding.

Since this longitudinal welding by welding is on-site welding, it takes a lot of time to work and requires a skilled welder, and the quality of the weld is not only influenced by the weather, but also the back of the welding. It was cumbersome and costly to use fittings such as a contact ring. Therefore, as an alternative to the longitudinal joining by welding, a method of connecting the upper steel pipe and the lower steel pipe with a threaded joint has been proposed (Cited document 1).
In view of such circumstances, it is possible to perform the work firmly and easily by using mechanical means instead of the longitudinal joining method by welding steel pipe piles, without using special machines or requiring special skills. For example, a male pin joint material protrudes from the end of the steel pipe body, and the other steel pipe body that is longitudinally connected to the steel pipe sheet pile is fitted with the pin joint material. A female box joint material to be joined, and the box joint and the pin joint are fitted and integrated, and at that time, the joint surface between the outer periphery of the pin joint material and the inner periphery of the box joint material A circular key is inserted into the inner groove of the pin joint from the inner groove side of the box joint material by a bolt that is screwed by operation from the outside of the box joint. Steel pipe sheet pile that integrates both Is known (Patent Document 2).

JP-A-4-70414 Japanese Patent No. 3336430

However, the longitudinal joining method (apparatus) using the screw joint described in Patent Document 1 is cumbersome and expensive to manufacture, and the connecting work is also troublesome. Moreover, in the longitudinal connection of steel pipe piles, the upper pile is suspended and joined together on the lower pile, so that it is extremely difficult to rotate for screwing while hanging the upper pile.
Furthermore, in the construction method in which steel pipe piles are laid by rotary press-fitting, they may be rotated in the reverse direction during construction. In such cases, the screws of the threaded joints will loosen, so the longitudinal joining method by screwing should be adopted. I can't.

The mechanical means (mechanical joint) described in Patent Document 2 uses a structure in which an arc key (load transmission key) is pushed and fixed by a set bolt, but no load acts on the set bolt. However, in general, it is loosened by vibration.
For this reason, there is a possibility that the set bolt is loosened due to vibration at the time of construction and the predetermined performance cannot be exhibited. In particular, when the striking method is adopted, there is a problem that the bolt is likely to loosen.

  Therefore, the object of the present invention is that the bolt of the screwing means for connecting the pin joint material of the pile to be cascaded with the box joint material is loosened due to vibration and blow during construction, and the bending strength of the joint portion is reduced. Is to prevent.

According to the first aspect of the present invention, a pin joint material having a cylindrical shape and an outer groove formed on the outer periphery is inserted into an end portion of one pile vertically connected to each other, and a pin joint material is inserted into an end portion of the other pile. A box joint material is provided which is cylindrical and has inner groove strips corresponding to the outer peripheral grooves. The pin joint material and the box joint material are fitted together, and both joint members are connected by a plurality of screwing means to join the piles together. A mechanical joint of a longitudinally connecting device for piles, an arc key housed in the inner groove, a bolt for setting screwing means for moving the arc key forward and backward in the inner and outer grooves, and an outer periphery of the box joint material A set bolt insertion screw hole provided in the screw hole, and a loosening prevention means for preventing the set bolt from loosening in the screw hole, wherein the loosening prevention means is provided on the screw hole or the bolt. And in the screw hole, A configuration in which screwed locking bolt to prevent the upward movement of the belt head, the set bolt abuts the outer groove bottom wall at a position across the inner groove and the outer groove arcs key from the groove The pile longitudinally connected machine characterized in that the machine is moved to the position and the loosening prevention means prevents the arc key from moving to the inner groove side by rotating the set bolt in the screw hole in the loosening direction. It is a joint .
請 Motomeko 2 of invention, prior Kiyurumi prevention means, the screw holes or the locking bolt in the pile of claim 1, wherein it is formed by applying the anti-loosening agent longitudinal splicer machine It is a joint .
The invention according to claim 3, before Kiyurumi preventing means is a jointed device mechanical joint pile according to claim 1 or 2, wherein said a configuration of the locking nut screwed on locking bolts There is .
The invention according to claim 4, before Kiyurumi preventing means according to claim 1, characterized in that the set bolt head or locking bolt is configured to engaged with the stop ring It is a mechanical joint of a pile cascade device .

According to the inventions according to claims 1 to 4 , the bolts (screws for setting) of the screw fastening means for connecting the box joint material and the pin joint material rotate in the direction of loosening in the screw holes and move in the axial direction. Since the loosening prevention means for preventing is provided, even if the vibration / striking method is applied to the vertically connected piles, the bolts are not loosened, and the vertically connected piles can exhibit a predetermined performance.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a half cut side view of a first embodiment of a mechanical joint device of a longitudinal connection device for piles, and FIG. 2 is a diagram in which the ends of an upper steel pipe and a lower steel pipe are separated from each other in the first embodiment. FIG. 3 is a half cutaway side view of FIG.

(Mechanical joint of steel pipe cascade)
A mechanical joint of the steel pipe longitudinal joint device will be described. 1-3, 1 is an upper steel pipe, 2 is a lower steel pipe. On the upper steel pipe 1, a female box joint material 3 is welded and protruded at an end portion to be joined with the lower steel pipe 2, and the lower steel pipe 2 is joined to the upper steel pipe 1. A male pin joint material 4 that is received in the box joint material 3 is protruded from the box by welding.
As shown in FIG. 4, which is an exploded perspective view of the mechanical joint of the steel pipe longitudinal coupling device, the box joint material 3 and the pin joint material 4 are mechanically connected by the arc key 12 or the like.

  The pin joint material 4 is formed in a cylindrical shape, and a fitting insertion portion 7 having a diameter smaller than that of the base tube portion 6 is extended from the base tube portion 6 having substantially the same diameter as the outer diameter of the steel pipe body. . And the joining end surface 9a which contact | connects the front-end | tip of the box joint material 3 is formed in the base end outer side of the fitting insertion part 7, The engagement recessed part 9b is provided in the joining end surface 9a around, and the fitting insertion part An engaging projection 9 c is provided around the tip of 7. Further, an outer groove 7 a that engages with the arc key 12 is provided on the outer peripheral joint surface 7 b of the fitting insertion portion 7.

The box joint material 3 has a cylindrical shape whose outer diameter is the same as the outer diameter of the steel pipe main body, and the inner periphery thereof receives the fitting insertion portion 7 of the pin joint material 4. corresponding joined surfaces 8b fit receiving portion 8 formed with the formation of the shape, and the end face 9e that contacts the joining end face 9 a of the insertion portion 7 mating with the cylindrical base portion 6 of the pin joint member 4 on the tip the engaging recess 9b And a recess 9d that engages with the engagement protrusion 9c at the distal end of the fitting insertion portion 7 is provided around the base end of the fitting receiving portion 7. An inner groove 8a formed deeper than the outer groove 7a is provided on the inner peripheral joint surface 8b of the fitting receiving portion 8 so as to correspond to the outer groove 7a.
In the illustrated example, each of the plurality of outer and inner groove strips 7a and 8a is spaced apart in the tube axis direction of the steel pipe. However, the necessary number of the outer and inner groove strips 7a and 8a may be appropriately provided. it can.

  In addition, a plurality of screw holes 10 provided at intervals in the circumferential direction from the outer periphery of the box joint material 3 are communicated with each inner groove 8a. By operating the set bolt 11 screwed into the hole 10, an arc key 12 that is screwed from the inner groove 8a to a position straddling the inner groove 8a and the outer groove 7a of the insertion portion 7 is accommodated. Has been. For example, as shown in FIGS. 5 and 6 to be described later, the setting bolt 11 has a right-handed head portion 11a that is screwed into the screw hole 10 at the base end portion, as shown in FIGS. It has a tail portion 11b that engages with a left screw (reverse screw) provided on the arc key 12, and the arc key 12 moves forward by rotating the bolt 11 forward (right) and screwing in, and reverse (left) When it is rotated, the arc key 12 moves backward.

In order to longitudinally connect the upper steel pipe 1 and the lower steel pipe 2, the upper steel pipe 1 is lifted by a crane, carried directly above the lower steel pipe 2 and suspended, and the box joint material 3 of the upper steel pipe 1 is attached to the lower steel pipe 2. If inserted into the pin joint material 4, the engaging recess 9 d and the engaging protrusion 9 c of the fitting insertion portion 7 of both joint materials 3, 4 are respectively connected to the protrusion 9 f and the recess 9 b of the fitting receiving portion 8. The upper steel pipe 1 and the lower steel pipe 2 are engaged with each other.

Thereafter, by adjusting the rotation of the upper steel pipe 1, the positions of the joint members of both the steel pipes 1 and 2 are made to coincide with each other and the bolts 11 are screwed so that the arc key 12 accommodated in the inner groove 8 a Push in toward 7a. As a result, the arc key 12 is engaged across both the grooves 7a and 8a, and both the steel pipes 1 and 2 are connected through the arc key 12 so as not to be inserted and removed.
Further, by the engagement of the engagement recess 9 b and the projection 9f and the engagement projection 9c and the recess 9d, Hakare binding strengthening by connecting the two joint members 3, 4, that the particular bending resistance is increased Become.

  In this connection via the arc key 12, the tensile force is transmitted from one joint 3 or 4 to the arc key 12 by the bearing stress of the outer grooves 7a, 8a and the side surface of the arc key 12, and is expressed as shear stress. It is transmitted to the opposite side of the arc key 12. Then, it is transmitted to the other joint 4 or 3 again by the bearing stress of the outer and inner grooves 7a and 8a and the side surface of the arc key 12. The compressive force is transmitted by compressive stress on a plane perpendicular to the tube axis of both joints 3 and 4.

In the embodiment of the apparatus, the box joint material 3 is provided on the upper steel pipe and the pin joint material 4 is provided on the lower steel pipe. It can be set as the structure which provided the pin joint material 4 in the direction, and provided the box joint material 3 in the direction of the lower steel pipe.
Further, the structure in which the arc key is screwed is not limited to this, and the arc key may be an engaging key to be engaged, and may be a load transmitting key for transmitting a load.

(Loosening prevention means)
Next, a means for preventing loosening of bolts (set bolts) for screwing means for connecting the pin joint material and the box joint material will be described.
FIG. 5 is an enlarged cross-sectional view of the main part of the first embodiment of the bolt loosening prevention means of the screw fastening means.
The bolt loosening prevention means according to the first embodiment of the loosening prevention means will be described with reference to FIG. As shown in the figure, the set bolt 11 is screwed into the screw hole 10, the head 11a of the set bolt is rotated, and the arc key is moved from the inner groove 8a into the outer groove 7a of the fitting insertion portion 7. Screw to a position straddling the inner groove 8a. Next, in this state, a set bolt 13a having a hexagonal hole in the shaft portion is screwed into the screw hole 10. At that time, the set bolt is reliably prevented from loosening by applying a loosening preventive agent to the screw hole 10 portion or the set bolt 13a into which the set bolt 13a is screwed.
Further, in relation to this configuration, without using a set bolt, a loosening prevention material is applied to the screw hole 10 or the set bolt 11 to prevent the set bolt 11 from being loosened. It can also be a means.

FIG. 6 shows a second embodiment of the loosening prevention means 13. In this embodiment, a set bolt 13a having a hexagonal hole in the shaft is screwed into the screw hole 10, a toothed washer 13d is inserted into the set bolt 13a, and tightened with a nut 13c to loosen the set bolt 11. To prevent.
Instead of the combination of the toothed washer and the nut, a hexagon nut with an external toothed washer may be used.

FIG. 7 shows a third embodiment in which the loosening prevention means is prevented by using a stop ring. In this embodiment, a stop ring 20 shown in FIG. 8 is arranged on the head of the set bolt 11 to prevent the set bolt 11 from moving upward and prevent loosening.
FIG. 8 is a plan view showing an example of a stop ring used in the loosening prevention means of FIG. The stop ring 20 is formed as a substantially arc-shaped member having one end open and having elasticity.
This loosening prevention means is a predetermined position on the inner wall of the screw hole 10, that is, a bolt (set bolt) 11 is screwed into the screw hole 10, and the arc key is inserted from the inner groove 8 a into the outer groove of the insertion portion 7. An annular groove for inserting a stop ring is provided corresponding to the position of the head 11a of the set bolt in a state where it is screwed to a position straddling the inside of the strip 7a and the inner groove strip 8a, and the stop ring is provided in the annular groove. It is a structure which inserts 20 using the elastic force. The stop ring 20 inserted into the annular groove can protrude into the screw hole 10 and prevent the bolt 11 from moving upward as shown in FIG.
Further, the loosening prevention means using the stop ring 20 is such that the set bolt 11 is set in the screw hole 10 and the head thereof is pressed by the hexagon socket set bolt 13a, and the stop ring 20 is used for the set bolt. It can also be set as the structure which prevents the upward movement of the head of 13a.

Next, a second embodiment of the mechanical joint will be described.
FIG. 9 is an exploded perspective view of the second embodiment of the mechanical joint, FIG. 10A is a longitudinal sectional view of a main part in a state where the joint material of the mechanical joint is coupled, and FIG. 10B is a circle T in FIG. 10A. It is the figure which expanded and showed the part.
9 and 10A, 101 is a lower pile placed in advance, 102 is an upper pile joined thereto, and 103 is a joint metal tube (box joint material) fixed to the upper end of the lower pile 101. , 104 is a joint metal tube (pin joint material) fixed to the lower end of the upper pile 102.
A plurality of, for example, four L-shaped claw grooves 105 are vertically formed at equal intervals on the upper end circumference of the joint metal tube 103, and the claw grooves 105 are formed on the lower end circumference of the joint metal tube 104. A corresponding L-shaped claw 106 is vertically formed. The width dimension B of the claw groove 105 is set to be slightly larger than the width dimension B ′ of the claw 106. When the B ′ portion of each claw 106 is aligned with the B portion of each claw groove 105 and inserted in the direction of arrow A , and the rotation 1C portion is fitted to the 1C ′ portion in the direction of arrow B , the joint fitting cylinders 103 and 104 are Combined, the upper pile 102 is connected to the lower pile 101. The 1C portion and the 1C ′ portion coincide with each other when the lower end surface 107 of the joint fitting cylinder 104 is in contact with the upper end face 108 of the joint fitting cylinder 103. Further, a guide tube 109 is provided on the inner peripheral surface of the joint fitting tube 104 so as to be fitted to the inner peripheral surface of the joint fitting tube 103 in the pile axial direction with respect to the claw 106. By fitting them into 103, the respective claws 106 are easily inserted into the respective claw grooves 105.

After the connection of the upper pile 102 is completed, the bolt 111 is inserted to a predetermined depth of the bolt hole 110 to fix the joint fitting tube 103 and the guide tube 109. Here, as a means for preventing the bolt 111 from loosening, the bolt 111 is used to prevent the bolt 111 from loosening. That is, as shown in FIG. 10B, after the bolt 111 is inserted to a predetermined depth of the bolt hole 110, a set bolt 112a having a hexagonal hole is screwed into the bolt hole 110, and a toothed washer 113 is fitted to the set bolt 112a. put, thereby preventing loosening of the bolts 111 are tightened by nuts.
Note that the loosening prevention means according to the first and third embodiments can be similarly applied to this mechanical joint. The bolt loosening prevention means of the mechanical joint according to the present invention can also be applied to conventional mechanical joints, for example, mechanical joints described in Japanese Patent Laid-Open Nos. 11-36285 and 2000-31874.

It is a half part cutting side view showing one embodiment of the present invention. It is the half part cutting | disconnection side view which separated and showed the edge part of the same pile and the lower pile. It is a plane sectional view of the same half. It is a disassembled perspective view for demonstrating a mechanical coupling. It is a principal part expanded side surface sectional view for demonstrating Embodiment 1 of a loosening prevention means. It is a principal part expanded side surface sectional view for demonstrating Embodiment 2 of a loosening prevention means. It is a principal part expanded side surface sectional view for demonstrating Embodiment 3 of a loosening prevention means. It is a top view which shows an example of the stop ring used with the loosening prevention means of FIG. It is a disassembled perspective view of the mechanical coupling which concerns on 2nd Embodiment. 10A is a longitudinal sectional view of a main part in a state in which the joint material of the mechanical joint of FIG. 9 is coupled, and FIG. 10B is an enlarged view of a portion in a circle T of FIG. 10A.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Upper steel pipe, 2 ... Lower steel pipe, 3 ... Box joint material, 4 ... Pin joint material, 5 ... Welded part, 6 ... Base cylinder part, 7 ... Insertion part, 8 ... Fitting receiving part, 9a ... Junction end face, 9b ... engagement recessed part, 9c ... engagement protrusion, 10 ... screw hole, 11 ... bolt, 12 ... Arc key, 13 ... Loosening stop means, 13a ... Set bolt, 13b ... Set bolt with locking agent, 13c ... Nut, 13d ... Toothed washer, 20 ... Stop ring , 101 ... Lower pile, 102 ... Upper pile, 104, 105 ... Joint tube, 110 ... Bolt hole, 111 ... Bolt, 112 ... Set bolt, 113 ... Teeth With washer.

Claims (4)

A pin joint material with an outer groove formed on the outer periphery at the end of one pile that is longitudinally connected to each other is formed into a cylindrical shape that inserts a pin joint material at the end of the other pile into the outer peripheral groove. A pile joint device for piles in which a box joint material having a corresponding inner groove is provided, the pin joint material and the box joint material are fitted together, and both joint materials are connected by a plurality of screwing means to join the piles together. Mechanical joints,
An arc key accommodated in the inner groove;
A bolt for setting screw fixing means for moving the arc key forward and backward in the inner and outer grooves;
A screw hole for inserting a bolt for setting provided on the outer periphery of the box joint material;
A loosening prevention means for preventing loosening of the set bolt in the screw hole;
Have
The loosening prevention means is configured by applying a loosening prevention agent to the screw hole or the bolt and screwing a loosening prevention bolt into the screw hole to further prevent the bolt head from moving upward,
The set bolt moves the arc key from the inner groove to a position straddling the inner groove and the outer groove and abuts against the bottom wall of the outer groove, and the loosening preventing means loosens the set bolt in the screw hole. Rotating in the direction to prevent the arc key from moving to the inner groove side, a mechanical joint for a longitudinally connecting pile device. 2. A mechanical joint for a longitudinal joint device for piles according to claim 1, wherein the loosening prevention means is configured to apply a loosening prevention agent to the screw hole or the loosening prevention bolt. Said loosening prevention means, according to claim 1 or 2 vertical splicer machine joint pile, wherein the locknut loosening the locking bolt is a configuration in which screwing. Said anti-loosening means, jointed apparatus mechanical joint pile according to any one of claims 1 to 3, characterized in that the set bolt head or locking bolt is a configuration in which the locking at stop ring .

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