JPH11344169A - Pipe joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide enough durability against a shock in an axial direction and a load. SOLUTION: This pipe joint comprises a pair of joins fixed to a joint surface in the end portion of a pipe. One of the joints is a male joint 12 having a flange 16 integrated with an end surface of a pipe by welding; a tubular part 18 standing in the center of the flange 16, and recessed and protruding grooves 20 formed protrusively on the periphery of the tubular part and notched intermittently in the circumferential direction at a predetermined pitch to be divided into a plurality of blocks. The other one is a female joint 14 which is integrated with an end surface of a pipe by welding, and is fitted to the tubular part 18 of the male joint 12 to be allowed to about to the end surface of the flange 16 of the male joint 12 so as to form a cylindrical shape continuing as a unit. On the internal circumferential surface thereof, recessed and protruding grooves 22, which are notched intermittently in the circumferential direction at a predetermined pitch to be divided into a plurality of blocks, are protrusively provided to mesh with the recessed and protruding grooves 20. In fitting both of the joints 12 and 14, they are fitted to each other avoiding the protruding part of the recessed and protruding grooves 20 and 22, and the grooves 20 and 22 are meshed with each other to be connected by rotating one of the joints in the fitting state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure used for connecting a steel pipe pile, a concrete pile, a prism, or the like, and more particularly to a joint structure excellent in stress transmission in an axial direction.

[0002]

2. Description of the Related Art When laying steel pipe piles and concrete piles underground, a construction method shown in FIG. 8 is generally employed.
In the illustrated construction method, the lower pile 2 is driven into the ground E by lowering the hammer head 1a of the pile driver 1 along the guide 1b and applying a striking force to the pile head of the lower pile 2.
The second pile 4 is hung by the crawler crane 3 and its tip is connected to the pile head of the lower pile 2 exposed on the ground surface. Perform the placing work of 4.

[0003] By repeating the same operation one after another, piles are built up to a predetermined underground depth while joining a plurality of piles.

Conventionally, the connection structure of the connection portion 5 between the piles 2 and 4 is made of steel material which has been previously welded on site in the case of a steel pipe pile or in the case of a concrete pile, which has been previously integrated vertically. The end plates were also fixed by field welding, but in each case a field welding technician was required, and the welding work was affected by the weather etc.,
It was not necessarily a reliable bonding structure.

In order to solve such problems, various types of weldless joint structures have been developed. Among them, a typical joint structure of a concrete pile is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-259082.

The technique described in this publication is composed of a pair of half-split inner rings which are fitted to the outer periphery of an end plate of a concrete pile in an uneven shape, and an outer ring which is taperedly engaged with the inner rings. The inner ring is engaged with the outer periphery of the end plate in a state where the outer ring is joined up and down, and then the outer ring that has been passed through the outer periphery of one of the piles is fitted into the outer side of the inner ring and moved in the taper direction, This structure connects the upper and lower piles by contracting the inner ring to a tight fit.

In the case of steel pipe piles, for example,
As shown in JP-A-119132, a pair of half-shaped inner rings meshing with the irregularities are formed by forming irregularities on the upper and lower peripheries of the pile, or integrating the members having the irregularities.
And a joint structure similar to the above-described joint structure of a concrete pile provided with an outer ring in which the inner ring is fitted tightly, or as shown in JP-A-9-143987, In addition to the disclosed joint structure including a joint ring that engages in a shape and a bolt that tightly couples both ends of the joint ring in a crimped state, and those in which these shrink coupling structures are slightly improved Are variously disclosed.

[0008]

However, the above-mentioned various types of welded joint structures have the following problems. First, any joint structure is a basic structure in which the outer periphery of the joint between the piles is crimped and connected in a tightly fitted state by a ring, while the percussion movement of the hammer head 1a causes the hammer head 1a to receive one stroke from the hammer head 1a. Since the impact load is actually very large, if the ring is not firmly fitted, the ring may fall off due to its cumulative impact load and additionally the penetration resistance of the pile into the ground. Was. As described above, various small-improvement techniques have been developed to prevent the detachment, but none of them has a sufficient drop-prevention effect despite the complexity of the mechanism.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a pipe joint structure having sufficient durability against an impact or a load in an axial direction.

[0010]

In order to achieve the above object, the present invention comprises a pair of joints each fixed to a joint surface at a pipe end, and one of the joints is a male joint. The male joint has a flange integrated with the end face of the pipe by welding, a cylindrical portion rising at the center of the flange, and a protrusion formed on the outer periphery of the cylindrical portion, and intermittently cut at a predetermined pitch in a circumferential direction. A concave and convex groove which is divided into a plurality of blocks, and the other joint is a female joint, and the female joint is
The pipe is integrated with the end face of the pipe by welding, is fitted to the cylindrical portion of the male joint, abuts against the flange end face of the male joint to form an integrally continuous cylinder, and the concave and convex grooves are formed on the inner peripheral surface thereof. The male and female joints are intermittently cut out at the same pitch as the male joint, and are formed into a plurality of blocks. The concave and convex grooves are engaged with each other by engaging one of the joints while avoiding the protruding position of the groove and rotating one joint in the fitted state.

Therefore, in the above configuration, since the joints are connected by the fitting operation and the rotating operation, the connecting operation can be performed easily and in a short time. There is no complexity.

[0012] Further, by forming a mark indicating the fitting position on the outer periphery of the two joints, the fitting operation can be performed more reliably.

Further, by opening a bolt hole and a screw hole in the two joints in which the concave and convex grooves are engaged with each other in a state in which the concave and convex grooves are engaged with each other, if a bolt is screwed into the bolt hole after the connection operation, the rotational torque of the two joints is reduced. The bolts can be shared, and more reliable connection can be performed.

Further, since each of the concavo-convex grooves is formed in a substantially trapezoidal shape when viewed in the axial direction, the two joints can be fitted in a tapered shape at the time of fitting, thereby facilitating positioning.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

1 and 2, a male joint 12 and a female joint 14 according to the present invention are fixed to the head and the bottom of a lower and upper pile 10 made of a steel pipe, respectively.

Each of the joints 12 and 14 is made of a cylindrical die-cast product such as a casting.
0, a flange 16 having the same diameter as the pile 10 integrated with the head by welding, and a hollow cylindrical portion 1 protruding from the upper surface of the flange 16.
8 and a concave / convex groove 20 having a triangular cross section, which is formed in a trapezoidal shape on the outer periphery of the cylindrical portion 18 and is notched evenly at a predetermined pitch in the circumferential direction and divided into a plurality of blocks.

On the other hand, the female joint 14 is fixed to the bottom surface of the pile 10 by welding and is a cylinder having the same diameter as the pile 10. The inner diameter of the female joint 14 is equal to the outer diameter of the cylindrical portion 18. The dimensions are substantially the same as the added dimensions, and the height is substantially equivalent to the protruding height of the cylindrical portion 18. An inner peripheral portion of the female joint 14 has a triangular uneven groove 22 which meshes with each of the uneven grooves 20.
Are formed to protrude.

The concave / convex grooves 22 are provided on the male joint 12 side.
It is cut off intermittently in the circumferential direction at the same pitch as 0 and is blocked so that it can be fitted into the gap between the projecting positions of the concave and convex grooves 20, and the position avoiding the projecting positions of the concave and convex grooves 20 and 22. And the female joint 14 can be fitted to the male joint 12 at the position shown in FIG.

A circumferential positioning groove 24 is formed on the surface of the male joint flange 16, and a ring-shaped positioning protrusion 26 is projected from the end surface of the female joint 14 correspondingly. , 14 are fitted in a seated state.

Further, in the figure, reference numeral 28 denotes a fitting positioning stamp engraved on the outer periphery of both joints 12, 14.
Reference numeral 30 denotes a bolt hole formed in the outer periphery of the female joint 14 in the vicinity of the joint mark 28, and reference numeral 32 is formed in the outer periphery of the cylindrical portion of the male joint 12, and coincides with the bolt hole 30 in a state rotated from the engraving position. Screw holes. In addition, in the figure, the joint mark 28,
Although the bolt hole 30 and the screw hole 32 are provided at one position, it is needless to say that the bolt hole 30 and the screw hole 32 can be formed at a plurality of positions.

Next, the joining procedure of the piles 10 in the above configuration will be described with reference to FIGS.

First, as a joining preparation work, as shown in FIG. 3, a binding band 40 is fitted on the upper outer periphery of the lower pile 10. On the outer periphery of the binding band 40, three guide angles 42 projecting from the upper peripheral edge of the cylindrical portion 18 are formed.
The upper pile 10 which is vertically mounted at an interval of ° and is suspended by a crane (not shown) is guided by these guide angles 42.

Then, the female joint 14 is seated on the upper part of the flange 16 of the male joint 12 as shown in FIG. Fits on the outer circumference. In this state, FIG.
As shown in cross section in FIG.
0 and 22 are alternately positioned so as not to hinder the fitting operation.

In the drawing, adjacent concave and convex grooves 20,
Although they are drawn so as to be closely engaged with each other in the radial direction, it is needless to say that some gaps are provided in consideration of the hanging workability.

In this state, when the upper pile 10 is rotated clockwise as indicated by the arrow in each drawing, the bolt hole 30 coincides with the screw hole 32. At the same time, the concave and convex grooves 20,
As shown in FIGS. 4 and 5 (b), the bolts B can be screwed into each other, and the screw B is screwed in, thereby stopping the rotation in the circumferential direction. Then tie band 4
If 0 is removed, all joining operations are completed.

FIGS. 6A and 6B show the above operation viewed from the side. When the upper pile 10 is suspended, the positioning protrusions 26 of the female joint 12 are fitted in the positioning grooves 24 of the flange 16. Fitting and seating stability are performed, and at the same time, circumferential rotation guide is performed. After the rotation operation, as shown in (b) in particular, the irregularities are closely meshed with each other, and the torque in the axial force direction is shared by this portion, thereby realizing a strong connection in a short time. Will be.

After the joining operation, the piles are sequentially buried in the ground by the operation shown in FIG. 8. With the above structure, sufficient durability against repeated impact loads on the pile 10 after the joining operation can be obtained. In addition, since there are no extra protrusions on the outer periphery, there are advantages that the penetration resistance can be reduced.

In the above embodiment, the case where the male joint 12 is fixed to the pile head and the female joint 14 is fixed to the pile bottom is described. Further, the guide angle 42 for the call-in guide can also be mounted on the upper side pile, and any one can be selected in consideration of the mounting workability.

FIG. 7 shows another embodiment of the present invention. In the drawings, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described using different reference numerals.

The figure shows the male joint 12, and each concave / convex groove 50 protruding from the outer periphery of the cylindrical portion 18 is formed into a block at a predetermined pitch in a state where the diameter thereof is reduced in a trapezoidal shape toward the upper side in a side view. Accordingly, the outer peripheral surface of the cylindrical portion 18 has a wedge shape.

On the other hand, although not shown, the female joint is a trapezoidal concave / convex groove opposite to the above trapezoidal concave / convex groove 50, and is blocked at the same pitch as the male joint 12.

Therefore, in the present embodiment, the fitting operation is sequentially guided in a wedge shape at the time of fitting, so that the fitting operation is further improved.

In each of the above embodiments, the cross-sectional shape of the concave / convex groove is triangular. However, various conceivable cross-sectional shapes such as rectangular concave / convex, corrugated concave / convex, and sawtooth concave / convex can be adopted. However, an optimum cross-sectional shape can be selected for the above uneven shape in consideration of the manufacturing cost, the reliability of coupling between the joints 12 and 14, the mechanical structure, and the workability.

In the embodiment, the present invention is applied to the joining of piles. However, the present invention is applicable to joining of structural materials for construction such as joining of steel pipe columns. Although the pile was used as the joining target, if the flange shape of the joint is appropriately formed according to the end face shape of the pipe, it is applicable to joining of pipes having any cross-sectional shape such as not only a cylindrical shape but also a square or a polygon, and Since there is no protrusion on the outer periphery of the joining position, joining can be sequentially performed in a short time while maintaining the same tube diameter.

[0036]

According to the present invention, the following effects can be obtained. In the axial direction of the pipe, a strong connection is maintained by the concave and convex fitting, and there is an advantage that a high transmission efficiency with respect to the axial stress can be obtained in combination with the high joining rigidity.

The number of bolts for connection can be extremely reduced as compared with the conventional one, so that the workability is remarkably improved and the work time can be shortened. When applied to a pile, penetration resistance can be reduced by setting the same diameter as its outer diameter.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a joint according to an embodiment of the present invention.

2 (a) and 2 (b) are partial cross-sectional perspective views showing portions A and B of FIG. 1 in an enlarged manner.

FIG. 3 is a perspective view showing a procedure for assembling a pile using the joint.

4 (a) and 4 (b) are perspective views showing a work procedure following FIG. 3;

5 (a) and 5 (b) are CCs of FIGS. 4 (a) and 4 (b).
It is a plane sectional view in a line and a DD line.

6 (a) and 6 (b) are cross-sectional views of the working form viewed from the side.

FIG. 7 is a perspective view showing another embodiment of the present invention.

FIG. 8 is an explanatory diagram of a construction method showing a general pile driving procedure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steel pipe pile 12 Male joint 14 Female joint 16 Flange 18 Cylindrical part 20, 50, 22 Irregular groove 28 Joint mark 30 Bolt hole 32 Screw hole B Bolt

Claims (4)

[Claims] 1. A joint comprising a pair of joints fixed to a joint surface of a pipe end, wherein one of the joints is a male joint, and the male joint is integrated with an end face of the pipe by welding. Flange, a cylindrical portion that rises at the center of the flange, and an uneven groove that is formed to protrude from the outer periphery of the cylindrical portion and that is cut off intermittently at a predetermined pitch in the circumferential direction and divided into a plurality of blocks. The other joint is a female joint, and the female joint is integrated with the end face of the pipe by welding, is fitted to the cylindrical portion of the male joint, and comes into contact with the flange end face of the male joint so as to be integrally continuous. And an inner peripheral surface thereof is formed with an uneven groove that meshes with each of the concave and convex grooves and is cut off intermittently at the same pitch as the male joint in the circumferential direction and divided into a plurality of blocks. When the two joints are fitted with each other, A joint structure for pipes, characterized in that the concave and convex grooves are engaged with each other and connected by rotating one joint in the fitted state. 2. A joint structure for a pipe according to claim 1, wherein a joint mark indicating a fitting position is formed on an outer periphery of said joints. 3. The joint structure for a pipe according to claim 1, wherein the two joints are provided with matching bolt holes and screw holes in a state where the concave and convex grooves are engaged with each other. 4. The pipe joint structure according to claim 1, wherein each of the concave and convex grooves is formed so as to project substantially in a trapezoidal shape when viewed in the axial direction.