JPH11140867A - Joint structure of prefabricated cylindrical pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a joint structure by mutually butting both pile flanges fixed to ends of two prefabricated cylindrical pile members, and connecting parts having a circular arc shape in section which holds both pile flanges in the axial direction of the prefabricated pile members, to each other, thereby connecting both the pile flanges. SOLUTION: A part 3 having a circular arc shape in plane, which has a groove shape in section so as to hold both pile flanges 2, 2 in the axial direction, is inserted into the flanges 2, 2 mutually butted, from the outer circumferential side thereof. With an inclination in each of a surface of the flange 2 on the side of a prefabricated pile member 1 and surface of the part 3 brought into contact therewith, the parts 3, 3 are brought into contact with the outer surfaces of both the flanges 2, 2, by means of a bolt 4 and a nut 5 fastened for connecting the parts 3, 3. When pressure is applied to both the flanges 2, 2 to the radial center side of the prefabricated member 1, the franges 2, 2 are applied with compression force to the board thickness direction thereof by the parts 3, 3 to thereby connect the flanges 2, 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure in which cylindrical precast pile members, which are precast concrete piles, steel pipe piles, or steel pipe sheet piles formed by centrifugal force are connected to each other.

[0002]

2. Description of the Related Art A method for connecting cylindrical prefabricated pile members to each other is shown in FIG.
As shown in FIG. 14, welded joints are common, but recently, threaded joints and wedge-type non-welded joints are also used.

On the other hand, cylindrical precast piles tend to have a larger diameter as the construction machine becomes larger, but in the case of welded joints, the time required for welding is increased as the pile diameter is increased, and the construction efficiency is reduced. In addition, as the pile length increases, the ratio of welding work to the pile construction time increases, which leads to a decrease in efficiency and an increase in cost.

[0004] The screw type non-welded joint is performed by aligning the axis of the upper pile with the axis of the lower pile, and rotating the upper pile. Due to reduced efficiency, it is only applied to relatively small diameter piles.

[0005] The present invention proposes a joint structure capable of securely connecting a large-diameter pile without lowering the efficiency.

[0006]

According to the present invention, a pile flange fixed to an end of two cylindrical preformed pile members is abutted against each other, and both pile flanges are sandwiched in the axial direction of the preformed pile member. Using multiple arc-shaped clamps,
Adjacent clamps are bolted as described in claim 1,
Alternatively, the joint work is simplified by welding and joining the two pile flanges as described in claim 2, thereby improving construction efficiency.

When adjacent clamps are bolted together, the ends of the clamps are butted against each other to form a flange through which the bolts pass.

[0008] The clamp has a cross-sectional shape that sandwiches both pile flanges in the axial direction of the ready-made pile member, so that the two pile flanges are joined to each other in the axial direction of the ready-made pile member by joining with adjacent bolts or by welding. A plurality of clamps are circumscribed to both pile flanges in an attempt to reduce the radius of curvature by bolt connection between adjacent clamps or shrinkage of the weld metal after welding, and the two pile flanges are connected to the radial direction of the ready-made pile member. It has a function to increase the rigidity of the joint part of both pile flanges because they are joined under pressure applied to the center side.

For this reason, since the plurality of clamps restrain the two pile flanges from the outer periphery to the inner periphery by joining adjacent clamps, even if there is an error in the butting condition of the pile flanges, the error is corrected. Work.

The joining of the two pile flanges is completed by abutting the pile flanges with each other, arranging the clamps on the outer periphery of the two pile flanges, and bolting or welding the adjacent clamps. Less time is required than when welding the entire circumference of the pile member. In addition, since the clamp corrects an error in the butt state of the pile flange, the butt joint does not require a high butt accuracy as in the case of the threaded joint, thereby simplifying the joint operation.

According to a third aspect of the present invention, the surface of the pile flange on the side of the prefabricated pile member to which the pile flange is fixed and the surface of the crane contacting the surface are formed from the inner periphery to the outer periphery of the prefabricated pile member. When inclined from the member side to the pile flange side, the plurality of clamps apply pressure to the pile flange in the radial center side of the ready-made pile member by joining the adjacent clamps as described above, and the wedge effect As a result, a force perpendicular to the surface of the crane from contact with the pile flange is applied as a compressive force in the thickness direction of the pile flanges to be joined to each other, so that the joints between the pile flanges become more reliable.

In the case where torque is transmitted between the pile flanges to be joined, projections are formed on opposite surfaces of both pile flanges so as to engage with each other in the circumferential direction.

In the case where the shear force is transmitted between the ready-made pile members, an inner cylinder inserted into the inside of one of the ready-made pile members and the inside of the other ready-made pile member may be provided. Fixed.

According to a sixth aspect of the present invention, in the case where the torque is transmitted while transmitting the shear force between the ready-made pile members, a convex portion is formed on the inner periphery of the ready-made pile member on the side where the inner cylinder is inserted. Is formed, and a concave portion is formed in the inner cylinder at a position corresponding to the convex portion so that the convex portion can be engaged in the circumferential direction of the ready-made pile member.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a pile flange 2, 2 fixed to an end of two cylindrical precast pile members 1, 1 is abutted against each other as shown in FIG. This is a joint structure in which a plurality of clamps 3 to be sandwiched are used, and the adjacent flanges 3, 3 are joined to each other with bolts 4 or welded to each other to join the pile flanges 2, 2.

The pile flange 2 is fixed by welding when the prefabricated pile member 1 is a steel pipe pile or a steel pipe sheet pile, and is fixed in concrete when a prefabricated concrete pile is used, or as shown in FIG. The pile member 1 is fixed by being welded to a fitting fixed to the end of the pile member 1. When the ready-made pile member 1 is a steel pipe pile or a steel sheet pile, the inside diameter of the pile flange 2 is set to be equal to or less than the inside diameter of the ready-made pile member 1, and the pile flange 2 is located between the pile flange 2 and the inner peripheral surface of the ready-made pile member 1. It is welded to the outer peripheral surface. The welding of the pile flange 2 is performed at a factory in terms of reliability and reliability.

The pile flange 2 shown in FIG. 3 shows a case where a cylindrical flange member 20 is formed by cold working or hot working after roll forming into a plate shape as shown in FIG. . The pile flange 2 (flange member 20) is formed by casting or centrifugal force casting.

The surface of the pile flange 2 on the side of the opposing pile flange 2 may be a flat surface as shown in FIG. 6 if the ready-made pile member 1 only needs to transmit only the axial force. In the case of pushing, as shown in FIGS. 7 to 9, protrusions 21 which are engaged with each other in the circumferential direction are formed so that torque can be transmitted between the pile flanges 2.

FIG. 8 shows that the shear force can be transmitted between the pile members 1 and 1 while transmitting the torque between the pile flanges 2 and 2 so that the shear force can be transmitted between the pile members 1 and 1. The case where the inner cylinder 11 which is inserted into the ready-made pile member 1 and can be inscribed in the ready-made pile member 1 is fixed. The inner cylinder 11 is fixed by welding to a position inscribed in the pile flange 2 as shown in FIG. FIG. 9 shows a state in which the ready-made pile members 1, 1 shown in FIG. 7 or FIG.

FIG. 10 shows a state in which a convex portion 12 is formed on the inner periphery of the ready-made pile member 1 on the side where the inner tube 11 is inserted, and the convex portion 12 of the inner tube 11 is formed.
An example in which a convex portion 12 is formed at a position corresponding to 12 to form a concave portion 13 that can be engaged in the circumferential direction of the ready-made pile member 1, and the inner cylinder 11 transmits shear force and torque between the ready-made pile members 1 and 1. Is shown.

In FIG. 10, the protrusion 12 is located at a position corresponding to the protrusion 12.
Is formed into a recess 13 having a shape that fits therein. However, similarly to the case where the protrusion 21 is formed on the pile flange 2, there is a clearance in the circumferential direction of the inner cylinder 11 between the protrusion 12 and the recess 13. Therefore, the circumferential length of the concave portion 13 may be larger than the circumferential length of the convex portion 12 in some cases.

The clamp 3 has an arc-shaped plane shape as shown in FIGS. 1 to 4 and has a groove-shaped cross section so as to sandwich the pile flanges 2 and 2 in the axial direction. , 2 from the outer peripheral side. FIG. 1 shows a case where two clamps 3 are used, and FIG. 2 shows a case where four clamps 3 are used.

When the adjacent clamps 3 and 3 are joined by bolts 4, flanges 31 are formed at the ends of the clamps 3 where the bolts 4 are used. The flanges 31 are formed above and below the clamp 3, and each flange 31 has one
Alternatively, a plurality of bolt holes 32 are formed. Bolt 4
In the case of using the crimps 3, 3 as shown in FIG.
In some cases, bolts 4 may be used for some of the butted portions, and the remaining butted portions may be rotatably connected by hinges.

FIG. 3 shows that the surface of the pile flange 2 on the side of the ready-made pile member 1 and the surface of the clamp 3 that comes into contact with the pile flange 2 are inclined so that the bolt 4 and the nut 5 are joined together. , 3 circumscribe the pile flanges 2 and 2 and apply pressure to the pile flanges 2 and 2 toward the radial center of the prefabricated pile member 1 and compress the pile flanges 2 and 2 in the thickness direction by the clamps 3. An example of a case where the pile flanges 2 and 2 are joined by applying force will be described.

In this case, the surface of the pile flange 2 on the side of the ready-made pile member 1 to which the pile flange 2 is fixed and the surface of the cramp 3 in contact therewith extend from the inner periphery to the outer periphery of the ready-made pile member 2. To the pile flange 2 side.

FIG. 4 shows a case where the flange members 20, 20 are welded to the fittings fixed to the ends of the ready-made pile members 1, 1 when the ready-made pile member 1 is a ready-made concrete pile as described above. .

FIG. 5 uses four clamps 3, and the adjacent clamps 3,
3 shows a case where the members 3 are joined by welding. Also in the case of welding, the clamps 3 apply pressure to the pile flanges 2 and 2 toward the radial center of the ready-made pile member 1 due to shrinkage of the weld metal 6 after welding,
At the same time, in order to apply a compressive force to the pile flanges 2 and 2 in the thickness direction thereof, the surface of the pile flange 2 on the side of the ready-made pile member 1 and the surface of the clamp 3 in contact therewith may be inclined as in FIG. .

FIG. 12 shows a state in which the ready-made pile members 1 and 1 in which the joint is completed are dropped into the borehole. FIG. 13 shows a state where a rotational force is applied to a rod 8 having a cutting wing 7 inserted into the ready-made pile member 1. The state where the ready-made pile member 1 is installed while excavating the ground or building soil cement is shown.

[0029]

According to the first and second aspects of the present invention, the pile flanges fixed to the ends of the two cylindrical ready-made pile members abut each other, and the two pile flanges are sandwiched in the axial direction of the ready-made pile members. A plurality of arcuate clamps having a cross-sectional shape are joined to each other to join both pile flanges, so that it takes less time and effort than when welding the entire circumference of a ready-made pile member, and construction efficiency is improved. Since the joint structure is simplified, the cost required for the joint is reduced.

Further, the plurality of clamps are formed by applying pressure to both pile flanges to the center in the radial direction of the ready-made pile member by bolt connection of adjacent clamps or contraction of the weld metal after welding. Since the pile flanges are joined, the rigidity of the joint between the two pile flanges is increased.

In addition, a plurality of clamps constrain both pile flanges from the outer periphery to the inner periphery with the joining of adjacent clamps, thereby correcting an error even if there is an error in the butting condition of the pile flanges. It does not require as high a butt accuracy as with a threaded joint and simplifies joint work.

In particular, in the first aspect, since the clamps are joined by bolts, the operation is not affected by the weather, and the operation time is shorter than that by welding.

Further, since the clamp is an arc-shaped part surrounding the pile flange, it is easy to handle. Therefore, it is easy to align the bolt holes of the adjacent clamps. If the torque given to the bolt is managed by a torque wrench, The joint management of the pile flange becomes easy.

In the third aspect, the contact surfaces of both the pile flange and the clamp are inclined from the inner periphery to the outer periphery of the ready-made pile member from the ready-made pile member side to the pile flange side. Since pressure is applied to the flanges to the center of the ready-made pile member in the center in the radial direction, a compressive force in the thickness direction is applied to the pile flanges to be joined to each other, so that the joints between the pile flanges become more reliable.

According to the fourth aspect of the present invention, since the projections which are engaged with each other in the circumferential direction are formed on the opposing surfaces of both pile flanges, torque can be transmitted between the pile flanges.

According to the fifth aspect, since the inner cylinder inserted into the other ready-made pile member is fixed to the inner periphery of one of the ready-made pile members, the shear force can be transmitted between the ready-made pile members.

In the sixth aspect, a convex portion is formed on the inner periphery of the ready-made pile member on the side where the inner cylinder is inserted, and a concave portion is formed on the inner cylinder so that the convex portion can be engaged with the circumferential direction of the ready-made pile member. Shear force and torque can be transmitted between ready-made pile members.

[Brief description of the drawings]

FIG. 1 is a perspective view showing how a pile flange is joined by a clamp and a bolt.

FIG. 2 is a cross-sectional view showing a state in which a pile flange is joined by a clamp and a bolt.

FIG. 3 is a longitudinal sectional view showing a state in which pile flanges are joined by the clamp shown in FIG.

FIG. 4 is a longitudinal sectional view showing a state of joining of a pile flange by a clamp and a bolt when the flange member is fixed to a ready-made concrete pile.

FIG. 5 is a cross-sectional view showing a state in which pile flanges are joined by crimp welding.

FIG. 6 is a perspective view showing a ready-made pile member to which a pile flange is fixed.

FIG. 7 is a perspective view showing a ready-made pile member when a projection is formed on a pile flange.

FIG. 8 is a perspective view showing a ready-made pile member to which an inner cylinder is fixed.

FIG. 9 is a perspective view showing a state in which pile flanges having protrusions are butted.

FIG. 10 is a perspective view showing a state in which a ready-made pile member having a convex portion and a ready-made pile member to which an inner cylinder having a concave portion is fixed are butted.

FIG. 11 is a perspective view showing a flange member.

FIG. 12 is an elevational view showing a state where a connected ready-made pile member is dropped into a drill hole.

FIG. 13 is an elevation view showing a state in which a connected ready-made pile member is installed underground while rotating.

FIG. 14 is an elevation view showing a conventional method of connecting steel pipe piles by welding joints.

[Explanation of symbols]

1 ... ready-made pile member, 11 ... inner cylinder, 12 ... convex part, 13 ... concave part, 2 ... pile flange, 20 ... flange member, 21 ... projection, 3 ... clamp, 31 ... flange , 32 ... bolt holes, 4 ...
... bolts, 5 ... nuts, 6 ... weld metal, 7 ... drilling wings, 8 ... rods.

Claims (6)

[Claims] 1. A joint structure in which pile flanges fixed to ends of two cylindrical ready-made pile members are joined to each other by abutting each other. A plurality of arcuate clamps having a cross-sectional shape sandwiched in the direction and having flanges formed to abut against each other at the ends are arranged, and flanges of adjacent clamps are bolted to each other. Joint structure of cylindrical ready-made pile members joined in the axial direction of the members. 2. A joint structure in which pile flanges fixed to the ends of two cylindrical ready-made pile members are joined to each other by abutting each other. A plurality of arcuate clamps having a cross-sectional shape sandwiching in the direction are arranged, the ends of adjacent clamps are welded to each other, and the clamps join the two pile flanges in the axial direction of the ready-made pile member. Joint structure of pile members. 3. The surface of the pile flange on the side of the prefabricated pile member to which it is fixed, and the surface of the cramp that contacts the surface, from the inner periphery to the outer periphery of the prefabricated pile member, from the side of the prefabricated pile member to the side of the pile flange. The joint structure for a cylindrical prefabricated pile member according to claim 1 or 2, wherein the joint structure is inclined. 4. The cylindrical prefabricated pile member according to claim 1, wherein projections engaging with each other in the circumferential direction are formed on opposite surfaces of both pile flanges of both prefabricated pile members. Joint structure. 5. The prefabricated cylindrical cylinder according to claim 1, wherein an inner cylinder inserted into the inside of the other prefabricated pile member is fixed to an inner periphery of one of the prefabricated pile members. Joint structure of pile members. 6. A protruding portion is formed on the inner periphery of the ready-made pile member on the side where the inner cylinder is inserted, and the protruding portion can be engaged in a circumferential direction of the pre-made pile member at a position corresponding to the protruding portion of the inner cylinder. The joint structure for a cylindrical prefabricated pile member according to claim 5, wherein a concave portion is formed.