JP2013133606A - Pile joint and connection method of pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile joint with light equipment for pile connection, and a connection method of a pile.SOLUTION: The pile joint comprises: end plates 2a, 2b provided with, on an outer periphery, a plurality of radial projections 21a, 21b and radial recesses 22a, 22b; and a joint ring 7 which is an integrated ring externally and loosely fitted to the radial projections 21a, 21b and radial recesses 22a, 22b and provided with recesses 71 and projections 72 of the same shape as the radial projections 21a, 21b and the radial recesses 22a, 22b on both ends in a pile axial direction of an inner periphery, and for which the pile axial direction inner measure interval of the recesses 71 and the projections 72 is a dimension to be loosely fitted to the pile axial direction total thickness dimension of the radial projections 21a, 21b and radial recesses 22a, 22b of the two end plates 2a, 2b abutted in the pile axial direction.

Description

  The present invention relates to a pile joint and a method for connecting piles.

  Conventionally, PC concrete piles are used as long foundation support materials by connecting the upper and lower PC concrete piles by mechanical joints that do not require on-site welding or on-site welding as shown in Patent Document 1 described later. .

  Welding joints require a welding technician, the work is dominated by the weather, and the strength of the weld depends on the operator's skill and is unreliable, and there are problems that require a long time for welding. . There is also a difficulty in securing qualified welding personnel.

  In order to solve this problem, the applicants have disclosed a mechanical pile joint structure that does not require field welding. The joint structure is divided into a plurality of semi-circular shapes in which one annular groove is provided at the end of the pile, and an annular protrusion that fits into the annular groove of both piles is provided on the inner diameter and the outer diameter is tapered. A cylindrical inner ring is externally fitted to the joint part of the pile, an outer ring having the same taper as the inner diameter of the inner ring is fitted on the inner surface, the outer ring is pressed in the longitudinal direction of the pile, and the taper This is a structure in which the inner ring is tightened to connect the piles (see, for example, Patent Document 1).

  The mechanical joint disclosed in Patent Document 1 has excellent characteristics and is awarded, but consists of a heavy inner and outer ring with a taper, and presses the outer ring in the longitudinal direction of the pile to tighten the inner ring. Therefore, a hydraulic jack (for example, four units having a capacity of 10 t) and a hydraulic pump are necessary, and there is a problem that a large-scale construction apparatus for connecting piles is necessary. In addition, since this joint has an outer diameter larger than the outer diameter of the pile, there is a high resistance when the pile is laid, and there is a high possibility that the pile will remain high.

  Moreover, the connection structure which does not require field welding is disclosed as a connection structure which connects steel pipe piles. The connection structure includes a female cylinder and a male cylinder that can be inserted into and removed from each other at the connection ends of the upper and lower steel pipe piles, and engages with a mating mating surface on the mating surface on the distal end side of the male and female cylinders In the connection structure in which arc plate-like protrusions are alternately provided in the circumferential direction and the male cylinder is inserted into the female cylinder and the upper and lower piles are rotated around each other to connect the upper and lower piles, the arc plate shape An indentation structure that engages with the circumferential groove provided in the counterpart cylinder is provided on the end face of the pile end of the protrusion, and the end face on the anti-pile end side of the arc plate-like protrusion is opposed to each other with a slit after connecting the upper and lower piles and This is a steel pipe pile connection structure in which the vertical axis forces of the upper and lower piles are perpendicular to the pile axis and a key member that transmits the rotational force to the upper and lower piles is interposed between the male and female cylinders (see, for example, Patent Document 2).

  The steel pipe pile connection structure disclosed in Patent Document 2 also has excellent characteristics and is used for awards, but because it is a connection structure that connects the upper and lower piles by rotating the upper and lower piles around the axis, There is a problem that a device for rotating a heavy pile is necessary, and a large-scale construction device for connecting the pile is necessary.

Japanese Patent No. 3271725 Japanese Patent No. 4456427

  In view of the above circumstances, an object of the present invention is to provide a pile joint and a pile connection method in which equipment for pile connection is light.

The pile joint of the present invention that achieves the above object is
An end plate provided with a plurality of radial convex recesses on the outer periphery;
It is an integral ring that fits and fits in the radial convex and concave portions, and has concave and convex portions having the same shape as the radial convex and concave portions at both ends in the pile axial direction on the inner circumference, and the internal axial distance between the concave and convex portions is A joint ring that is a dimension that loosely fits in the pile axial direction total thickness dimension of the radial convex recesses of the two end plates brought into contact with the pile axial direction;
It is characterized by comprising.

  Here, the end plate is provided at the upper and lower ends of the pile in the concrete pile, and serves as a connecting portion of the upper and lower piles as well as the fixing portion of the PC steel wire. In recent years, mechanical connection has been mainly used. Steel pipe piles often do not have an end plate, and many pipes are subjected to various processing for connection.

  In the pile joint of the present invention, an end plate having a plurality of radial convex recesses on the outer periphery is used. The radial convex recess is formed by projecting a plurality of protrusions on the outer periphery, and a circumferential portion between the outer protrusions is a recess. And the pile joint of this invention is comprised by the combination of the end plate of an up-and-down pile, and the joint ring which carries out external fitting to this. The protrusions provided on the end plate may be of any size, shape, number, and arrangement, but the joint ring is fitted to form a pile joint, so the external force that the pile receives, that is, axial force, bending load, shear It is necessary to have sufficient strength against the load. It is preferable that the outer diameter of the joint ring is not increased within a range that satisfies this requirement.

  Considering such requirements and ease of processing, the radial height of the radial convex recesses is the same, and the outer periphery is shaped, dimensioned, and arrayed so that the radial convex portions and the radial concave portions are equally sized, and numerical control It is most preferable to have a module that can be easily machined by machining.

  The joint ring according to the present invention is externally fitted to the end plates attached to the upper and lower piles, and has inward concavo-convex portions on the inner circumferences at both ends in the pile axial direction. Engage with the radial projections of the end plate so as to be sandwiched from both sides in the pile axial direction. This joint ring makes the effective cross-sectional area of the ring strong enough to fit the pile joint. In addition, the inward convex portion of the joint ring also defines a shape such as a thickness so as to satisfy the mechanical requirements of the pile joint.

  The pile joint of the present invention that satisfies these conditions significantly reduces the protruding dimension from the outer diameter of the pile (the outer diameter of the pile joint) and is lighter in weight than conventional mechanical joints (non-welded joints). It can be. In addition, the construction work for connecting this pile joint is carried out by fitting a relatively lightweight joint ring to the end plate of the lower pile and aligning the circumferential position of the radial convex recesses of the end plate with the upper pile. It is made by lifting the joint ring externally fitted to the end plate of the lower pile and rotating it around the pile axis. Since the dimensions are machined into a loose fit with a slight gap between each other, there is no need for a large-scale construction device for connecting the piles, and it is possible to use light equipment that rotates the joint ring around the pile axis. Is very simple and easy.

  In the pile joint of the present invention, it is preferable that the end plate includes a shear key for preventing the relative rotation of the upper and lower piles. According to the pile joint provided with such a shear key, the upper and lower piles can be easily aligned, and shear strength is imparted to the joint portion, and the rotational force at the time of rotary embedding of the pile is transmitted by the shear key. The The shear key may be, for example, a pin and a pin fitting hole, and the size, number, arrangement, etc. of the shear key can be appropriately determined by design.

  In the pile joint of the present invention, the surface on the side opposite to the pile end of the radial protrusion of the end plate is an inclined surface that is inclined in a direction away from the end surface on the pile end side toward the outer periphery. It is also a preferred form that the normal distance in the pile axis direction is a shape that follows the inclined slope. According to such a preferable form, after connecting the upper and lower piles, the slopes mesh with each other, so that even if subjected to the action of bending, the joint ring is unlikely to come off in the outer direction, and the reduction in yield strength caused by bending deformation of the end plate is prevented. Can do.

  In the pile joint of the present invention, it is further preferable that the ridge angle portion on one end side in the circumferential direction on the inner side of the uneven portion of the joint ring is chamfered. According to such a preferable embodiment, when the joint ring is rotated around the pile axis, it is prevented from being caught by the ridge angle portion, and the joint ring can be easily rotated.

  Moreover, it is preferable that the pile joint of this invention was further equipped with the rotation prevention member which prevents the relative rotation of the said end plate and the said joint ring. It is also a preferred embodiment that the rotation preventing member is a shear key having a size and shape that can be accommodated in both the radial concave portion of the end plate and the concave portion of the joint ring. According to the pile joint provided with such a rotation preventing member, the end plate and the joint ring are fixed. For example, when the pile is set in the ground while rotating the pile, the connection portion is loosened or detached. Can be suitably prevented.

In addition, the pile connection method of the present invention that achieves the above object
The joint ring of the present invention is externally fitted to the top of the lower pile on which the end plate of the present invention is mounted, and the radial piles provided on the outer periphery of the end plates of the upper and lower piles are aligned in the circumferential position of the upper pile. Placed,
Raise the joint ring to a position that fits over the upper and lower end plates, rotate it around the pile axis, engage with the upper and lower end plates,
Next, the end plate and the joint ring are fixed.

  According to the method for connecting piles of the present invention, a relatively lightweight joint ring is fitted on the end plate of the lower pile, and the circumferential positions of the radial convex recesses of the end plate are matched to mount the upper pile on the lower pile. The joint ring that is externally fitted to the end plate of the lower pile is lifted and rotated around the pile axis, the upper and lower end plates are engaged with the joint ring, and the end plate and the joint ring are fixed. . Since the dimensions are processed into loose fit with a slight gap between each other, there is no need for a large-scale construction device for connecting piles, and it is a light piece that rotates a relatively lightweight joint ring around the pile axis. Good. Therefore, the work is extremely simple and easy.

  ADVANTAGE OF THE INVENTION According to this invention, the connection method of a pile joint and the pile whose equipment for a pile connection is light equipment is provided.

It is the perspective view which looked at the up-and-down PC concrete pile and joint ring to which one embodiment of the pile joint of the present invention was applied diagonally from the bottom. It is the perspective view which looked at the up-and-down PC concrete pile and joint ring shown in FIG. 1 from diagonally upward. FIG. 3 is an enlarged plan view of a portion A shown in FIG. 1 and a portion B shown in FIG. 2. FIG. 3 is an enlarged plan view of a portion C shown in FIGS. 1 and 2. FIG. 3 is a longitudinal sectional view taken along line DD shown in FIGS. 1 and 2. It is a side view which shows a lower PC concrete pile embedding process. It is a side view which shows a pin fitting process. It is a side view which shows a coupling ring external fitting process. It is a top view which shows a part of end plate shown in FIG. 8, and a part of coupling ring. It is a side view which shows an upper PC concrete pile mounting process. It is an enlarged side view of the E section shown in FIG. It is a side view which shows the engagement process of the end plate and joint ring which were contact | abutted to the pile axial direction. It is a top view which shows a part of end plate of a top PC concrete pile, and a part of joint ring in the process in which the joint ring 7 is rotated around a pile axis. It is a longitudinal cross-sectional view along line FF shown in FIG. It is a side view which shows the fixing process of two end plates and the coupling ring which were contact | abutted to the pile axial direction. It is a perspective view which shows the fixing process of two end plates and the coupling ring which were contact | abutted to the pile axial direction. It is a top view which shows a part of end plate of a top PC concrete pile shown in FIG. 15, FIG. 16, and a part of joint ring. It is the perspective view which looked at the shear key used for 2nd Embodiment of the pile joint of this invention from diagonally upward. It is a perspective view which shows the modification of the shear key shown in FIG. It is a longitudinal cross-sectional view of the joint part which shows the fixing process of two end plates and the joint ring which were contact | abutted to the pile axial direction in 2nd Embodiment of the connection method of the pile of this invention. It is a top view which shows a part of end plate of an upper PC concrete pile shown in FIG. 20, and a part of joint ring.

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

  FIG. 1 is a perspective view of an upper and lower PC concrete pile and a joint ring to which an embodiment of the pile joint of the present invention is applied as viewed obliquely from below, and FIG. 2 is an upper and lower PC concrete pile and a joint ring shown in FIG. It is the perspective view which looked at from diagonally upward. 3 is an enlarged plan view of a portion A shown in FIG. 1 and a portion B shown in FIG. FIG. 4 is an enlarged plan view of a portion C shown in FIG. FIG. 5 is a longitudinal sectional view taken along line DD shown in FIGS. 1, 2, and 5 show the upper and lower PC concrete piles and the joint ring in a state before connection.

  The upper PC concrete pile 1a shown in FIGS. 1 to 3 and 5 is a precast concrete pile in which one end of a PC steel bar 3 is fixed to an end plate 2a at the lower end and prestress is introduced into the concrete 4. A coated metal cylinder 5a for reinforcing the end portion is provided on the outer periphery in the vicinity of the end portion of the upper PC concrete pile 1a. A diameter-reduced portion 51a having a diameter smaller than that of the concrete 4 portion is formed in a portion of the coated metal cylinder 5a adjacent to the end plate 2a. Furthermore, a tapered portion 52a having a gradually increasing diameter is formed in a portion of the coated metal cylinder 5a adjacent to the reduced diameter portion 51a. On the outer periphery of the end plate 2a, a plurality of contoured radial convex portions 21a and a plurality of contoured radial concave portions 22a are provided alternately so that the radial convex portions 21a and the radial concave portions 22a are divided into equal dimensions. ing. That is, a plurality of protrusions are provided on the outer periphery of the end plate 2a, and the circumferential portion between the outer protrusions is a recess. As will be described later, since the joint ring 7 is externally engaged to form a pile joint, the radial protrusion 21a has sufficient strength against the external force received by the pile, that is, axial force, bending load, and shear load. It has projections. Moreover, as shown in FIG. 5, the surface 23a on the anti-pile end side of the radial protrusion 21a has a slope inclined in a direction away from the pile end side end surface 24a toward the outer periphery. Moreover, the pin fitting hole 25a with which the pin 6 (refer FIG. 7) mentioned later is fitted is provided in the pile end side end surface 24a of the end plate 2a at equal intervals. The pin 6 imparts a shear strength to the joint portion, prevents relative rotation of the upper and lower PC concrete piles 1a and 1b, and transmits a rotational force when the pile is buried. The pin 6 also facilitates the alignment of the upper and lower PC concrete piles 1a and 1b. The size, number, arrangement, etc. of the pins 6 can be appropriately determined by design. The end plate 2a described above is an embodiment of the end plate according to the present invention, and the radial convex portions 21a and the radial concave portions 22a are embodiments of the radial convex recess according to the present invention. The pin 6 is an example of the shear key referred to in the present invention.

  The lower PC concrete pile 1b shown in FIGS. 1 to 3 and FIG. 5 also introduces pre-stress into the concrete 4 by fixing one end of the PC steel bar 3 to the end plate 2b at the upper end of the lower PC concrete pile 1a. Precast concrete pile. Similarly to the upper PC concrete pile 1a, a coated metal cylinder 5b for reinforcing the end portion is also provided on the outer periphery in the vicinity of the end portion of the lower PC concrete pile 1b. A diameter-reduced portion 51b having a diameter smaller than that of the concrete 4 portion is also formed in a portion of the coated metal cylinder 5b adjacent to the end plate 2b. Further, a tapered portion 52b whose diameter gradually increases is formed in a portion adjacent to the reduced diameter portion 51b of the coated metal cylinder 5b. The end plate 2b is an end plate having the same shape as the end plate 2a of the upper PC concrete pile 1a. That is, on the outer periphery of the end plate 2b, a plurality of contoured radial convex portions 21b and a plurality of contoured radial concave portions 22b are alternately arranged so that the radial convex portions 21b and the radial concave portions 22b are equally divided. Is provided. And as shown in FIG. 5, the surface 23b of the radial convex part 21b on the anti-pile end side also has a slope inclined in a direction away from the pile end side end face 24b toward the outer periphery, like the upper PC concrete pile 1a. . Moreover, the pin fitting hole 25b by which the pin 6 (refer FIG. 7) mentioned later is fitted is provided in the pile end side end surface 24b of the end plate 2b at equal intervals. The end plate 2b described above is also an embodiment of the end plate referred to in the present invention, and the radial convex portion 21b and the radial concave portion 22b are also embodiments of the radial convex recess described in the present invention.

  Here, the radial convex portions 21a and 21b and the radial concave portions 22a and 22b of the end plates 2a and 2b will be specifically described.

  The upper and lower PC concrete piles 1a and 1b shown in FIGS. 1, 2 and 5 are piles having a pile diameter of 400 mm. And the total number of the radial convex part 21a and the radial recessed part 22a and the total number of the radial convex part 21b and the radial recessed part 22b are made into the number which multiplied 0.08 to the pile diameter (mm). Specifically, the number is 32 times 400 mm multiplied by 0.08. That is, 16 radial convex portions 21a and 16 radial concave portions 22a are provided on the outer periphery of the end plate 2a of the upper PC concrete pile 1a. Moreover, 16 radial convex parts 21b and 16 radial concave parts 22b are also provided on the outer periphery of the end plate 2b of the lower PC concrete pile 1b. Thus, even if it is a case where a pile from which a pile diameter (mm) differs is determined by determining the number of radial convex parts 21a and 21b and radial concave parts 22a and 22b, radial convex parts 21a and 21b and radial concave parts are used. The circumferential lengths of 22a and 22b are made equal (39.27 mm). Therefore, it is easy to process by numerical control cutting. When the total number of the radial convex portions 21a and the radial concave portions 22a and the total number of the radial convex portions 21b and the radial concave portions 22b are, for example, the number obtained by multiplying the pile diameter (mm) by 0.06, the radial convex portions 21a, The circumferential lengths of 21b and the radial recesses 22a and 22b are increased, and the stress transmission efficiency of the two end plates 2a and 2b may be reduced. Moreover, when the total number is a number obtained by multiplying the pile diameter (mm) by, for example, 0.10, the circumferential length is reduced, and the processing efficiency is lowered due to a large amount of uneven processing during production, When a bending moment is applied to the joint, there is a risk of disengagement due to the small size of each engaging portion.

  Next, the joint ring 7 will be described.

  The joint ring 7 shown in FIGS. 1, 2, 4, and 5 is a ring that fits over the end plate 2a of the upper PC concrete pile 1a and the end plate 2b of the lower PC concrete pile 1b. More specifically, the joint ring 7 is a ring that fits with a slight clearance into the radial convex portions 21a and 21b and the radial concave portions 22a and 22b of the two end plates 2a and 2b abutted in the pile axis direction. And it is the integral ring which provided the recessed part 71 and the inward convex part 72 which are the same shape as the radial convex parts 21a and 21b and the radial recessed parts 22a and 22b, respectively at the both ends of the inner periphery in the pile axial direction. As will be described later, since the convex portion 72 engages the radial convex portions 21a and 21b of the two end plates 2a and 2b so as to be sandwiched from both sides in the pile axial direction, the joint ring 7 is effective in crossing the ring. The area is assumed to be strong enough to fit the pile joint. Moreover, the shape of thickness etc. is defined so that the convex part 72 may also satisfy the mechanical requirements of a pile joint. In addition, the internal distance in the pile axis direction between the concave portion 71 and the convex portion 72 of the joint ring 7 is such that the radial convex portions 21a and 21b and the radial concave portions 22a of the two end plates 2a and 2b abutted in the pile axial direction, It is the dimension which fits with a slight clearance gap in the pile axial direction total thickness dimension of 22b. Furthermore, the end plate when the inner axial distance between the concave portion 71 and the convex portion 72 of the joint ring 7 abuts the two end plates 2a and 2b in the pile axial direction as shown in FIG. The size following both slopes of the inclined slope on the surface 23a on the anti-pile end side of the radial convex portion 21a of 2a and the inclined slope on the surface 23b on the anti-pile end side of the radial convex portion 21b of the end plate 2b It has become. Further, the ridge angle portion 73 on one end side in the circumferential direction on the inner side of the concave portion 71 and the convex portion 72 of the joint ring 7 is chamfered. Therefore, as will be described later, when the joint ring 7 is rotated around the pile axis, it is prevented from being caught by the ridge angle portion 73, and the joint ring 7 can be easily rotated. Further, the joint ring 7 is a position adjacent to the one convex portion 72 in the circumferential direction in each of the concave portions 71 adjacent to the one convex portion 72 of the plurality of convex portions 72, and the pile shaft At an intermediate position in the direction, a tap hole 76 that penetrates between the outer peripheral surface 74 and the inner peripheral surface 75 and into which a bolt 8 (see FIGS. 15 to 17) to be described later is screwed is formed. Although detailed description will be given later, the bolt 8 is configured to fix the two end plates 2a and 2b abutted in the pile axis direction and the joint ring 7 to rotate the joint ring 7 around the pile axis. It is the rotation prevention member which prevents a movement. The joint ring 7 described above is an embodiment of the joint ring referred to in the present invention, and the concave portion 71 and the convex portion 72 are embodiments of the concave and convex portion referred to in the present invention. Moreover, the bolt 8 is an embodiment of the rotation preventing member according to the present invention.

  The pile joint composed of the end plates 2a, 2b and the joint ring 7 configured as described above has a protruding dimension from the outer diameter of the pile (the outer diameter of the pile joint) as compared with the conventional mechanical joint (non-welded joint). ) Can be significantly reduced and the weight can be reduced. In addition, the construction work for connecting the pile joint includes two end plates in which a relatively lightweight joint ring 7 is externally fitted to the end plate 2b of the lower PC concrete pile 1b and brought into contact with the pile axial direction. The upper PC concrete pile 1a is placed on the lower PC concrete pile 1b with the radial convex portions 21a, 21b and radial concave portions 22a, 22b of the 2a, 2b being aligned in the circumferential direction, and externally fitted to the two end plates 2a, 2b. This is done by turning the joint ring 7 around the pile axis. Since the dimensions are processed in a loosely fitted state with a slight gap between each other, a large-scale construction device for connecting the piles is not necessary, and light fittings that rotate the joint ring 7 around the pile axis may be used. Work is very simple and easy.

  Further, as described above, the surfaces 23a, 23b on the side opposite to the piles of the radial projections 21a, 21b of the end plates 2a, 2b are inclined so as to be inclined away from the pile end side end surfaces 24a, 24b toward the outer periphery. And the internal spacing in the pile axis direction of the concave portion 71 and the convex portion 72 of the joint ring 7 follows both slopes when the two end plates 2a and 2b are brought into contact with the pile axial direction. Due to the dimensions, after connecting the upper and lower PC concrete piles 1a, 1b, the slopes mesh with each other, and even when subjected to the action of bending, the joint ring 7 is unlikely to come off, and the end plates 2a, 2b A decrease in yield strength caused by bending deformation can be prevented.

  Moreover, since the end plates 2a and 2b and the joint ring 7 are manufactured at a factory where quality control is performed, those of stable quality are supplied. Therefore, the joint performance is stable and stable.

  Next, an embodiment of a method for connecting piles according to the present invention will be described. In addition, the connection method of the pile demonstrated below is a connection method of the upper and lower PC concrete piles 1a and 1b using the upper and lower PC concrete piles 1a and 1b and the joint ring 7 which were demonstrated with reference to FIGS.

  Hereinafter, the same symbols are attached to the elements in the upper and lower PC concrete piles 1a and 1b and the joint ring 7 described with reference to FIGS. I will explain.

  FIG. 6 is a side view showing a lower PC concrete pile burying step.

  First, the lower PC concrete pile 1b fitted with the end plate 2b is submerged in the ground while rotating and changing the rotation direction as necessary. At this time, at least the reduced diameter portion 51b and the tapered portion 52b of the coated metal cylinder 5b and the end plate 2b are exposed.

  FIG. 7 is a side view showing the pin fitting step.

  The pile end side end surface 24b is cleaned, and a rust inhibitor is applied to the pile end side end surface 24b. Thereafter, the pin fitting hole 25b provided in the end plate 2b of the lower PC concrete pile 1b sunk with the reduced diameter portion 51b and the tapered portion 52b of the coated metal cylinder 5b and the end plate 2b exposed (see FIG. 2). ) And the pin 6 is fitted. At this time, a part of the pin 6 is projected from the pile end side end surface 24b.

  FIG. 8 is a side view showing the joint ring external fitting step. In addition, the longitudinal cross-section is shown about the coupling ring shown in FIG. FIG. 9 is a plan view showing a part of the end plate and a part of the joint ring shown in FIG.

  A joint ring 7 in which a rust preventive agent is applied to the inner peripheral surface 75 is externally fitted to the top of the lower PC concrete pile 1b set in the above-described state. More specifically, as shown in FIG. 9, the radial projection 21b of the end plate 2b of the lower PC concrete pile 1b is opposed to the concave 71 of the joint ring 7 so that the joint ring 7 is placed on the top of the lower PC concrete pile 1b. Fits outside. At this time, the lower end of the joint ring 7 is dropped to the lower end of the reduced diameter portion 51b in the coated metal cylinder 5b of the lower PC concrete pile 1b, and the joint ring 7 is received by the tapered portion 52b adjacent to the reduced diameter portion 51b. It becomes a state.

  FIG. 10 is a side view showing the upper PC concrete pile placing step. In addition, the longitudinal cross-section is shown about the coupling ring shown in FIG. FIG. 11 is an enlarged side view of an E portion shown in FIG.

  The upper PC concrete pile 1a coated with a rust preventive agent on the pile end side end face 24a (see FIG. 1) is placed on the lower PC concrete pile 1b. At this time, a part of the pin fitting hole 25a (see FIG. 1) provided in the end plate 2a of the upper PC concrete pile 1a was protruded from the pile end side end surface 24b (see FIG. 7) of the lower PC concrete pile 1b. The pin 6 (refer FIG. 7) of a state is fitted. The pin 6 functions as an alignment member for the upper and lower PC concrete piles 1a and 1b, and is provided on the outer periphery of each of the two end plates 2a and 2b abutted in the pile axial direction as shown in FIG. The radial convex portions 21a and 21b and the radial concave portions 22a and 22b are in a state in which the circumferential positions match.

  FIG. 12 is a side view showing an engagement process between two end plates brought into contact with the pile axis direction and the joint ring. In addition, the longitudinal cross-section is shown about the coupling ring shown in FIG. FIG. 13 is a plan view showing a part of the end plate of the upper PC concrete pile and a part of the joint ring in the process of rotating the joint ring 7 around the pile axis. FIG. 14 is a longitudinal sectional view taken along line FF shown in FIG.

  The joint ring 7 in a state of being received by the tapered portion 52b adjacent to the reduced diameter portion 51b is raised to a position where the joint ring 7 is fitted to the two end plates 2a and 2b abutted in the pile axis direction. Thereafter, the joint ring 7 is rotated around the pile axis (in the direction of arrow G shown in FIG. 13) by the width of the convex portion 72 (the length in the circumferential direction). Specifically, for example, a key portion of a rod (not shown) having an L-shaped key portion at the tip portion is used as a tap hole 76 formed in the joint ring 7 (see FIGS. 1, 2, and 4). ) To rotate the joint ring 7. By such rotation of the joint ring 7, the convex part 72 of the joint ring 7 overlaps with the radial convex parts 21a and 21b of the two end plates 2a and 2b abutted in the pile axial direction with respect to the pile axial direction. The convex portion 72 engages so as to sandwich the radial convex portions 21a and 21b of the two end plates 2a and 2b from both sides in the pile axis direction. As a result, the two end plates 2a and 2b and the joint ring 7 are engaged. As described above and as shown in FIG. 14, the surfaces 23 a and 23 b on the side opposite to the pile of the projecting convex portions 21 a and 21 b of the end plates 2 a and 2 b extend from the end surfaces 24 a and 24 b on the pile end side toward the outer periphery. It has an inclined surface that is inclined in the direction of separation, and the internal distance in the pile axial direction of the concave portion 71 and the convex portion 72 of the joint ring 7 is when the two end plates 2a and 2b are brought into contact with the pile axial direction. Since the dimensions follow the slopes of both of them, even if the convex portion 72 and the radial convex portions 21a and 21b are engaged with each other and subjected to a bending action, the joint ring 7 is difficult to come off.

  FIG. 15 is a side view showing a fixing process between the two end plates brought into contact with the pile axial direction and the joint ring, and FIG. 16 is a perspective view thereof. FIG. 17 is a plan view showing a part of the end plate of the upper PC concrete pile shown in FIGS. 15 and 16 and a part of the joint ring.

  The bolt 8 is screwed into the tap hole 76 from the outer peripheral surface 74 side of the joint ring 7. The bolt 8 used here is a bolt having a nominal length slightly shorter than the thickness of the portion where the convex portion 72 of the joint ring 7 is formed. As described above, the joint ring 7 is a position adjacent to the one convex portion 72 in the circumferential direction in each of the concave portions 71 adjacent to the one convex portion 72 of the plurality of convex portions 72, and A tap hole 76 penetrating between the outer peripheral surface 74 and the inner peripheral surface 75 is formed at an intermediate position in the pile axis direction. Therefore, when the bolt 8 having the nominal length as described above is screwed into the tap hole 76, the portion of the shaft portion 81 of the bolt 8 that protrudes from the tap hole 76 is the radial protrusion of the end plates 2 a and 2 b. It will be located in the vicinity of the part adjacent to the radial recessed parts 22a and 22b in the parts 21a and 21b. This prevents the joint ring 7 from rotating around the pile axis. That is, the two end plates 2a and 2b and the joint ring 7 which are brought into contact with each other in the pile axial direction are fixed by the bolt 8, and the upper and lower PC concrete piles 1a and 1b are connected.

  The PC concrete pile formed by connecting the upper and lower PC concrete piles 1a and 1b is often set in the ground while being rotated, and the rotation direction may be changed. By using the bolt 8 described above, when the PC concrete pile is reversed, it is possible to suitably prevent the connection portion from being loosened or detached.

  According to the pile connection method of the embodiment described above, the two ends of the relatively lightweight joint ring 7 fitted on the end plate 2b of the lower PC concrete pile 1b and abutted in the pile axial direction. The upper PC concrete pile 1a is placed on the lower PC concrete pile 1b with the radial convex portions 21a, 21b and the radial concave portions 22a, 22b positioned in the circumferential direction of the plates 2a, 2b, and the two end plates 2a, 2b are outside. By rotating the fitted joint ring 7 around the pile axis, the two end plates 2a, 2b and the joint ring 7 are engaged, and the two end plates 2a, 2b and the joint ring 7 are fixed. Made. Since the dimensions are machined into a loose fit with a slight gap between each other, there is no need for a large-scale construction device for connecting the piles, and a lightweight one that rotates the relatively lightweight joint ring 7 around the pile axis. It's okay. Therefore, the work is extremely simple and easy.

  Moreover, since the time required for the connection of the joint portion is remarkably short compared to the case where the mechanical joint disclosed in Patent Document 1 described above (hereinafter referred to as a conventional mechanical joint) is used, the pile construction capacity Is improved. Specifically, for example, in the case of a PC concrete pile having a pile diameter of 300 mm to 600 mm, the time required for connecting the joint portion is about 5 minutes in the conventional mechanical joint, whereas in this embodiment, it is about 1 Minutes. Further, for example, in the case of a PC concrete pile having a pile diameter of 700 mm to 900 mm, the time required for connection of the joint portion is about 10 minutes in the conventional mechanical joint, and is about 2 minutes in this embodiment. . Further, for example, in the case of a PC concrete pile having a pile diameter of 1000 mm to 1200 mm, the time required for connecting the joint portion is about 15 minutes in the conventional mechanical joint, whereas in this embodiment, it is about 3 minutes. .

  Moreover, since the protrusion dimension of the joint ring 7 from the upper and lower PC concrete piles 1a, 1b is significantly smaller than when using a conventional mechanical joint, the resistance during pile laying is small, and the pile stays high. Is unlikely to occur. Specifically, for example, in the case of a PC concrete pile having a pile diameter of 300 mm, the protrusion amount is 16.5 mm in the conventional mechanical joint, but is 9.0 mm in this embodiment. For example, in the case of a PC concrete pile having a pile diameter of 1200 mm, the protrusion amount is 32.0 mm in the conventional mechanical joint, whereas in this embodiment, it is 22.0 mm.

  Moreover, according to the connection method of the pile of this embodiment, after removing the volt | bolt 8 screwed in the tap hole 76 of the joint ring 7, the joint ring 7 is made into the width | variety (circumferential direction length) of the convex part 72. Since the pile can be removed by rotating around the pile axis by that amount, if a high stop occurs when the pile is laid, it can be pulled out while removing the pile. Therefore, the removed pile and joint ring 7 can be reused.

  Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is different from the above-described embodiment in that a shear key 9 is used instead of the bolt 8 described above.

  In the following, the same elements as those in the above-described embodiment will be denoted by the same reference numerals, and repeated description will be omitted while focusing on the differences.

  FIG. 18: is the perspective view which looked at the shear key used for 2nd Embodiment of the pile joint of this invention from diagonally upward. FIG. 19 is a perspective view showing a modification of the shear key shown in FIG. Moreover, FIG. 20 is a longitudinal cross-sectional view of a joint portion showing a fixing process between two end plates brought into contact with the pile axial direction and the joint ring in the second embodiment of the pile connecting method of the present invention. is there. FIG. 21 is a plan view showing a part of the end plate of the upper PC concrete pile shown in FIG. 20 and a part of the joint ring. FIG. 20 shows both the shear key just before being housed in both the radial recesses 22a and 22b and the recess 71 of the joint ring 7, and the shear key housed in both of them.

  The shear key 9 shown in FIG. 18 fixes the two end plates 2a and 2b abutted in the pile axis direction and the joint ring 7 to prevent the joint ring 7 from rotating around the pile axis. It is a member. More specifically, the shear key 9 is a shear key in which six bar members 91 are connected with a space therebetween using two deformable wire members 92 such as iron wires. The shear key 9 is a shear key having a size and shape that can be stored in both the radial recesses 22a and 22b of the two end plates 2a and 2b abutted in the pile axis direction and the recess 71 of the joint ring 7. is there. In FIG. 18, a bar having a rectangular cross-sectional shape is shown as the bar 91. However, the bar 91 may be a bar having a circular cross-sectional shape, for example. Further, FIG. 18 shows a shear key 9 in which six rods 91 are connected with an interval using two wire rods 92. However, like the shear key 9 ′ shown in FIG. The six bar members 91 may be connected to a deformable sheet-like member 93 such as a polyvinyl chloride sheet by bonding at intervals. Such shear keys 9, 9 'are also examples of the rotation preventing member according to the present invention.

  In the second embodiment, since the shear key 9 is used in place of the bolt 8 (see FIGS. 15 to 17) described above, the joint ring 7 used in the second embodiment has a tap hole 76 (FIGS. 1 and 2). , See FIG. 4). Therefore, in the second embodiment, there is no strength reduction of the joint ring 7 due to the formation of a tap hole into which a bolt as a rotation preventing member is screwed.

  In the fixing process of the two end plates 2a and 2b and the joint ring 7 that are in contact with each other in the pile axis direction, as shown in FIG. 20, the radial recesses 22a and 22b of the two end plates 2a and 2b and the joint ring 7 In this case, the shear key 9 is inserted into both of the concave portion 71 and the concave portion 71 so as to be accommodated. At this time, the lower end of the shear key 9 is dropped to the lower end of the reduced diameter portion 51b in the coated metal cylinder 5b of the lower PC concrete pile 1b, and the shear key 9 is received by the tapered portion 52b adjacent to the reduced diameter portion 51b. It becomes. Since the shear key 9 has a size and shape that can be accommodated in both the radial recesses 22a and 22b and the recess 71 of the joint ring 7 as described above, both side ends of the shear key 9 are end portions as shown in FIG. It will be located in the vicinity of the part adjacent to the radial recessed parts 22a and 22b in the radial convex parts 21a and 21b of board 2a, 2b. This prevents the joint ring 7 from rotating around the pile axis. That is, the two end plates 2a and 2b and the joint ring 7 which are brought into contact with each other in the pile axial direction are fixed by the shear key 9, and the upper and lower PC concrete piles 1a and 1b are connected.

  Even if the shear key 9 is used instead of the bolt 8 (see FIGS. 15 to 17) described above, it is possible to suitably prevent the connection portion from loosening or coming off when the PC concrete pile is reversed. .

  Above, description of 2nd Embodiment of this invention is complete | finished.

  In each of the above-described embodiments, the radial convex and concave portions referred to in the present invention have been described with reference to an example of a uniform radial convex and concave portion. However, the radial convex and concave portions referred to in the present invention are not limited thereto. Radial convex and concave portions having different heights may be used.

  Moreover, in each embodiment mentioned above, although the radial convex-concave part said to this invention demonstrated and demonstrated the example provided at equal intervals, the radial convex-concave part said to this invention is not restricted to this, You may provide at arbitrary intervals which are not equal intervals.

  Moreover, in each embodiment mentioned above, although the end plate said to this invention gave and demonstrated the example with which the precast concrete pile was mounted | worn, the end plate said to this invention is not restricted to this, For example, It may be an end plate attached to a concrete pile such as an SC pile or a PRC pile or an end plate welded to a steel pipe pile.

  In the above-described embodiment, the example in which the rotation preventing member according to the present invention is a bolt or a shear key has been described. However, the rotation preventing member according to the present invention is not limited to these, Any member that prevents relative rotation between the plate and the joint ring may be used.

1a Upper PC concrete pile 1b Lower PC concrete pile 2a, 2b End plate 21a, 21b Radial convex portion 22a, 22b Radial concave portion 23a, 23b Anti-pile end side surface 24a, 24b Pile end side end surface 25a, 25b Pin fitting hole 3 PC steel bar 4 Concrete 5a, 5b Coated metal cylinder 51a, 51b Reduced diameter part 52a, 52b Tapered part 6 Pin 7 Joint ring 71 Recessed part 72 Convex part 73 Ridge angle part 74 Outer peripheral surface 75 Inner peripheral surface 76 Tap hole 8 Bolt 81 Shaft 9 Shear key 91 Bar material 92 Wire material 93 Sheet-like member

Claims (7)

An end plate provided with a plurality of radial convex recesses on the outer periphery;
It is an integral ring that fits and fits in the radial convex and concave portions, and has concave and convex portions having the same shape as the radial convex and concave portions at both ends in the pile axial direction on the inner periphery, and the internal distance in the pile axial direction of the concave and convex portions is A joint ring that is a dimension that loosely fits in the pile axis direction total thickness dimension of the radial convex recesses of the two end plates abutted in the pile axis direction;
A pile joint characterized by comprising:   The pile joint according to claim 1, wherein the end plate includes a shear key that prevents relative rotation of the upper and lower piles.   The surface on the anti-pile end side of the radial convex portion of the end plate is a slope inclined in a direction away from the end surface on the pile end side toward the outer periphery, and the internal axial distance between the concave and convex portions of the joint ring is The pile joint according to claim 1 or 2, wherein the pile joint has a shape that follows an inclined slope.   The pile joint according to any one of claims 1 to 3, wherein a ridge angle portion on one end side in the circumferential direction on the inner side of the concavo-convex portion of the joint ring is chamfered.   The pile joint according to any one of claims 1 to 4, further comprising a rotation preventing member that prevents relative rotation between the end plate and the joint ring.     6. The pile joint according to claim 5, wherein the rotation preventing member is a shear key having a size and a shape that can be accommodated in both a radial concave portion of the end plate and a concave portion of the joint ring. The joint ring according to claim 1 is externally fitted to the top of the lower pile on which the end plate according to claim 1 is mounted, and the circumferential positions of the radial convex recesses provided on the outer periphery of the end plates of the upper and lower piles are made to coincide with each other. Placed
The joint ring is raised to a position where it is externally fitted to the upper and lower end plates, rotated around the pile axis, and engaged with the upper and lower end plates,
Then, the connection method of the pile characterized by fixing the said end plate and the said joint ring.

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