JP2005105618A - Joint structure of upper and lower piles in rotary press-fitting pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of upper and lower piles in a rotary press-fitting pile capable of easily joining the upper pile with the lower pile, transmitting both of forward rotation for driving into the upper pile and reverse rotation for pulling it up to the lower pile securely, and providing firm rigidity of a joint part of the upper and lower piles against bending. <P>SOLUTION: A female joint 1 is provided with a circular guide hole part 6 and a rotary engaging female hole part 7 having drum-like cross section. A male joint 2 is provided with a rotary engaging male part 14 having drum-like cross section and a male part 15 having circular outer periphery. The rotary engaging male part 14 and the rotary engaging female hole part 7 are fitted and the circular guide hole part 6 and the outer peripheral circular male part 15 are fitted mutually. Pins 3, 3 are inserted in the fitting condition. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a joint structure of upper and lower piles in a rotary press-fit pile.

  In the rotary press-fit pile, in order to drive the pile deep into the ground, after driving the first pile, the lower end of the second pile is joined to the upper end of the pile, and further driven In some cases, piles are piled up using the pile splicing method.

  As a method for jointing the upper and lower piles in such a case, conventionally, the upper and lower piles have been jointed by welding or using a screw joint.

  However, in the joint by welding, the work is easily influenced by the weather, the quality control of the joint is not easy, and there is a problem that a special skill is required for the joint.

  In addition, in joints using threaded joints, screwing is troublesome, and if you attempt to displace the pile in the pulling direction during or after pile driving, the screw will loosen and There is a problem that the force may not be transmitted well to the lower pile.

  In view of the problems as described above, the present invention can easily join the upper pile and the lower pile, and reliably perform both the positive rotation and the reverse drawing rotation to the upper pile. Another object is to provide a joint structure for the upper and lower piles in the rotary press-fit pile that can be transmitted and, in addition, the rigidity of the joint portion of the upper and lower piles against bending can be made firm.

The above problem is that either the female joint or the male joint is provided at the upper end of the lower pile, and the other joint is provided at the lower end of the upper pile, and these male and female joints are jointed. The joint structure of the upper and lower piles in the rotary press-fit pile, where the upper and lower piles are joined together,
A female joint, a male joint, and a pin;
The female joint is provided with an inner circumferential circular guide hole portion on the distal end side, and a rotational engagement female hole portion adjacent to the proximal end side of the circular guide hole portion,
The rotational engagement female hole portion has a drum-shaped cross section in which an inner periphery is composed of a pair of circular arc surface portions and a pair of flat surface portions,
The pair of circular arc surface portions are continuous with the inner peripheral surface of the circular guide hole portion, and the circular guide hole portion is provided between the circular guide hole portion and the rotation engagement female hole portion in each region of the pair of flat surface portions. A pair of stepped surfaces facing each other, and each pair of flat portions is provided with a groove extending laterally in an in-plane portion thereof, and a pin insertion hole that communicates with the groove and opens to the outer peripheral portion of the female joint Is provided,
The male joint is provided with a rotation engagement male part having an outer peripheral drum-like cross section that fits snugly in the rotation engagement female hole part of the female joint on the distal end side, and is adjacent to the proximal end side of the rotation engagement male part. An outer circular male part that fits into the circular guide hole of the female joint
The circular arc surface portions of the pair of rotationally engaging male portions are continuous with the outer peripheral surface of the outer peripheral circular male portion, and rotate between the rotationally engaging male portion and the outer peripheral circular male portion in each region of the paired flat surface portions. A pair of steps facing the side of the engaging male part is provided, and a groove that extends laterally in the in-plane part of the pair of flat parts and opens the end part is provided,
The male and female joints are fitted with a drum-shaped rotationally engaging male part and a rotationally engaging female hole part, and a circular guide hole part and an outer peripheral circular male part. The problem is solved by the joint structure of the upper and lower piles in the rotary press-fit pile, which is inserted into the groove of the male and female joints through the insertion port.

  In this joint structure, the rotation engagement hole portion of the drum-shaped cross section on the female joint side and the rotation engagement male portion of the drum-shaped cross section on the male joint side are fitted to each other, thereby reversing the forward rotation to the upper pile. Both rotations are reliably transmitted to the lower pile, and in this mating state, the pin is inserted through the pin insertion port of the female joint so as to pass into the groove of the male and female joints, so that the pulling force to the upper pile is reduced. It is reliably transmitted to the lower pile, and by these, it is possible to reliably convey both the normal rotation and the reverse drawing rotation to the upper pile.

  In particular, the rotation engagement hole of the female joint has a drum-like cross section, the rotation engagement male part on the male joint side also has a drum-like cross section, and the pins are inserted along the respective straight portions of the drum-like cross section. Therefore, not only the insertion of the pin is easy, but also the shearing force of the longitudinal section direction acts on each pin instead of the shearing force in the longitudinal section direction, so that the shear strength of the pin is very large, The pulling force to the pile can be reliably transmitted to the lower pile.

  Moreover, in the joint work of the male and female joints, the rotational engagement female hole part of the drum-shaped cross section can be easily fitted to the rotational engagement male part of the drum-shaped cross section, and the joint work of the male and female joints can be easily performed. It can be carried out.

  That is, the female joint is provided with an inner circumferential circular guide hole on the distal end side, and the circular arc surface part of the rotationally engaging male part of the drum-shaped cross section of the male joint is close to the inner circumferential surface part of the circular guide hole. It is made to be inserted. Therefore, in fitting the male and female joints, first, the male and male joints are aligned, and the male engagement joint's drum-shaped cross section is inserted into the circular joint hole of the female joint. The tip is brought into contact with a pair of steps inside the female joint. At the time of this insertion, the female joint guide hole has a circular shape, so there is no need to worry about the position in the rotational direction of the rotational engagement male part of the male joint's drum-shaped cross section, and the insertion can be performed easily. Can do. In addition, since it is only necessary to insert the male joint until the leading end of the male joint comes into contact with the pair of steps inside the female joint, the insertion can be easily performed from this surface.

  Next, the male and female joints are displaced relative to each other. Then, in the process, the rotational engagement male part of the drum-shaped cross section of the male joint and the rotational engagement female hole part of the female joint coincide with each other in the rotational direction, and the rotational engagement male part becomes the rotational engagement female hole. It is inserted into the part, the male and female joints are in a fitted state, and then the pin is inserted to be joined.

  In this way, the process of axial alignment of the male and female joints and the alignment process in the rotational direction can be divided and inserted only by axial alignment, and the rotational alignment is achieved by rotating in the inserted state. Since it can be performed, the fitting operation of the male and female joints can be performed very easily.

  In addition, the male joint is provided with an outer peripheral circular male part on the base end side, and the outer circular male part is fitted into the circular guide hole of the female joint in a joint state of the male and female joints. Therefore, the rigidity of the joint part of the upper and lower piles against bending can be made firm.

  In the fitting state of the male and female joints, the pair of one joint and the other pair of joints may be in contact with each other. In this case, by bringing these steps into contact with each other, the pin insertion groove on the male joint side and the pin insertion groove on the female joint side can be aligned, and groove alignment for pin insertion is possible. Therefore, the pin insertion process in the joint operation can be easily performed. In addition, since the pressure input from the upper pile to the lower pile is performed through the step when the pile is driven, the press-fitting proof stress at the joint portion can be made extremely large.

  When the male and female joints are made of cast products, the joints are of the fitting type, so that each joint can be easily manufactured by casting, and the joints can be manufactured at an advantageous cost.

  Since the present invention is as described above, the upper pile and the lower pile can be easily jointed, and both the positive rotation and the reverse drawing rotation to the upper pile can be reliably performed on the lower pile. In addition, the rigidity of the joint part of the upper and lower piles against bending can be made firm.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  In the joint structure of the embodiment shown in FIGS. 1 to 8, 1 is a female joint, 2 is a male joint, 3 is a pin, each male and male joint 1, 2 is made of a cast product, and the female joint 1 is The upper joint of the lower pile 4 is attached in advance by welding or the like, and the male joint 2 is attached in advance to the lower end of the upper pile 5 by welding or the like. In this embodiment, steel pipe piles are used as the piles 4 and 5, but a shape steel pile or the like may be used.

  As shown in FIGS. 1 to 3, the female joint 1 includes a straight guide hole portion 6 having a circular inner periphery on the distal end side, that is, the upper end side, and is adjacent to the proximal end side, that is, the lower end side of the circular guide hole portion 6. In addition, a straight rotational engagement female hole 7 is provided.

  The rotation engaging female hole portion 7 has a drum-shaped cross section whose inner circumference is composed of a pair of circular arc surface portions 8 and 8 and a pair of flat surface portions 9 and 9, and the pair of circular arc surface portions 8 and 8 are circular guide hole portions. 6 and the inner peripheral surface of the pair of flat portions 9 and 9, the circular guide hole portion 6 faces the circular guide hole portion 6 between the circular guide hole portion 6 and the rotation engaging female hole portion 7. A pair of stages 10, 10 are provided.

  Further, the pair of flat portions 9 and 9 are respectively provided with grooves 11 and 11 extending in the lateral direction in the in-plane portion, and in the extension line direction of the grooves 11 and 11, the female joints communicating with the grooves 11 and 11 are provided. Pin insertion holes 12 that open to the outer peripheral portion of 1 are provided. In this embodiment, the pin insertion holes 12 are provided at both ends of each of the grooves 11, 11. However, one pin may be provided in each groove, and in that case, each pin insertion hole is provided. The holes may open on the same side of the outer periphery of the female joint, or may open on different sides.

  As shown in FIGS. 1, 4 and 5, the male joint 2 is a rotationally engaging male portion 14 having a straight outer drum-like cross section that fits snugly within the rotationally engaging female hole portion 7 of the female joint 1. Is provided on the distal end side, and is provided with a straight outer peripheral circular male portion 15 which is fitted closely to the circular guide hole portion 6 of the female joint 1 adjacent to the proximal end side of the rotating engagement male portion 14.

  The pair of arcuate surface portions 16, 16 of the rotating engagement male portion 14 are continuously connected to the outer peripheral surface of the outer peripheral circular male portion 15, and in each region of the pair of flat surface portions 17, 17, A pair of steps 18, 18 facing the rotary engagement male part 14 is provided between the outer circular male part 15.

  The pair of flat surface portions 17 and 17 are provided with grooves 19 and 19 that extend laterally in the in-plane portions and open the end portions, respectively. In this embodiment, both ends of each groove are opened, but only one end may be opened.

  The male and female joints 1 and 2 are configured such that the drum-shaped rotational engagement male portion 14 and the rotational engagement female hole portion 7, and the circular guide hole portion 6 and the outer peripheral circular male portion 15 are fitted. Therefore, the pins 3 and 3 can be inserted into the grooves 11 and 19 of the male and female joints 1 and 2 through the pin insertion ports 12 and 12 of the female joint 1. In this fitted state, the pair of steps 10 and 10 of the female joint 1 and the pair of steps 18 and 18 of the male joint 2 are brought into contact with each other.

  The joint work of the upper and lower piles 4 and 5 can be performed as shown in FIGS. That is, after driving the lower pile 4 into the ground, first, as shown in FIG. 6 (a), the upper pile 5 is lowered, and the male joint 2 provided at the lower end of the upper pile 5 is rotated and engaged. The male part 14 is inserted into the circular guide hole 6 of the female joint 1 provided at the upper end of the lower pile 4, and the tip of the male joint 2 is inserted into the female joint 1 as shown in FIG. It abuts on the internal steps 10, 10.

  In this insertion operation, the rotation engagement male portion 14 of the male joint 2 has a drum-shaped cross section, but the guide hole portion 6 of the female joint 1 has a circular shape, so that it is not necessary to align in the rotation direction. If only the male and female joints 1 and 2 are aligned, they can be inserted, and the insertion work can be easily performed. In addition, since it is only necessary to insert the tip of the male joint 2 until it contacts the steps 10 and 10 inside the female joint 1, there is no need to worry about the insertion depth.

  Next, as shown in FIG. 6B, the upper pile 5 is rotated. Then, in the rotation process, as shown in FIG. 6C, the positions of the rotation engaging male part 14 of the drum-shaped cross section of the male joint 2 and the rotation engaging female hole part 7 of the female joint 1 in the rotation direction. And the rotationally engaging male part 14 is inserted into the rotationally engaging female hole part 7, and as shown in FIG. 6 (d), the pair of steps 18, 18 on the male joint 2 side is the female joint 1 side. The male and female joints 1 and 2 are brought into a fitted state by being inserted until they are in contact with the pair of steps 10 and 10.

  In this way, the process of axial alignment of the male and female joints 1 and 2 and the alignment process in the rotational direction can be separated and inserted only by axial alignment. Since the alignment can be performed, the fitting operation of the male and female joints 1 and 2 can be performed very easily.

  In this fitted state, as shown in FIGS. 6 (d) and 7 (a), the groove 19 on the male joint 2 side and the groove 11 on the female joint 1 side coincide with each other, and there is a pin from the side. If 3 and 3 are inserted, the male and female joints 1 and 2 are jointed as shown in FIGS. 7B and 7C, whereby the upper and lower piles 4 and 5 are joined.

  The coincidence between the groove 19 on the male joint 2 side and the groove 11 on the female joint 1 side is achieved by contact between the pair of steps 18, 18 of the male joint 2 and the pair of steps 10, 10 of the female joint 1. Therefore, the groove alignment for inserting the pins 3 and 3 can be easily performed, and the process of inserting the pins in the joint work can be easily performed.

  In the above joint structure, as shown in FIG. 8, the rotational engagement female hole portion 7 having a drum-shaped cross section on the female joint 1 side and the rotational engagement male portion 14 having a drum-shaped cross section on the male joint 2 side are fitted. As a result, both forward rotation and reverse rotation to the upper pile 5 are reliably transmitted to the lower pile 4, and in this fitted state, the pins 3 and 3 are connected to the male and female joints 1 and 2. By being inserted into the grooves 11 and 19, the pulling force to the upper pile 5 is reliably transmitted to the lower pile 4. Thereby, both the driving | running | working normal rotation and pull-out reverse rotation to the upper pile 5 can be reliably transmitted to the lower pile 4. FIG.

  In addition, in the present embodiment, when the male and female joints 1 and 2 are fitted, the pair of steps 18 and 18 of the male joint 2 and the pair of steps 10 and 10 of the female joint 1 are brought into contact with each other. In addition, the pressure input from the upper pile 5 to the lower pile 4 is performed through the steps 18, 18, 10, and 10, so that the press-fitting proof strength at the joint portion can be made extremely large, and the driving force is firmly applied to the lower pile 4. I can tell with certainty.

  Further, since the rotation engaging male part 14 of the male joint 2 and the rotation engaging female hole part 7 of the female joint 1 are formed straight, the pins 3 and 3 are rotated by the rotation of the piles 4 and 5. The load in the shear direction is not applied, and the mechanical burden on the pins 3 and 3 can be reduced.

  In addition, in the joint state of the male and female joints 1 and 2, the outer peripheral circular male part 15 on the proximal end side of the male joint 2 is inserted into the circular guide hole 6 of the female joint 1 as shown in FIG. Since it fits well, the rigidity of the joint part of the upper and lower piles 4 and 5 with respect to bending can be made firm.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the case where the upper joint of the lower pile 4 is provided with the female joint 1 and the lower joint of the upper pile 5 is provided with the male joint 2 is illustrated. The male joint 2 may be provided, and the female joint 1 may be provided at the lower end portion of the upper pile 5. Further, in the above embodiment, the pressure input applied to the upper pile 5 is transmitted to the lower pile 4 through the steps 18, 18, 10, 10, but the pressure input is applied to the lower pile 4 through the pins 3, 3. It may be transmitted, or may be transmitted to the lower pile 4 through other parts.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment in which a male and female joint and a pin are separated. FIGS. 1A and 1B are perspective views of a female joint. FIG. 2A is a front view of a left front right cross section, FIG. 2B is a front end view, FIG. 2C is a base end view, and FIG. FIGS. 1A and 1B are perspective views of a male joint, respectively. The male joint is shown, in which FIG. (A) is a front view, FIG. (B) is a proximal end view, FIG. (C) is a distal end view, and FIG. (D) is a side view. FIGS. 1A to 1D are cross-sectional side views sequentially showing the joint method of the male and female joints together with FIG. FIGS. 6 (a) to 6 (d) show a joint method for male and female joints. FIGS. 6 (a) and 6 (b) are sectional plan views and FIG. 6 (c) are sectional side views. Fig. (A-2) is a cross-sectional front view at the time of driving forward rotation, Fig. (I-1) is a cross-sectional view taken along the line II of Fig. (I-2), and Fig. (B-2) is a cross-section at the time of reverse rotation of drawing. Front view, FIG. (B-1) is a sectional view taken along line II-II in FIG. (B-2).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Female joint 2 ... Male joint 3 ... Pin 4 ... Lower pile 5 ... Upper pile 6 ... Circular guide hole part 7 ... Rotary engagement female hole part of a drum-shaped cross section 8 ... Arc surface part 9 ... Plane part 10 ... Step 11 ... Groove 14 ... Drum 15 rotational engagement male part 15 ... Circular circular male part 16 ... Arc surface part 17 ... Plane part 18 ... Step 19 ... Groove

Claims (3)

One of the female and male joints is provided at the upper end of the lower pile, and the other joint is provided at the lower end of the upper pile. By joining these male and female joints, the upper and lower piles are joined together. The joint structure of the upper and lower piles in the rotary press-fit pile,
A female joint, a male joint, and a pin;
The female joint is provided with an inner circumferential circular guide hole portion on the distal end side, and a rotational engagement female hole portion adjacent to the proximal end side of the circular guide hole portion,
The rotational engagement female hole portion has a drum-shaped cross section in which an inner periphery is composed of a pair of circular arc surface portions and a pair of flat surface portions,
The pair of circular arc surface portions are continuous with the inner peripheral surface of the circular guide hole portion, and the circular guide hole portion is provided between the circular guide hole portion and the rotation engagement female hole portion in each region of the pair of flat surface portions. A pair of stepped surfaces facing each other, and each of the plane portions of the pair is provided with a groove extending laterally in an in-plane portion thereof, and a pin insertion hole communicating with the groove and opening to the outer peripheral portion of the female joint Is provided,
The male joint is provided with a rotation engagement male part having an outer peripheral drum-like cross section that fits snugly in the rotation engagement female hole part of the female joint on the distal end side, and is adjacent to the proximal end side of the rotation engagement male part. An outer circular male part that fits into the circular guide hole of the female joint
The circular arc surface portions of the pair of rotationally engaging male portions are continuous with the outer peripheral surface of the outer peripheral circular male portion, and rotate between the rotationally engaging male portion and the outer peripheral circular male portion in each region of the paired flat surface portions. A pair of steps facing the side of the engaging male part is provided, and a groove that extends laterally in the in-plane part of the pair of flat parts and opens the end part is provided,
The male and female joints are fitted with a drum-shaped rotationally engaging male part and a rotationally engaging female hole part, and a circular guide hole part and an outer peripheral circular male part. A joint structure for upper and lower piles in a rotary press-fit pile, wherein the joint is inserted through a slot into a groove of both male and female joints.   The joint structure of the upper and lower piles in the rotary press-fitting pile according to claim 1, wherein the step of the pair of one joint and the step of the pair of the other joint are brought into contact with each other in the fitting state of the male and female joints. .   The joint structure of the upper and lower piles in the rotary press-fit pile according to claim 1 or 2, wherein the male and female joints are each made of a cast product.

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