JP4511015B2 - Joint structure of upper and lower piles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure for upper and lower piles.
[0002]
[Prior art]
As a method of pile driving using a steel pipe pile or the like, after driving the lower pile, there is a method in which the lower end of the upper pile is jointed to the upper end of the lower pile and driven forward. In this case, the joints of the upper and lower piles are conventionally made by welding the upper and lower piles all around the site, or they can be screwed to the upper end of the lower pile and the lower end of the upper pile, respectively. It has been performed that screws are provided and screws are screwed together by rotating the upper pile.
[0003]
[Problems to be solved by the invention]
However, on-site welding requires time and effort, and the quality of the joint is difficult to stabilize. Further, an ultrasonic flaw detection test is required, and in addition, it is difficult to bring out the vertical of the pile.
[0004]
In addition, when screws are screwed together, it is troublesome because the upper pile must be rotated in order to screw them together, and since the screws are precision parts in the first place, there is a risk that they cannot be joined by sand bites or the like. In addition, it may be necessary to rotate the pile in reverse as well as forward rotation during pile driving, so it is necessary to provide a means to prevent the screw from returning, considering the case of reverse rotation There is.
[0005]
In view of the conventional problems as described above, the present invention can rotate the upper and lower piles integrally even if the upper and lower piles are easily and reliably rotated on-site without being welded and reversely rotated during pile driving. It is an object to provide a joint structure for upper and lower piles.
[0006]
[Means for Solving the Problems]
The above-mentioned problem is provided with a horizontal flange plate projecting laterally at the lower end portion of the upper pile, and a horizontal flange plate projecting laterally at the upper end portion of the lower pile. It is solved by the joint structure of the upper and lower piles characterized in that the upper and lower piles are joined by bolting.
[0007]
In this structure, since the upper and lower piles are joined by bolting the flange plates to each other, the upper and lower piles can be joined easily with good quality and without welding on site. Moreover, it is easy to clean the contact surfaces between the flange plates, and it is possible to easily prevent the sand and the like from being caught, and there is no possibility of causing joint failure. In addition, the bolt works to prevent relative rotation between the flange plates even when the piles must be rotated in reverse during pile driving, or even if the flange plate contact surface is flat. Can be rotated integrally in either the forward or reverse direction. Furthermore, the flange plate which connects the upper and lower piles plays the role of the peg of the peg pile, and the support capacity of the pile becomes high.
[0008]
In the above joint structure, each flange plate is formed of a circular flange plate, and a part of the circumferential direction thereof is cut out to form inclined blades that allow the lower soil to escape upward during pile driving. In the pile, the notch is provided at the same position in the circumferential direction, and the inclined blade of the flange plate at the lower end of the upper pile is inclined obliquely upward toward the tip of the blade, and the inclined blade of the flange plate at the upper end of the lower pile Is inclined obliquely downward toward the blade tip, and the upper and lower piles are preferably joined by joining the flange plates with bolts at portions other than the notch.
[0009]
In this case, during pile driving by rotary press-fitting method etc., the inclined blades of the flange plate excavate the ground, and the bottom soil can escape through the notch, and the excavation can be made high, Both horizontal flange plates can consolidate the soil below it and consolidate the soil under the flange plate, making the bearing capacity of the pile very high, yet Can be jointed.
[0010]
When irregularities are formed on the contact surfaces of the flange plates, and the relative rotation between the flange plates is restricted by the engagement of the irregularities, the engagement of the irregularities is reduced while reducing or eliminating the burden on the bolts. The upper and lower piles can be rotated integrally in either the forward or reverse direction.
[0011]
Moreover, when the flange board projected to the side is provided in the height direction intermediate part of the upper pile and / or the lower pile, the support force of a pile can be made still higher.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0013]
In the pile shown in FIG. 1, 1 is an upper pile and 2 is a lower pile, both of which are circular steel pipe piles. And the horizontal circular flange plates 3 and 4 which are each projected to the side of a pile are provided in the lower end part of the upper pile 1, and the upper end part of the lower pile 2, respectively. The flange plates 3 and 4 are respectively attached to the short cylindrical stiffeners 5 and 5 by welding W, and the stiffeners 5 and 5 are welded to the ends of the piles 1 and 2 while being externally fitted. It is attached to the pile end. The attachment of the flange plates 3 and 4 and the stiffeners 5 and 5 may not be performed when the upper and lower piles 1 and 2 are joined, and may be performed in advance at a factory, for example. In addition, the flange plates 3 and 4 may consist of a disc, and may consist of an annular plate.
[0014]
The flange plates 3 and 4 are respectively provided with bolt through holes 6 at intervals in the circumferential direction, and a notch 7 is formed at a part in the circumferential direction, in this embodiment, at one place in the circumferential direction. An inclined blade 8 is provided for releasing soil below the flange plate when pile driving. The inclined blades 8 of the flange plate 3 at the lower end of the upper pile 1 are inclined obliquely upward toward the blade tip, and the inclined blades 8 of the flange plate 4 at the upper end of the lower pile 2 are inclined obliquely downward toward the blade tip. The upper and lower piles 1 and 2 are joined by joining the flange plates 3 and 4 with bolts at portions other than the notches 7 and 7.
[0015]
Moreover, in this embodiment, as shown in FIG. 2, the outer peripheral portion of the lower end portion of the pile 9 positioned at the bottom is provided with a single circular flange plate 10 projecting to the side of the pile 9, A notch portion 7 is formed in a part of the flange plate 10 in the circumferential direction, and inclined blades 8 and 8 are formed in the notch portion 7 for releasing the soil below when pile driving. Further, the tip of the lowermost pile 9 is closed with a lid 11 attached inside, and an excavation blade 12 is provided so as to protrude from the lid 11 to the outside of the pile 9.
[0016]
The upper and lower piles 1, 2 are driven into the flange plate 4 provided at the upper end of the lower pile 2 after the lower pile 2 is driven by rotary press-fitting or the like, and the flange plate 3 provided at the lower end of the upper pile 1. Are joined so that the notches 7 and 7 coincide with each other vertically, and the flange plates 3 and 4 are joined with bolts. In this case, in order to maintain the efficiency of the joint for a long period of time, it is preferable to use a rust prevention bolt. Or you may make it take the sacrificial anti-corrosion method by electric corrosion in order to prevent the corrosion of a volt | bolt. Alternatively, a rust prevention treatment may be applied after the bolt is tightened. After the joints are piled, the piles will be further advanced by restarting rotary press-fitting.
[0017]
In the above joint structure, since the upper and lower piles 1 and 2 are joined by bolting the flange plates 3 and 4 together, the joints can be easily and satisfactorily joined with good quality without on-site welding. In addition, it is easy to clean the contact surfaces of the flange plates 3 and 4, and it is possible to easily prevent the sand and the like from being caught, and there is no possibility of causing joint failure. In addition, the bolt works to prevent relative rotation between the flange plates 3 and 4 even when the pile must be rotated in reverse during pile driving, even if the flange contact surface is flat. The piles 1 and 2 can be integrally rotated in both forward and reverse directions. Furthermore, the flange plates 3 and 4 which connect the upper and lower piles 1 and 2 can play the role of the peg of the peg pile, and the support force of the pile can be increased.
[0018]
Moreover, in this embodiment, each flange board 3 and 4 consists of circular flange boards, and the notch parts 7 and 7 are provided in a part of the circumferential direction, and the slope which escapes the lower soil up in the case of pile driving Since the blades 8 and 8 are provided, during the pile driving, the inclined blades 8 and 8 of the flange plates 3 and 4 excavate the ground, and through the notches 7 and 7, the lower soil is released upward and excavation performance is improved. Can be expensive. Moreover, the horizontal flange plates 3 and 4 can consolidate the soil below the flange plate so as to consolidate the soil under the flange plate, so that the bearing capacity of the pile can be very high, yet The upper and lower piles 1 and 2 can be jointed. Moreover, the pulling resistance of the pile can be increased.
[0019]
In particular, in this embodiment, it consists of a bottomed steel pipe pile having a bottomed flange plate 10 provided with a notch 7 and inclined blades 8 and 8 at the lower end of the bottom pile 9, and in this bottomed steel pipe pile, Since the upper and lower piles 1 and 2 are joined by bolting the flange plates 3 and 4 with the notched portions 7 and 7 and the inclined blades 8 and 8, the excavation burden on the bottom expanded flange plate 10 at the tip of the pile Can be lightened by the action of the flange plates 3 and 4 of the joint portions of the upper and lower piles 1 and 2.
[0020]
In the embodiment shown in FIG. 3 (a), a cross-shaped convex 16 is formed on one of the opposing surfaces of the upper and lower flange plates 3 and 4 to be bolted, and the cross-shaped convex 16 is fitted on the other. A concave 17 is formed, and a joint structure is formed in which the upper and lower flange plates 3 and 4 are bolted by fitting the cruciform irregularities 16 and 17 together. Further, in the embodiment shown in FIG. 3 (b), a plurality of linear protrusions 15 parallel to one of the opposing surfaces of the upper and lower flange plates 3 and 4 to be bolted are formed so as to cross, and the other is Linear grooves 16 are formed to fit the linear protrusions 15. The joint structure is configured such that the upper and lower flange plates 3 and 4 are bolted by fitting the protrusions 15 and the grooves 16. . In any joint structure, the upper and lower piles 1 and 2 can be integrally rotated in either direction by the engaging action of the irregularities 15 and 16, and the mechanical burden on the bolt during the pile rotation is reduced or eliminated. Can do.
[0021]
The pile shown in FIG. 4 has a flange plate 17 attached to the side of the pile in the middle part in the length direction of the upper and lower piles 1 and 2. By carrying out like this, the supporting force of a pile can be made still higher. The flange plate 17 may be attached only to the lower pile 2 or may be attached only to the upper pile 1.
[0022]
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, although the case where it applied to a circular steel pipe pile is shown in said embodiment, this invention may be used for a square steel pipe pile and can be used for various piles. In addition, the terms “upper pile” and “lower pile” in the present invention are relative, and when three or more piles are jointed, the upper pile of any two adjacent piles is the upper pile. Thus, the lower pile becomes the lower pile, and it goes without saying that the same pile can be either an upper pile or a lower pile depending on how it is viewed.
[0023]
【The invention's effect】
Since the present invention is as described above, the upper and lower piles can be rotated integrally even if the upper and lower piles are rotated easily and reliably without on-site welding and reversely rotated during pile driving.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows a joint structure of an embodiment, in which FIG. (A) is a side view in which upper and lower piles are separated, FIG. (B) is a side view of joints, and FIG. It is an II sectional view taken on the line.
FIG. 2 (a) is a side view of a jointed pile, and FIG. 2 (b) is a side view of the tip of the bottom pile.
FIGS. 3A and 3B are separated perspective views showing other embodiments of the joint portion, respectively.
FIG. 4 is a side view of a jointed pile according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Upper pile 2 ... Lower pile 3 ... Flange board 4 ... Flange board 6 ... Bolt hole 7 ... Notch part 8 ... Inclined blade | wing 15 ... Convex 16 ... Concave 17 ... Flange board

Claims (3)

With a horizontal circular flange plate projecting laterally is provided in the lower end of the upper pile, provided with a horizontal circular flange plate overhanging also laterally to the upper end of the lower pile,
Each flange plate is made of those inclined blade to release the soil below the top when the circumferential direction of the partially cut away in there staked is formed, cut-outs circumferential upper and lower pile provided in the same position in the direction and tilt wing flange plate of the upper pile bottom end is inclined obliquely upward toward the blade tip, diagonally downward inclined blades of the flange plate of the lower pile upper end toward the blade distal end The joint structure of the upper and lower piles characterized in that the upper and lower piles are joined by joining the flange plates with bolts at portions other than the notches. Are irregularities formed on the abutment surface of the flange plates are, joint structures of the upper and lower piles of claim 1 that is adapted to the relative rotation of the flange plates are in engagement of the irregularities is restricted. The joint structure of the upper and lower piles of Claim 1 or 2 with which the flange board projected to the side is provided in the height direction intermediate part of the upper pile and / or the lower pile.

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