JP2000282459A - Pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely connect piles together in a locked condition, without requiring great labor in connecting operations so that operational costs can be reduced. SOLUTION: A cylinder portion 21 is provided at one pile end and a shaft portion 11 is provided at the other pile end. A circumferentially extending inward groove 22 is formed on the inner peripheral surface of the cylinder portion 21 and a circumferentially extending outward groove 12 is formed on the outer peripheral surface of the shaft portion 11 opposite to the inward groove 22. A ring-shaped member having formed therein a plurality of elastic portions that are easy to deform elastically is fitted into the outward groove 12 or the inward groove 22 across the inward groove 22 and the outward groove 12 as the cylinder portion 21 is fitted over the shaft portion 11, and the cylinder portion 21 and the shaft portion 11 of adjacent piles fitted one over the other are freely connected together in a locked condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pipe provided at one end of a pile and a shaft at the end of the other pile, and the pipe and the shaft of a pile adjacent to each other in the pile axis direction. The present invention relates to a connection structure for piles, which are configured to be connectable to each other in a state where they can be prevented from coming off from each other.

[0002]

2. Description of the Related Art The connection structure of a pile is provided with a cylinder and a shaft at an end of the pile so that the pile can be buried in the ground at a desired length. The shaft portion and the shaft portion can be connected to each other in a retaining state. Conventionally, a cylindrical portion having an inner peripheral surface of a cylindrical portion having a female screw portion, and a shaft portion having a male screw portion. A shaft portion having an outer peripheral surface is provided, and the cylindrical portion and the shaft portion are screw-fitted with each other so that adjacent piles can be connected to each other in a state where they cannot be removed.

[0003]

According to the above conventional connection structure of piles, it is necessary to gradually move the piles close to each other while rotating them relative to each other to screw the cylinder part and the shaft part together. When the pile itself is large and heavy, the connection between the male and female threads is likely to occur during screwing. There is a drawback that the work cost is likely to increase because the work is more troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made to reduce the work cost without a great deal of labor for connection work, and to make it possible to securely connect piles in a locked state. The purpose is to do.

[0005]

According to a feature of the present invention, a cylindrical portion is provided at one pile end, and a shaft portion is provided at the other pile end, and the piles are adjacent to each other in the core axis direction of the pile. A pile configured so that the cylindrical portion and the shaft portion of the pile can be connected to each other in a detachable state, and an inward groove along a circumferential direction is formed on a cylindrical portion inner peripheral surface portion of the cylindrical portion, An outward groove along the circumferential direction is formed on the outer peripheral surface of the shaft of the shaft so as to face the inward groove of the inner peripheral surface of the cylindrical portion fitted to the outer peripheral surface of the shaft. Ring-shaped member,
Along with being formed to be able to be accommodated in a state of being retreated to the back from the entrance of the outward groove or the inward groove, a plurality of elastic portions which are easily elastically deformed in the circumferential direction of the ring-shaped member are formed, and the ring-shaped member is The pipe is diametrically deformed and fitted over the inward groove and the outward groove so that the cylindrical part and the shaft part of the adjacent piles fitted to each other are configured to be freely connected in a state where they cannot be removed. It is in.

A characteristic feature of the invention according to claim 2 is that the elastic portion is formed by a notch leaving a thin portion provided in a circumferential direction of the ring-shaped member.

A feature of the invention according to claim 3 is that the elastic portion is formed by interposing an elastic member which is more easily deformed than other portions provided in the circumferential direction of the ring-shaped member.

According to the first aspect of the present invention, an inward groove is formed in the inner peripheral surface of the cylindrical portion along the circumferential direction, and the outer peripheral surface of the shaft of the shaft is formed. An outward groove along the circumferential direction is formed so as to face the inward groove on the inner peripheral surface of the cylindrical portion fitted to the outer peripheral surface of the shaft. The groove or the inward groove is formed so as to be accommodated in a state of being retracted to the back from the entrance, and a plurality of elastic portions that are easily elastically deformed are formed in the circumferential direction of the ring-shaped member, and the ring-shaped member is radially deformed. The inward groove portion and the outward groove portion are fitted so as to straddle each other, so that the tubular portion and the shaft portion of the adjacent piles fitted to each other are configured to be freely connected in a retaining state, so that a ring shape is formed. While ensuring a large thickness and width of the member Setteingu work to accommodate outwardly groove or inward in the groove is facilitated. In other words, in the conventional configuration in which the cylindrical portion 21 and the shaft portion 11 are screw-fitted to each other, connection work is troublesome and the operation cost is likely to be high. Therefore, the ring-shaped member 38 as shown in FIG. An inward groove 22 along the circumferential direction on the inner circumferential surface 5 of the cylindrical portion 21
And the shaft portion 11 is fitted over the shaft portion outer peripheral surface portion 6 so as to straddle the outwardly extending groove portion 12 along the circumferential direction, and the tubular portion 21 and the shaft portion 11 of the adjacent piles fitted to each other are prevented from falling out. Although it is conceivable to connect and connect in a state, it is necessary to secure a large thickness and width of the ring-shaped member 38 in order to resist the shearing force by the cylindrical portion 21 and the shaft portion 11, and if so, the ring-shaped member 38 The member 38 is not easily deformed, and the ring-shaped member 38 is deformed into the outward groove 12 or the inward groove 22 by changing the diameter of the ring-shaped member 38 before connecting and connecting the cylindrical portion 21 and the shaft portion 11. The setting work for accommodating becomes difficult. Conversely, if the thickness and width of the ring-shaped member 38 are reduced to facilitate deformation,
Although there is a problem that it becomes impossible to resist the shearing force, in this case, since a plurality of elastic portions that are easily elastically deformed are formed in the circumferential direction of the ring-shaped member, a large thickness and width of the ring-shaped member are secured. Thus, the shear force can be counteracted, and the ring-shaped member can be easily deformed at the time of setting work. As a result, it is possible to provide a ring-shaped member that can withstand the shearing force and is easily elastically deformed.

According to the characteristic configuration of the second aspect of the present invention, in addition to the function and effect of the first aspect of the present invention, the thin portion in which the elastic portion is provided in the circumferential direction of the ring-shaped member is provided. The ring-shaped member can be easily elastically deformed. In other words, when trying to expand or reduce the diameter of the ring-shaped member,
The thin portion functions as an elastic portion, and the gap between the notches allows the opposing notch end faces in the notch to move apart or approach each other. As a result, the radial deformation of the ring-shaped member is easily and smoothly performed.

According to the characteristic configuration of the third aspect of the present invention, in addition to the effects of the first aspect of the invention, the other portion in which the elastic portion is provided in the circumferential direction of the ring-shaped member is provided. Since the ring-shaped member is formed by interposing an elastic member that is more easily deformed, the ring-shaped member can be easily elastically deformed. That is, when trying to expand or reduce the diameter of the ring-shaped member, the diameter of the ring-shaped member can be changed by elastically deforming the elastic member. As a result, the ring-shaped member can be easily deformed in diameter.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a case in which a cylindrical cylindrical portion 21 is provided at one pile end and a small-diameter cylindrical shaft 11 is provided at the other pile end, and a cylindrical portion 2 of a pile A adjacent in the pile axis direction.
1 shows a landslide-preventing stake A, which is configured so as to be freely connectable to each other in a state where the stakes 1 and the shaft portion 11 are prevented from coming off from each other. It is inserted into a vertical hole excavated in the ground in advance, and the hollow portion E and the outer periphery of the pile are filled with a filler such as concrete to reinforce the ground.

(1) As shown in FIG. 1 (a), a pile A according to the present invention has a cylindrical cast steel pipe 1 cast by a centrifugal casting method and a first end provided with a cylindrical portion 21 at one end. While the cast steel pipe box joint 5 is welded and connected, the second end of the cast steel pipe 1 is welded and connected to the second cast steel pipe box joint 6 having the shaft portion 11 so that the outer diameter is substantially constant over the entire length. The second jointed steel pipe box joint 6 is configured to be buried underground facing upward, and an annular outward groove 12 is provided on the shaft outer peripheral surface of the shaft 11. Together with the cylindrical part 2
An operation of providing an annular inward groove 22 in the inner peripheral surface portion of the first cylindrical portion, and providing a through hole 4 in the inward groove 22 to communicate with the inside and outside of the cylindrical portion 21 to change the diameter of the ring-shaped member 3. A portion S is formed. The steel constituting the first and second box joints 5, 6 is a cast steel pipe 1
It has a higher strength than the steel that forms A C-ring 3 made of a spring material having an inner diameter smaller than the diameter of the entrance 12a of the outward groove portion 12 in its natural state and having an outer diameter larger than the diameter of the entrance 22a of the inward groove portion 22 in a natural state.
1 (an example of a ring-shaped member 3) and its C-ring 31
Opening 3a of the C-ring 31
A spacer 51 made of a thermoplastic resin having a size that pushes the inner diameter of the C-ring 31 larger than the diameter of the entrance of the inward groove 22 when it is fitted to 1a is prepared.
The depth of the inward groove 22 is larger than the width of the C ring 31 and the outward groove 1
The depth of 2 is smaller than the width of the C-ring 31. The “width” of the ring-shaped member 3 (the C-ring 31 in this embodiment) referred to in the present invention is the length in the radial direction when the ring-shaped member 3 is cut in the radial direction, and the “thickness” "
Indicates the axial length of the ring-shaped member 3. The “width” of each of the grooves 12 and 22 is a distance between the entrances 12a and 22a of the piles 1 and 2 as viewed in the axial direction,
The “depth” refers to the distance in which the piles 1 and 2 retreat in the radial direction. (2) The C-ring 31 is inserted into the inward groove 22 and the spacer 51 is fitted into the opening 31a of the C-ring 31, thereby expanding the C-ring 31 to a large diameter state. With the inward groove 22
From the entrance.
At this time, the spacer 51 is arranged at a position facing the through hole 4. (3) The shaft portion 11 is fitted into the cylindrical portion 21, and the inward groove portion 22 and the outward groove portion 12 are arranged so as to face each other. (See FIGS. 1 (b) and 2 (a).) (4) By heating and melting the spacer 51 from the through hole 4 and reducing the diameter of the C ring 31,
The C ring 31 is fitted so as to straddle the outward groove 12 and the inward groove 22, and both are held in an engaged state. (5) The space between the inward groove 22 and the C ring 31 is filled with a curable filler a, and the C ring 31
To prevent rattling (FIG. 1 (c), FIG. 2).
(B)). Thereby, the first pile 1 and the second pile 2
Is in a state of being connected to each other via the C-ring 31 in an engaged state.

The C-ring 31 is, as shown in FIG.
A plurality of notches K leaving a thin portion D1 formed on the inner side in the circumferential direction of the metal ring-shaped member are formed so as to be radially deformable. Then, when the C-ring 31 is expanded and deformed to a large diameter state so as to be accommodated deeply from the entrance of the inward groove portion 22, the thin portion D1 functions as an elastic portion D, and the notch K Since the gap S allows the opposing notch end faces t in the notch K to move apart or approach each other, the C-ring is expanded and deformed to place the spacer 51 in the opening 31a of the C-ring. The work of fitting and inserting into the inward groove 22 becomes easy.

[Another Embodiment] Another embodiment will be described below. <1> In order to hold the outward groove and the inward groove in the engaged state, the present invention is not limited to the method in which the diameter of the C ring described in the previous embodiment is reduced from the expanded state. C which has been reduced in diameter and accommodated in the outward groove.
The ring may be expanded in diameter so that both are held in an engaged state. <2> The elastic portion D is not limited to the plurality of cutout portions K provided on the inner side in the circumferential direction described in the above embodiment. For example, as shown in FIG. The elastic portion D may be formed by a plurality of cutout portions K leaving the provided thin portion D1. <3> The direction and the shape of the cutout K are not limited to the radially arranged U-shaped cutouts described in the above embodiment, and the direction is arbitrary. In other words, the direction and the shape are arbitrary as long as the thickness and width of the ring-shaped member can be secured large, but the setting operation for accommodating the ring-shaped member in the outward groove or the inward groove is easy. <4> The elastic portion D may be formed by interposing an elastic member d that is more easily deformed than other portions at a plurality of positions in the C ring 33. For example, as shown in FIG.
When the C-ring 33 is expanded and deformed to a large diameter state in order to accommodate the C-ring 33 deeply from the entrance 22a of the inward groove 22 when the C-ring 33 is formed by interposing (an example of an elastic member), Since the rubber material d provided at the location functions as the elastic portion D, insertion into the inward groove portion 22 is easy. The width of the elastic portion D may be provided up to the full width of the C ring 33, or a thin portion may be formed either inside or outside the width of the C ring 33. <5> As the ring-shaped member 3, as shown in FIG. 6, a plurality of split keys 35 may be fixedly mounted on a leaf spring 34 at intervals. In this case, as described in the previous embodiment, the leaf spring 34 functions as the elastic portion D, and the interval between the divided keys 35 functions as a permissible portion when the ring-shaped member 3 is radially deformed. <6> The structure for holding the expanded state of the C-ring is not limited to the thermoplastic resin spacer described in the above embodiment. For example, the diameter is expanded by interposing a bolt, a spacer, or the like at the opening of the C-ring. The state may be maintained, and the diameter may be reduced by eliminating the intervention of the bolt or the spacer. In short, any structure can be used as long as it can maintain the expanded diameter state of the C-ring and can show the reduced diameter state. Also, the structure for expanding the diameter of the C-ring in the reduced diameter state
It may be performed by interposing a bolt, a spacer, or the like in the C ring opening. In short, any structure can be used as long as it can maintain the reduced diameter state of the C-ring and can show the expanded diameter state. <7> The number of elastic portions is not limited to seven as described in the above embodiment, and the number is arbitrary. In short, it suffices if the diameter can be deformed so as to be accommodated in the groove. <8> The number of the inward groove portions and the outward groove portions is not limited to the two described in the above embodiment, and it is sufficient if both are one or more, and the numbers are arbitrary. <9> The inner peripheral surface of the cylindrical portion and the outer peripheral surface of the shaft portion are not limited to the one-stage fitting described in the above embodiment, but may be any number as long as it is one stage or more. Further, the fitting may be in a stepwise manner or may be in a tapered surface. Note that, in the claims, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a process diagram showing a method for connecting piles according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a state of a ring-shaped member in a pile connection structure according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a ring-shaped member according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a ring-shaped member of another embodiment.

FIG. 5 is a perspective view showing a ring-shaped member of another embodiment.

FIG. 6 is a perspective view showing a ring-shaped member of another embodiment.

FIG. 7 is a perspective view showing a ring-shaped member of a comparative example.

[Explanation of symbols]

 Reference Signs List 3 ring-shaped member 5 cylinder inner peripheral surface 6 shaft outer peripheral surface 11 shaft 12 outward groove 21 cylinder 22 inward groove 22a entrance D elastic part D1 thin part K cutout d elastic member

Claims (3)

[Claims] 1. A cylindrical part (21) is provided at one pile end and a shaft part (11) is provided at the other pile end, and said cylindrical part (21) of piles adjacent to each other in the pile axis direction. And the shaft (11)
And a stake that is configured to be freely connected to each other in a state in which they can be prevented from coming off. An inward groove (22) extending in the circumferential direction is formed on the inner peripheral surface (5) of the cylindrical portion of the cylindrical portion (21). An outwardly extending groove (12) extending in the circumferential direction is fitted to the shaft outer peripheral surface (6) of the shaft (11), and the cylindrical inner peripheral surface (5) fitted to the shaft outer peripheral surface (6). Inward groove (22)
The ring-shaped member (3), which is formed so as to be opposed to and can be radially deformed, can be accommodated in a state of being retracted to the back from the entrance (22a) of the outward groove (12) or the inward groove (22). The ring-shaped member (3) is formed with a plurality of elastic portions (D) that are easily elastically deformed in the circumferential direction of the ring-shaped member (3), and the ring-shaped member (3) is radially deformed to form the inward groove portion (22). The tubular portions (2) of adjacent piles fitted to each other and fitted over the outward groove (12).
1) A pile configured to be freely connected to the shaft portion (22) in a state where the shaft portion (22) is prevented from falling off. 2. The pile according to claim 1, wherein said elastic portion (D) is formed by a notch (K) leaving a thin portion (D1) provided in a circumferential direction of said ring-shaped member (3). . 3. The elastic member (D) is formed by interposing an elastic member (d) which is more easily deformed than other parts provided in the circumferential direction of the ring-shaped member (3). The mentioned stake.