JP7085893B2 - Steel pipe connection mechanism - Google Patents

Description

The present invention has a tubular joint provided at one of the steel pipe ends adjacent to each other in the direction of the steel pipe axis and a shaft shape provided at the other steel pipe end and can be fitted to the tubular joint. A state in which the joint, the storage position stored in the inward groove provided on the inner peripheral surface of the tubular joint along the circumferential direction, and the tubular joint and the shaft joint are fitted to each other. Occasionally, the position can be changed between an outward groove portion provided along the circumferential direction on the outer peripheral surface of the shaft-shaped joint so as to face the inward groove portion and a straddling position straddling the inward groove portion. With respect to a steel pipe connecting mechanism having a load transfer key.

As an example of a steel pipe connecting mechanism for connecting steel pipes to each other in the direction of the steel pipe axis, Patent Document 1 describes one of both connecting portions B provided at both ends of columnar bodies A1 and A2 (corresponding to the steel pipe of the present invention). Is formed on the tubular portion 1 (corresponding to the tubular joint of the present invention), and the other is formed on the shaft portion 2 (corresponding to the tubular joint of the present invention) that can be fitted into the tubular portion 1. An inward groove portion 6 is formed on the inner peripheral surface 4 of the cylinder portion 1, and an outward groove portion 12 is fitted on the outer peripheral surface surface 10 of the shaft portion of the shaft portion 2 and the inner peripheral circumference of the cylinder portion is fitted to the outer peripheral surface surface 10 of the shaft portion. A cylinder of adjacent columnar bodies A1 and A2 formed so as to face the inward groove 6 on the surface 4 and fitted so as to straddle the inward groove 6 and the outward groove 12 facing each other. A connection mechanism S provided with an arc key 18 (corresponding to the load transmission key of the present invention) for connecting the portion 1 and the shaft portion 2 in a retaining state is disclosed. Each reference numeral is in Patent Document 1.

In this connection mechanism S, the arc key 18 rotates the set bolt 17 in one direction from the storage position stored in the inward groove portion 6 to the inward groove portion 6 and the outward groove portion 12 of the fitting portion 9. It is configured to be moved to the straddling position and moved from the straddling position to the storage position by rotating the set bolt 17 in the other direction.

However, it was necessary to machine a hole and a female screw for screwing the set bolt 17 into the arc key 18. Further, the presence of the hole portion may weaken the strength of the arc key 18.

Japanese Unexamined Patent Publication No. 2000-31987

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a steel pipe connecting mechanism capable of moving a load transmission key between a straddle position and a storage position by a simple structure. ..

In order to achieve the above object, the characteristic configuration of the steel pipe connecting mechanism of the present invention is a tubular joint provided at one of the steel pipe ends facing each other of the steel pipes adjacent to each other in the direction of the steel pipe axis, and the other steel pipe end. A shaft-shaped joint provided in the portion and fitted to the tubular joint, a storage position stored in an inward groove portion provided along the circumferential direction on the inner peripheral surface of the tubular joint, and the tubular shape. When the joint and the shaft-shaped joint are fitted to each other, the outward groove portion and the inward-facing groove portion provided along the circumferential direction on the outer peripheral surface of the shaft-shaped joint so as to face the inward groove portion. It is a steel pipe connecting mechanism having a straddling position straddling the groove portion and a load transmission key arranged so that the position can be changed, and the outer peripheral surface of the tubular joint and the inward groove portion are communicated with each other. A through hole provided with a female screw on the inner peripheral surface and an operating member provided on the outer peripheral surface with a male screw screwable to the female screw of the through hole are provided, and the load is applied to the operating member. A suction portion capable of sucking the transmission key is provided , the operating member is provided with an engaging portion, and the load transmission key is provided with an engaged portion with which the engaging portion can be engaged . ..

According to the above configuration, when the steel pipes are connected to each other, the operation member screwed into the through hole of the tubular joint is screwed inward in the radial direction of the steel pipe, so that the load transmission key is laid across from the retracted position. It can be moved to and fixed at that position.

When the steel pipes are split, the load transmission key straddles the operating member screwed into the through hole of the tubular joint by screwing it outward in the radial direction and being attracted to the suction part of the operating member. It can be moved from the installation position to the storage position and can be held as it is at that position.

Therefore, unlike the conventional case, it is not necessary to process the hole and the female screw in the load transmission key. Therefore, there is no possibility that the strength of the load transmission key will be weakened due to the presence of the hole. A permanent magnet or an electromagnet can be exemplified as the suction portion. Further, the suction portion may be formed of a separate body from the operating member, or may be the operating member itself. Further, according to the above configuration, the engaging portion provided on the operating member side engages with the engaged portion provided on the load transmitting key side, so that the load transmitting key is placed in the circumferential direction at the straddling position. Is blocked from moving.

In the present invention, it is preferable that the suction portion is made of a hard magnetic material, and at least a part of the load transmission key is made of a soft magnetic material that the suction part can suck.

According to the above configuration, the portion composed of the soft magnetic material of the load transmission key is attracted by the magnetic force of the hard magnetic material constituting the suction portion. As the hard magnetic material, a permanent magnet composed of neodymium, alnico, ferrite or the like, which is relatively excellent in mechanical strength and adsorptive power is preferably adopted. Examples of the soft magnetic material include those containing iron or an iron group transition metal, and the load transmission key is preferably composed of only the soft magnetic material. If the load transmission key is made of a hard magnetic material, the steel pipe is made of a soft magnetic material, so the load transmission key is attracted to the inward-key groove and the outward key groove. There is a risk that the position change work between the straddle position and the straddle position cannot be performed smoothly. If the load transmission key is made of a soft magnetic material as described above, there is no such possibility.

In the present invention, it is preferable that the suction portion is fixedly attached to the body portion of the operation member.

The suction portion can be easily attached to the body portion of the operating member, for example, by adhesion. The suction surface between the suction portion and the load transmission key slides while the body portion is being screwed.

In the present invention, it is preferable that the suction portion is attached to the body portion of the operation member so as to be rotatable relative to the body portion about the spiral axis of the body portion.

The suction portion can be easily attached to the body portion of the operation member by, for example, screwing a screw loosely inserted into the opening provided at the center of the suction portion to the body portion of the operation member. While the body portion is being screwed, the suction portion rotates with respect to the body portion, whereas the suction surface between the suction portion and the load transmission key does not slide. In this case, it is preferable that the body portion is made of a material that is not adsorbed by the adsorbing portion.

Explanatory drawing showing a part of a steel pipe pile connected by a steel pipe connecting mechanism. Explanatory drawing of steel pipe connecting mechanism Explanatory drawing of load transmission key and operation member in storage position Explanatory drawing of load transmission key and operation member in storage position Explanatory drawing of the load transmission key and operating member in the straddle position Explanatory drawing of the load transmission key and operating member in the straddle position Explanatory drawing for preventing the operation member from coming off Explanatory drawing about operation of load transmission key by operation member Explanatory drawing of operation member which concerns on another embodiment Explanatory drawing about operation of load transmission key by operation member which concerns on another embodiment Explanatory drawing about operation of load transmission key by operation member which concerns on another embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows steel pipe piles P (P1, P2) used in the middle digging method in which the digging is performed by rotationally press-fitting into the ground while excavating with an auger.

In the steel pipe pile P (P1, P2), the cylindrical joint 10 is welded and connected to one end of the steel pipe S (S1, S2) such as a spiral steel pipe, and the shaft joint 20 is welded and connected to the other end. It is a welded cylinder.

Steel pipe connection to connect the steel pipe ends of the steel pipes S (S1, S2) facing each other in the steel pipe piles P (P1, P2) adjacent to each other in the steel pipe axis X direction in a retaining state and in a rotation-preventing state. A mechanism J is provided.

As shown in FIG. 2, the steel pipe connecting mechanism J includes a cylindrical joint 10, a shaft-shaped joint 20, a load transmission key 30, and a rotation suppression key 40.

The tubular joint 10 is created by processing a steel tubular body. As shown in FIG. 2, a ridge 11 is provided on the lower end side of the tubular joint 10, and a plurality of cylindrical notch recesses 12 are provided at intervals in the circumferential direction. A peripheral groove 14 is provided on the upper end side of the inner peripheral surface 13 of the tubular joint 10.

The inner peripheral surface 13 is provided with two inward groove portions 15 along the circumferential direction. Each inward groove portion 15 is configured to be deeper than the thickness of the load transmission key 30 described later. As a result, as shown in FIGS. 3 and 4, the load transmission key 30 can be stored in the inward groove portion 15 at a storage position inside the inner peripheral surface 13.

The shaft-shaped joint 20 is created by processing a steel tubular body. As shown in FIG. 2, on the upper end side of the shaft-shaped joint 20, a ridge 21 that can be fitted into the peripheral groove 14 provided in the tubular joint 10 is provided.

When the tubular joint 10 and the shaft joint 20 are fitted to each other, the shaft side notch recess 22 is provided at a position facing the cylindrical notch recess 12 provided in the tubular joint 10. There is.
The cylinder-side notch recess 12 and the shaft-side notch recess 22 form a keyway 42 for the rotation restraint key 40, which will be described later. A female screw 26 to which a fixing screw 41 for fixing the rotation restraining key 40 to the key groove 42 can be screwed is provided in the central portion of the shaft side notch recess 22 (see FIG. 1).

The length of the outer peripheral surface 23 in the X direction of the steel pipe axis is substantially the same as the length of the inner peripheral surface 13 of the tubular joint 10 in the X direction of the steel pipe axis, and the outer diameter is large enough to fit into the inner peripheral surface 13. It is configured in. On the lower end side of the outer peripheral surface 23, a peripheral groove 24 into which the ridge 11 provided in the tubular joint 10 can be fitted is formed.

On the outer peripheral surface 23, the two outward groove portions 25 face the inward groove portion 15 when the tubular joint 10 and the shaft joint 20 are fitted to each other along the circumferential direction. It is prepared. The key groove 32 for the load transmission key 30 is configured from the inward groove portion 15 and the outward groove portion 25.

The load transmission key 30 is a member for connecting the cylindrical joint 10 and the shaft joint 20 in a retaining state when the tubular joint 10 and the shaft joint 20 are fitted to each other. The load transmission key 30 has a rectangular cross section, and the inner peripheral surface of the key facing the bottom surface of the outward groove portion 25 is formed in an arc shape having substantially the same curvature as the bottom surface. (See FIG. 4). In this embodiment, six pieces are provided around the steel pipe axis X.

The load transmission key 30 is composed of only a material containing iron or an iron group transition metal as a soft magnetic material that can be adsorbed by the adsorption unit 53, which is a hard magnetic material of the operation member 50 described later. The load transmission key 30 may have a configuration in which a member made of a soft magnetic material is provided only on a portion to be adsorbed by the suction portion 53.

The load transmission key 30 is pushed by the operation member 50 described later from the storage position stored in the inward groove portion 15 to the straddling position straddling the inward groove portion 15 and the outward groove portion 25 facing each other. The tubular joint 10 and the shaft joint 20 are connected in a retaining state. Further, the load transmission key 30 is pulled back from the straddling position to the retracted position by the operating member 50, so that the connection between the cylindrical joint 10 and the shaft-shaped joint 20 is released.

The tubular joint 10 is provided with through holes 16 having a circular cross section communicating from the outer peripheral surface thereof into the inward groove portion 15 at six locations at equal intervals in the circumferential direction corresponding to each load transmission key 30. .. As shown in FIGS. 3 and 4, a female screw 18 capable of screwing a male screw 52 provided on an outer peripheral surface of an operation member 50, which will be described later, is provided on the inner peripheral surface of the through hole 16.

As shown in FIGS. 3 and 4, the operating member 50 is a bolt-shaped member provided with a male screw 52 screwable into the female screw 18 of the through hole 16 on the outer peripheral surface of the cylindrical body portion 51. A suction portion 53 is provided on one end side of the body portion 51, and a tool such as a hexagon wrench for screwing the operation member 50 screwed into the through hole 16 can be fitted on the other end side of the body portion 51. A hole 54 is provided.

As the body portion 51, for example, a threaded rod of about M16 can be used. The length is such that the load transmission key 30 can be screwed into the through hole 16 even when the load transmission key 30 is pushed into the straddling position by the operation member 50, and the load transmission key 30 can be screwed into the through hole 16. Even when the 30 is held in the retracted position, the length is set so as not to protrude from the outer peripheral surface of the tubular joint 10.

The suction unit 53 is made of a hard magnetic material so that it can be sucked on the load transmission key 30 made of a soft magnetic material. In the present embodiment, the suction unit 53 is a permanent magnet made of neodymium. The suction portion 53 is fixedly attached to the body portion 51 by means such as adhesion. The permanent magnet may be made of alnico, ferrite or the like, and a permanent magnet having relatively excellent mechanical strength and attractive force is preferably adopted. The suction portion 53 has a thickness of about several mm, and its diameter is smaller than the outer diameter of the body portion 51.

With the above configuration, when the steel pipe pile P1 and the steel pipe pile P2 are connected, the operation member 50 screwed into the through hole 16 of the tubular joint 10 is screwed inward in the radial direction of the steel pipe, whereby the load transmission key is used. 30 can be moved from the storage position (see FIGS. 3 and 4) to the straddle position (see FIGS. 5 and 6) and fixed at that position as it is.

As shown in FIG. 7, the through hole 16 may be formed with a peripheral groove 17 for attaching the snap ring 19 near the outer peripheral surface of the tubular joint 10. The snap ring 19 attached to the peripheral groove 17 prevents the operating member 50 from falling out of the through hole 16 even if the operating member 50 rotates due to vibration during the burying work of the steel pipe pile P (P1, P2). Since the load transmission key 30 is maintained at the straddling position, there is no possibility that the connection between the tubular joint 10 and the shaft joint 20 will be disconnected.

As shown in FIG. 8, when the steel pipes are divided, the operating member 50 screwed into the through hole 16 of the tubular joint 10 is screwed outward in the radial direction of the steel pipe, so that the operating member 50 is attracted to the operating member 50. As a result, the load transmission key 30 is moved from the straddle position to the storage position and can be held as it is at that position. The suction portion 53 sucks while sliding with respect to the load transmission key 30 during the screwing of the body portion 51.

Next, another embodiment of the steel pipe connecting mechanism according to the present invention will be described. The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 9, the recess 31 may be provided at the center position in the longitudinal direction and the height direction of the load transmission key 30. On the other hand, the suction portion 53 includes a protruding portion 56 configured to project so as to be engageable with the recess 31. The protrusion 56 provided on the operation member 50 side engages with the recess 31 which is the engaged portion provided on the load transmission key 30 side, so that the load transmission key 30 has an outward groove portion or an inward groove portion. Is prevented from moving in the circumferential direction.
Therefore, the protruding portion 56 is the engaging portion according to the present invention.

Further, as shown in FIGS. 10 and 11, the suction portion 53 has a body portion having a screw 55 inserted through an opening provided in the center of a permanent magnet constituting the suction portion 53 on one end side of the body portion 51. It is attached so as to be screwed to the 51 so as to be relatively rotatable around the axis of the body 51. In this case, the body portion 51 and the screw 55 are preferably made of a material that is not adsorbed by the adsorption portion 53, such as austenitic stainless steel.

With the above configuration, when the load transmission key 30 is moved from the storage position to the straddle position (see FIG. 11) and when the load transmission key 30 is moved from the straddle position to the storage position (see FIG. 10) by the operating member 50, that is, While the suction portion 53 rotates with respect to the body portion 51 during the screwing of the body portion 51, the suction surface between the suction portion 53 and the load transmission key 30 does not slide.

Further, the suction portion 53 may be attached to the body portion 51 in such a manner that the suction portion 53 can move in the direction along the axis of the screw 55.

At this time, a recess 31 is provided at the center position in the longitudinal direction and the height direction of the load transmission key 30, and when the suction portion 53 is brought into contact with the body portion 51, the head portion 57 of the screw 55 becomes the suction portion 53. When the load transmission key 30 is fixed to the straddling position by the operating member 50 (see FIG. 11), the head 57 of the screw 55 is engaged with the load transmission key 30. By engaging with the recess 31 as a portion, the load transmission key 30 is prevented from moving in the circumferential direction in the outward groove portion or the inward groove portion. Therefore, the head 57 is the engaging portion according to the present invention. The suction portion 53 spins idle with respect to the body portion 51, whereas the suction portion 53 can suck with respect to the load transmission key 30 without sliding.

In the embodiment in which the suction portion 53 is attached to the body portion 51 by the screw 55 as shown in FIGS. 10 and 11, the head 57 of the screw 55 may be configured so as not to protrude from the surface of the suction portion 53. good. In this case, it is not necessary to provide the recess 31 in the load transmission key 30.

In the above-described embodiment, the case where the suction portion 53 attached to the operating member 50 is a permanent magnet has been described, but the present invention is not limited to this. The suction unit 53 may be composed of an electromagnet. At least, it is sufficient that a magnetic force can be generated when the load transmission key 30 is moved from the straddle position to the storage position.

In the above-described embodiment, the case where the permanent magnet as the suction portion 53 is attached to the operating member 50 has been described, but the present invention is not limited to this. The operating member 50 itself may be composed of a permanent magnet.

Steel pipe piles P (P1, P2) connected by the steel pipe connecting mechanism J include building support piles, landslide prevention piles, earth retaining column piles such as steel pipe sheet piles, partition walls, revetment walls, and structural columns. It can be used for various purposes. In addition to the middle digging method, the driving method that is performed by hitting, the pre-boring method that inserts into the existing drilling hole, or the soil cement synthetic pile method that is rotated and buried while creating soil cement. Or, it can be sunk by using a rotary buried pile method or the like, which simply rotates and press-fits (buries).

In the construction method in which the driving of the steel pipe involves rotation, a rotation suppression key 40 is attached in order to prevent the relative rotation of the steel pipe pile P1 and the steel pipe pile P2. As shown in FIG. 1, the rotation suppression key 40 is a member for connecting the tubular joint 10 and the shaft joint 20 in a non-rotating state, and is a member for connecting the tubular joint 10 and the shaft joint 20 in a non-rotating state, and the cylindrical notch recess 12 and the shaft side notch recess 22 facing each other. It is configured in a shape corresponding to the keyway 42 configured by the above.

When the tubular joint 10 and the shaft joint 20 are in a state of being fitted to each other, the rotation suppression key 40 is laid across the tubular side notch recess 12 and the shaft side notch recess 22 so as to extend to each other. Relative rotation between the connected steel pipe piles P (P1, P2) is prevented. The rotation restraint key 40 is fixed to the shaft-shaped joint 20 by the fixing screw 41.

In addition, when the construction method does not involve rotation in driving the steel pipe, the steel pipe connecting mechanism J does not have to be provided with the rotation suppressing key 40.

The steel pipe connecting mechanism J may be provided with a tubular joint 10 or a shaft joint 20 at the pipe end portion of a UO pipe, a bending pipe, a cast steel pipe cast by a centrifugal casting method, or the like.

The above-described embodiments are all examples of the present invention, and the description thereof does not limit the present invention, and the specific configuration of each part can be appropriately modified and designed within the range in which the effects of the present invention are exhibited. be.

10: Cylindrical joint 15: Inward groove 16: Through hole 20: Shaft joint 25: Outward groove 30: Load transmission key 31: Recess (engaged part)
50: Operation member 51: Body 52: Male screw 53: Suction part 56: Tip part (engagement part)
57: Head (engagement part)
J: Steel pipe connecting mechanism S: Steel pipe X: Steel pipe axis

Claims (4)

A tubular joint provided at one of the steel pipe ends facing each other of the steel pipes adjacent to each other in the direction of the steel pipe axis, and a tubular joint provided at the other steel pipe end and fitted to the tubular joint.
When the storage position stored in the inward groove provided on the inner peripheral surface of the tubular joint along the circumferential direction and the tubular joint and the shaft joint are fitted to each other, the said A load that can be changed in position between the outward groove portion provided along the circumferential direction on the outer peripheral surface of the shaft-shaped joint so as to face the inward groove portion and the straddle position straddling the inward groove portion. A steel pipe connecting mechanism with a transmission key,
A through hole in which the outer peripheral surface of the tubular joint and the inward groove portion are communicated with each other and a female screw is provided on the inner peripheral surface thereof.
An operating member provided with a male screw on the outer peripheral surface that can be screwed into the female screw of the through hole is provided.
The operating member is provided with a suction portion capable of sucking the load transmission key.
The operating member is provided with an engaging portion, and the operating member is provided with an engaging portion.
A steel pipe connecting mechanism , wherein the load transmission key is provided with an engaged portion to which the engaging portion can be engaged . The steel pipe connecting mechanism according to claim 1, wherein the suction portion is made of a hard magnetic material, and at least a part of the load transmission key is made of a soft magnetic material capable of sucking the suction portion. The steel pipe connecting mechanism according to claim 1 or 2, wherein the suction portion is fixedly attached to the body portion of the operating member. The steel pipe connection according to claim 1 or 2, wherein the suction portion is attached to the body portion of the operation member so as to be rotatable relative to the body portion about the spiral axis of the body portion. mechanism.

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