CN211898323U - Connecting piece and steel pipe pile using same - Google Patents

Abstract

The utility model provides a connecting piece and use steel-pipe pile of this connecting piece. The connecting piece is arranged at the upper end part of the steel pipe pile and comprises a cylindrical body part and a rotary fitting, wherein the peripheral surface of the body part protrudes out of the rotary fitting, the body part and the rotary fitting are integrally formed, and the rotary fitting extends downwards to the peripheral surface of the steel pipe pile. Has the advantages of stable connection and low cost.

Description

Connecting piece and steel pipe pile using same

Technical Field

The utility model relates to a steel-pipe pile technical field, concretely relates to dress is at the connecting piece on steel-pipe pile upper portion and uses the steel-pipe pile of this connecting piece.

Background

At present, in a foundation construction site, in order to obtain a strong supporting force in a narrow construction area, a steel pipe pile is buried in a foundation cement pile or soil. When a steel pipe pile is buried, a turning metal fitting is generally provided at the upper end of the steel pipe pile in order to rotate the steel pipe pile while turning the steel pipe pile and to transmit torque force by a clamping device so that the upper end of the steel pipe pile can be held.

The rotary fitting is directly welded to the outer peripheral surface of the upper end side of the steel pipe pile, and receives power transmitted from the clamping device through the rotary fitting, so that the steel pipe pile rotates and is pressed straight down into the soil. Specific examples can be found in Japanese patent laid-open No. 7-127055.

Disclosure of Invention

[ problem to be solved by the utility model ]

In the above-described structure in which the swivel fitting is welded to the upper end of the steel pipe pile, it takes time for the clamping device to align the position of the steel pipe pile, and the like, so that the piling work cost of the steel pipe pile is high.

The swivel fitting is generally a pipe made of steel, and when square steel is welded to the outer circumferential surface of a curved steel pipe pile, the consumption of welding material is large and the welding operation takes time to fill the space between the two members.

In another method, a part having the same diameter as the outer circumferential surface of the steel pipe pile is cut out from the inner surface of the square steel, and the square steel is deformed to form a swivel fitting, so that the swivel fitting is closely attached to the outer circumferential surface of the steel pipe pile, and the welding work is more easily performed.

The number of steel pipe piles to be combined is different depending on the embedding depth.

The manufacturing method of the steel pipe pile comprises the following steps: the lower tip of steel-pipe pile upper end portion and the steel-pipe pile that continues can have the condition at on-the-spot direct weld, the utility model discloses a correspond steel-pipe pile upper end portion and its steel-pipe pile's that continues lower tip welded connection spare at each steel-pipe pile upper end portion in advance, through this connecting piece under with steel-pipe pile upper end portion and its steel-pipe pile that continues, connect through mechanical key elements such as screw-nut, the utility model discloses a connecting piece with steel-pipe pile upper end portion is as improving the object.

The inventors of the present invention have realized that if the swivel fitting is provided in the connecting member, it is not necessary to provide the swivel fitting on the outer circumferential surface of the upper end side of the steel pipe pile, and thus have conceived the present invention.

[ means for solving problems ]

A connecting piece is arranged at the upper end part of a steel pipe pile and comprises a cylindrical body part and a rotary hardware fitting with a protruding outer peripheral surface of the body part.

When the tubular body portion and the rotary fitting are separate bodies, the work of welding the rotary fitting to the small-sized and lightweight body portion is time-saving and labor-saving as compared with the work of welding the rotary fitting to an extremely long and heavy steel pipe pile.

Further, the body portion and the swivel fitting are integrally formed, for example, by casting, so that the welding work described above is not required and the mechanical rigidity can be improved. In addition, the connecting piece formed by casting can also be designed into the shape of the rotary hardware fitting at will. Thus, it is easy to realize that the two side surfaces of the rotary fitting are parallel to each other at the cross section of the cylindrical body (the main point of the present invention is 3). The fitting of the rotary hardware fitting is more stable.

Further, the body portion is cylindrical in view of fitting of the swivel fitting to the clamp device, and the swivel fitting stands on a pair of outer side surfaces of the body portion and is parallel in cross section of the body portion, so that fitting to the clamp device is stable. The pair of imaginary surfaces extending from the outer side surfaces preferably sandwich the center axis of the steel pipe pile, and the pair of imaginary surfaces of the respective turning fittings preferably have the same distance to the center axis of the steel pipe pile. Thus, the torque force applied to each side surface can be equalized.

Further, the swivel fitting extends downwards to the outer peripheral surface of the steel pipe pile. The rotary hardware fitting arranged on the outer peripheral surface of the body part can be extended along the axial direction and extends to the outer peripheral surface of the steel pipe pile. The revolving fitting is prolonged, and the conjunction of the revolving fitting and the clamping device is more stable.

The body part of the connecting piece is used for fixing the upper end of the steel pipe pile by welding and other methods. The part extended to the steel pipe pile swivel fitting can be welded to the steel pipe pile. Therefore, the mechanical stability of the rotary hardware fitting is improved.

Although the shape of the metal fittings is not particularly limited, as described above, it is preferable that a pair of side surfaces rising from the outer peripheral surface of the body portion are parallel as viewed from the cross section of the body portion, and the side surfaces rising from the body portion of each metal fitting are parallel in the cross section of the body portion. The number of the rotary fittings can be arbitrarily selected, but 3 to 5 rotary fittings are preferably distributed on the outer peripheral surface of the main body part uniformly.

The fitting side surface may be a side surface standing vertically on the main body, and in this case, each side surface is preferably on an imaginary radial line extending from the center of the main body (on the central axis of the steel pipe pile) to the radial direction of the main body.

Further, an inner wall of the inner tooth of the body portion is attached with an inclined surface having a narrow lower side and a wide upper side.

The connecting piece in the foregoing is installed at the upper end of the steel pipe pile, prepared in advance in a factory, and moved to the site. When the steel pipe pile is buried in the soil on site, the upper end of the steel pipe pile is held by the clamping device, and the rotary fitting arranged on the connecting piece is matched with the clamping device in a connecting manner, so that the steel pipe pile is rotated and simultaneously drilled into the soil.

After the steel pipe pile is embedded into a specified depth, the clamping device is unlocked, and the exposed connecting piece at the upper end part of the steel pipe pile is connected with the connecting piece arranged at the lower end part of the connected steel pipe pile.

The connection between the connector at the upper end of the steel pipe pile and the connector at the lower end of the steel pipe pile is performed by a known connection method.

Drawings

Fig. 1 shows a connected body of steel pipe piles, (a) shows a side view in a state where several steel pipe piles are connected, (B) shows a side view in a state where (a) is rotated 90 degrees clockwise, and (C) shows a side view in a state where (a) the steel pipe piles are vertically separated.

Fig. 2 is an enlarged view of a joint part, where (a) is a partial side view of a state where two upper and lower steel-pipe piles are connected, and (B) is a partial side view of a state where the steel-pipe piles are separated from each other in the vertical direction in (a).

Fig. 3 is a longitudinal sectional view of fig. 2, (a) a longitudinal sectional view of fig. 2 (a), and (B) a longitudinal sectional view of fig. 2 (B).

FIG. 4 is a transverse sectional view of the connector, (C) is a sectional view taken along line C-C of FIG. 2, and (E) is a sectional view taken along line E-E.

Fig. 5 is an oblique perspective view of the connector, where (a) is an oblique view of the connector mounted on the upper end of the steel pipe pile, and (B) is an oblique view of the connector mounted on the lower end of the same steel pipe pile.

Fig. 6 is a front view of the connector, (a) is a front view of the connector attached to the upper end portion of the steel-pipe pile, and (B) is a front view of the connector attached to the lower end portion of the steel-pipe pile.

FIG. 7 is a cross-sectional view of another configuration of a connector configuration.

FIG. 8 shows a connector according to another embodiment, wherein (A) is a longitudinal sectional view in a separated state and (B) is a longitudinal sectional view in a joined state.

Detailed Description

The following describes embodiments of the present invention.

Fig. 1 (a) is a side view showing a state in which a plurality of steel pipe piles P1 to P3 are connected, fig. 1 (B) is a side view showing a state in which fig. 1 (a) is turned by 90 degrees in the circumferential direction, and fig. 1 (C) is a side view showing a state in which upper and lower steel pipe piles P2 and P3 are vertically separated.

The steel pipe piles P1 to P3 are connected in the vertical direction as shown in FIGS. 1A to C, and the upper ends thereof are installed by welding W. the connector 1 of the present invention (the connector 1 provided at the upper end of the steel pipe pile) is provided. The joints 1 are assembled by welding W at the lower end of each straight steel pipe pile Pn and are connected to the opposite joints 10 (the joints 10 provided at the lower end of the steel pipe pile) and can be rotated simultaneously. n is 1, 2, or 3 … …, and the number of steel pipe piles to be combined varies depending on the depth of embedding.

Further, a plurality of digging blades 22 are attached to the lower end surface (tip surface) 20 of the steel pipe pile P1 on the deepest side along the periphery thereof, and a helical fin 24 for turning up the soil to be dug is provided on the outer peripheral surface on the lower end side of the steel pipe pile P1.

As shown in the figure, a pair of rotary fittings 4 are provided to protrude from the outer surface of each of the connectors 1 at the upper end portions of the steel pipe piles P1 to P3 at positions symmetrical in plan view. The swivel fitting has a rectangular elongated shape, and the lower side thereof extends to the outer peripheral surface of the steel-pipe piles P1-P3 to be installed.

The connector 1 of the present invention is made of a cast steel material, and as shown in fig. 4 to 5, a body 2 having a cylindrical shape (cylindrical shape) on the outer peripheral side and a pair of rotary fittings protruding from the outer peripheral side are integrated. The outer diameter of the body 2 is substantially equal to the outer diameters of the steel pipe piles P1-P3. The inner side of the body part 2 is an inner tooth 3 which is in a regular octagonal plane view and penetrates through the steel pipe pile along the axial direction, and through holes forming regular four corners are formed on the inner wall surfaces at intervals among 8 inner wall surfaces of the inner tooth.

The pair of rotary fittings 4 are disposed on the outer peripheral surface of the body 2 corresponding to the inner teeth 3 having no through-hole 6 in the inner wall surface. Each side surface 4a of each of the rotary fittings 4 standing from the outer peripheral surface of the main body 2 (i.e., each of the side surfaces 4a standing on the outer peripheral surface of the main body 2) is parallel in a cross-sectional view of the main body, that is, as shown in fig. 4 (C), an imaginary plane formed by extending the side surface 4a, and a pair of imaginary planes of the same rotary fitting 4 preferably sandwich the center axis of the steel pipe pile, and it is preferable that the distances from the pair of imaginary planes of each of the rotary fittings to the center axis of the steel pipe pile are equal. Thus, the torque force applied to each side surface can be equalized.

An upper annular inclined surface 5 inclined to a lower position is formed at the inner side of the inner teeth 3 at the upper end part of the body part 2, a lower annular inclined surface 8 is also formed between the outer peripheral surface and the lower end surface of the body part 2, the position of the rotary metal tool 4 is removed from the lower annular inclined surface 8, a chamfer part for welding w at the upper end of the steel pipe pile P1-P3 by the connecting piece 1 at the upper end part of the steel pipe pile is formed, and the chamfer part is inwards recessed.

In another embodiment of the present invention, as shown in fig. 7, the side surface 4a of the metal return fitting 4 may be erected from the side surface of the main body 2, and the erection is perpendicular to the tangent line at the joint of the main body 2. At this time, each side surface 4a is present on a virtual radial line (a dotted line) extending from the center O to the radial direction of the main body 2.

The connector 10 at the lower end of the steel pipe pile, which is opposite to the connector 1 at the upper end of the steel pipe pile, is also made of a cast steel material, and as shown in fig. 2 and 4 (E), is made up of a main body B11 having a flat shape as a whole, an insertion portion 12 extending from the center side of the main body B11 in the axial direction and having an external octagonal column appearance, and a through hole 13 having a circular cross section and penetrating in the axial direction of the insertion portion 12 and the main body B11. The outer peripheral surface of the insertion portion 12 has a regular octagonal shape in plan view, and the insertion portion 12 is inserted through a slit in the inner teeth 3 of the connector 1 at the upper end of the steel pipe pile. That is, the inner teeth 3 of the connector 1 at the upper end of the steel pipe pile and the insertion portion 12 of the connector 10 at the lower end of the steel pipe pile may be engaged with each other in a concave-convex manner. The outer diameter of the body part B11 is substantially the same as the outer diameters of the steel pipe piles P1-P3.

The octagonal interval outer peripheral surface of the insertion portion 12 is provided with a recess 15 having an octagonal shape in a side view, and an inner thread hole 16 penetrating from the center of the bottom surface of the recess 15 to the through hole 13, and the recess 15 and the inner thread hole 16 form a coaxial center. As shown in fig. 2 (a), the recesses 15 of the connector 10 at the lower end of the steel-pipe pile and the through holes 6 of the connector 1 at the upper end of the steel-pipe pile communicate with each other when the insertion portion 12 is engaged with the inner teeth 3 of the connector 1 at the upper end of the steel-pipe pile.

The upper end surface of the body portion B11 is formed by a slope 17 sloping outward low along the circumferential outer side and a slope sloping inward low along the circumferential inner side. The inclined plane 17 inclined outwards at the lower part of the outer circumference forms a chamfer for welding the connecting piece 10 at the lower end part of the steel pipe pile to the lower end part of the steel pipe piles P1-P3.

Here, a method of connecting steel pipe piles P1 to P3 to be vertically adjacent to each other by using the connector 1 at the upper end portion of the steel pipe pile and the connector 10 at the lower end portion of the steel pipe pile will be described with reference to fig. 3(a) and (B).

As shown in the example of fig. 3(a), the connector 1 of the present invention is mounted on the upper ends of the steel-pipe piles P1 to P3 by welding W in advance, and the connector 10 at the lower end of the steel-pipe pile is mounted on the lower ends of the steel-pipe piles P2 and P3 by welding W, except for the lowest steel-pipe pile P1.

As shown in fig. 3(a), the joints between the steel pipe piles Pn connected up and down to P1 to P3 are provided with 4 sets of insertion keybeds 26 each having a regular octagonal side view and bolts 30 insertable into insertion holes 28 in the centers of the insertion keybeds 26. The shape of the insertion key seat 20 is similar to the shape of the through hole 6 of the connector 1 of the present invention and the concave portion 15 of the connector 10 at the lower end of the steel pipe pile, and the size is smaller than the size of the through hole 6 and the concave portion 15. Further, the outer side surface on which the key holder 26 is inserted may be larger than the outer diameter of the opening of the recess 27, and an insertion hole 28 may be formed between the central portion of the bottom surface of the recess 27 and the inner side surface.

Next, as shown in fig. 3 (B) example, at the site of pile driving, the inner side of the inner thread 3 of the connector 1 attached to the upper end of the previously driven steel-pipe pile P1 is fitted, and the insertion portion 12 of the connector 10 inserted into the lower end of the steel-pipe pile P2 is fitted. At this time, the through holes 6 of the connector 1 at the upper end of the steel-pipe pile P1 and the recesses 15 of the connector 10 at the lower end of the steel-pipe pile P2 are in a state of communication in the horizontal direction.

In the mounted state, the insertion key 26 is inserted into each of the through-holes 6 and the recess 15 from the outside, and at this time, the insertion key 26 serves to form stable connection between the connector 1 at the upper end portion of the steel-pipe pile P1 and the connector 10 at the upper end portion of the steel-pipe pile P1. Further, the outer thread portion of the bolt 30 penetrates the insertion hole 28 of each insertion key seat 26, and the leading end side of the outer thread portion is combined with the inner thread of the inner thread hole 16. At this time, the bottom of the shank of the bolt 30 contacts the inner face of the recess 27 of the insertion key bed 26 to maintain the stability of the connection.

As a result, as shown in fig. 3 (B), the upper steel-pipe pile P2 above the lower steel-pipe pile P1 is axially firmly connected to the upper steel-pipe pile P2 by the connector 1 at the upper end of the steel-pipe pile P1 and the connector 10 at the upper end of the steel-pipe pile P1.

In the mounted state, a pair of turning fittings 4 on the connector 1 at the upper end of the upper steel-pipe pile P2 are inserted between the connecting member stoppers turned by the hydraulic motor of the pile driver not shown, and the plurality of steel-pipe piles P1 and P2 connected vertically are turned together and sequentially pressed into the deep portion of the soil.

Use the utility model discloses a connecting piece 1 of steel-pipe pile upper end, because the outer peripheral face of this body part 2 is outstanding to be provided with an integrative a pair of gyration gold utensil, then do not need to weld gyration gold utensil on the steel-pipe pile, the operating efficiency obtains improving. In addition, the side surfaces 4a of the pair of swing fittings 4 are parallel and upright in a cross sectional view from the outer peripheral surface of the body portion 2, and the fitting relationship with the clamping device is stable. In addition, since the lower portion of the swivel fitting 4 extends to the outer peripheral surface of the steel pipe pile Pn, the area of the side surface 4a increases, and a large swivel torque transmitted from the pile driver is received by a wide area of the side surface 4a, and the torque can be reliably transmitted to the upper and lower steel pipe piles Pn through the connector 1 at the upper end portion of the steel pipe pile.

Fig. 8 (a) and (B) are partial vertical sectional views showing a state before and after connection of the upper end portion connector 1a of another steel-pipe pile and the upper and lower 2 steel-pipe piles P1 and P2.

As shown in fig. 8 (a) and (B), the connector 1a has a main body 2a having a substantially L-shaped cylindrical cross section in the vertical direction, a certain number of rotary fittings 4 protruding in the vertical direction on the outer peripheral side thereof, a regular octagonal insertion portion 12 at the center of the side wall of the main body 2a, and a through hole having a circular horizontal cross section axially penetrating the main body 2 a. In this case, the connector 10a corresponding to the lower end portion of the steel pipe pile has an outer peripheral surface substantially matching the outer diameter of the steel pipe pile Pn, and has an inner thread 3 having a regular octagonal shape in plan view on the inner side, and is composed of a main body 2b having a cylindrical shape as a whole. That is, the swivel fitting 4 of the present invention includes a form formed by the connecting pieces 1a of the outer flanks of various shapes in order to match the projections and recesses to be connected between the steel pipe piles.

The present invention is not limited to the embodiments.

For example, the inner wall of the inner teeth 3 of the connector 1 of the upper end of the steel-pipe pile according to the present invention may have a gently inclined surface with a narrow lower side (inner side) and a wide upper side (opening side), and the outer wall surface of the insertion portion 12 of the connector 10 of the lower end of the corresponding steel-pipe pile may have a gently inclined shape with a narrow lower side (opening side) and a wide upper side (inner side). Such a gentle slope is also applicable to the connecting members 1a, 10 a. Here, the gentle slope means that the slope on the upper side of the slope is smaller than the slope on the lower side.

The fitting 4 may be provided at 1 position or 3 positions or more on the outer peripheral surface of the body 2, 2a of the connecting member 1, 1a at the upper end portion of the steel pipe pile, and when the fitting 4 is provided at 3 positions or more, the fitting 4 may be point-symmetric to each other in a plan view.

In addition, if the swivel fitting 4 is provided with at least 1 side surface 4a, the side view may be in a semi-oval shape, an oval shape, or the like.

The swivel fitting 4 may be formed to protrude from the upper end to the lower end of the outer peripheral surface of the main body 2 in the entire height direction, or may be formed to extend to the upper end of the outer peripheral surface of the main body 2 and be assembled to the outer peripheral surface of the upper steel pipe pile Pn.

The through-hole 6 of the connector 1 at the upper end portion of the steel-pipe pile and the recess of the connector 10 at the lower end portion of the steel-pipe pile may have a circular, oval, elliptical, square, or rectangular shape or a regular polygonal or deformed polygonal shape in a side view, if they have the same shape and dimensions.

The outer peripheral surface of the main body 2 of the connector 1 at the upper end of the steel pipe pile and the inner teeth 3 may be square in plan view, for example, so that the corners of the square substantially match the outer peripheral surface of the steel pipe pile, and the outer peripheral surface of the insertion portion 12 of the connector 10 at the lower end of the steel pipe pile may be square in a similar shape. In the mounted state, the circular through hole 6 between the outer peripheral surface of the body 2 and the inner teeth 3 and the inner teeth hole 16 between the outer peripheral surface of the insertion portion 12 and the through hole 13 are used, and the normal circular and flat insertion key bed 26 and the thick screw 30 are used, so that the concavo-convex fit state between the inner teeth 3 of the connector 1 at the upper end portion of the steel pipe pile and the insertion portion 12 of the connector 10 at the lower end portion of the steel pipe pile can be maintained, which is also applicable to the connectors 1a and 10 a.

In order to maintain the male-female engagement between the female thread 3 of the connector 1 at the upper end of the steel pipe pile and the male portion 12 of the connector 10 at the lower end of the steel pipe pile, two horizontal anti-separation nails may be provided between the female thread 3 and the male portion 12 along the connecting direction therebetween to fix the male-female engagement in a parallel penetrating manner. The same applies to the connectors 1a, 10a in the mounting configuration.

[ possibility of Industrial use ]

Through the utility model discloses, can provide the protruding gyration gold utensil in the upper end of steel-pipe pile and pile driver interlock, provide the steel-pipe pile of connecting piece and use connecting piece that stabilizes and low-cost set up.

Claims (6)

1. The utility model provides a connecting piece, the connecting piece sets up the upper end at the steel-pipe pile, its characterized in that: the metal fitting comprises a cylindrical body part and a rotary metal fitting with a protruding outer peripheral surface of the body part.

2. The connector of claim 1, wherein: the body part and the rotation hardware fitting are integrally formed.

3. The connector of claim 1, wherein: the body part is cylindrical, the pair of rotary fittings stand on the outer side surface of the body part, and the rotary fittings are parallel when viewed from the cross section of the body part.

4. The connector of claim 1, wherein: the rotary hardware fitting extends downwards to the outer peripheral surface of the steel pipe pile.

5. The connector of claim 1, wherein: the inner wall of the inner tooth of the body part is attached with an inclined plane with a narrow lower side and a wide upper side.

6. A steel pipe pile provided with the connector according to any one of claims 1 to 5 at an upper end thereof.

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