Joint device and composite support pile

Abstract

To provide a joint device that can connect a steel pipe post and a steel pile without welding by combining a mechanical joint and a bolt joint, and a hybrid composite support pile that combines a steel pipe post and a steel pile.SOLUTION: A joint device 1 comprises a joint plate 10, a column connecting end 20 provided on an upper surface of the joint plate 10, and a pile connecting end 30 provided on a lower surface of the joint plate 10. The column connecting end 20 has a tubular body portion extending from the upper surface of the joint plate 10, a load transmission portion extending from the upper surface of the joint plate 10 into the inside of the tubular body portion, and a first joint portion provided at an end of an extending side of the tubular body portion. The pile connecting end has a shaped steel portion extending from the lower surface of the joint plate 10 and multiple second joint portions provided near an end of an extending side of the shaped steel portion. The load transmission portion has a cross shape in plan view consisting of a combination of multiple transmission plates erected from the upper surface of the joint plate 10, and all edge edges of the cross shape of the multiple transmission plates are connected to the lower part of the tubular body portion. A composite support pile is composed of a steel pipe column and a steel pile coaxially connected by the joint device 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint device and a composite support pile, and in particular to a joint device that can connect a steel pipe post and a steel pile without welding by combining a mechanical joint and a bolt joint, and a hybrid composite support pile that combines a steel pipe post and a steel pile. [Background technology]

[0002] Temporary piers, temporary platforms, and other scaffolding structures are constructed by assembling a scaffold by connecting the heads of multiple support piles that penetrate the ground with steel, and then installing a stage on top of the scaffolding. Heavy equipment, steel materials, and other heavy objects are loaded onto the stage of the platform structure, so the support piles are subjected to compressive axial force due to the load of the loaded objects and bending stress due to horizontal forces associated with movement and vibration. Patent Document 1 discloses a long support pile made of multiple circular steel pipes connected by welding their ends all around. Patent Document 2 discloses a support pile made of H-shaped steel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-7221 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-261165 Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional technology has the following problems. <1> Although the horizontal force acting on the embedded portion (pile portion) of a pile support made of circular steel pipe is not as great as that acting on the support portion, the design to meet the rigidity required for the support portion continues along the entire length, resulting in excessive costs for the pile portion and over-design of the entire mounting structure. In addition, because the joints are welded all around, construction quality varies depending on the welder's skill level. Furthermore, because all-around welding is usually done at high altitudes, the work is difficult and requires careful consideration of safety. <2> In order to resist horizontal stress acting on the support column, steel pile supports must be designed closely together and reinforced by connecting the support columns with diagonal members, which results in poor construction efficiency and high construction costs.

[0005] An object of the present invention is to provide a joint device and a composite support pile that solves the above-mentioned problems of the prior art. [Means for solving the problem]

[0006] The joint device of the present invention comprises a joint plate, a pillar connecting end provided on the upper surface of the joint plate, and a pile connecting end provided on the lower surface of the joint plate, wherein the pillar connecting end has a tubular body portion extending from the upper surface of the joint plate, a load transmission portion extending from the upper surface of the joint plate into the inside of the tubular body portion, and a first joint portion provided at the end of the extending side of the tubular body portion, and the pile connecting end has a structural steel portion extending from the lower surface of the joint plate and a second joint portion provided near the end of the extending side of the structural steel portion, and the load transmission portion has a cross shape in a plan view consisting of a transmission plate standing upright from the upper surface of the joint plate, and all edge portions of the cross shape of the transmission plate are connected to the lower part of the tubular body portion.

[0007] In the coupling device of the present invention, all of the cross-shaped end edges of the plurality of transmission plates may be inserted and welded into grooves provided in the lower part of the tubular body portion.

[0008] In the joint device of the present invention, the height of the tubular body portion may be at least twice the height of the load transmitting portion.

[0009] In the joint device of the present invention, the structural steel portion may be an H-beam consisting of a web and two flanges, and one side of the cross shape of the transmission plate may be arranged symmetrically to the web with the joining plate sandwiched therebetween.

[0010] In the joint device of the present invention, the load transmission portion may include a plurality of reinforcing plates connected to one side of the cross shape of the transmission plate and parallel to the other side.

[0011] In the joint device of the present invention, a plurality of reinforcing plates may be provided in a direction parallel to the flanges of the structural steel portions.

[0012] The composite support pile of the present invention is characterized by comprising a joint device, a steel pipe support connected to the support connection end, and a steel pile connected to the pile connection end coaxially with the steel pipe support. [Effects of the Invention]

[0013] The composite support pile of the present invention has at least one of the following effects. <1> The pile section ensures bearing capacity by embedding steel beams, while the support section uses steel pipe piles to ensure bending rigidity in addition to bearing capacity. This hybrid structure eliminates excessive design and reduces construction costs. <2> Since the rigidity of the steel pipe piles can resist the horizontal forces acting on the support columns, reinforcing members such as diagonal members are not required, and the spacing between the support piles can be designed to be wide. <3> Since the drilling diameter can be set based on the dimensions of the steel section, drilling can be done with a drilling machine with a diameter smaller than the outer diameter of the steel pipe pile.

[0014] The coupling device of the present invention has at least one of the following advantages. <1> Since the pile connecting section is connected to the pipe body section via a load transmission section erected on the connecting plate, the load can be transmitted efficiently from the steel pipe support to the steel pile while preventing bending deformation of the connecting plate. <2> The combination of mechanical joints and bolt joints allows for precise connection of steel pipe columns and steel piles. In addition, since no welding work is required, the work is safe and does not require skilled workers. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is an explanatory diagram of a coupling device according to the present invention; [Figure 2] Illustration of the connecting end of the support pillar [Figure 3] Diagram of the height of the tube body [Figure 4] Illustration of pile connection end [Figure 5] Diagram of how to connect steel pipe columns and steel piles [Figure 6] Illustrative diagram of composite support piles and mounting structure DETAILED DESCRIPTION OF THE INVENTION

[0016] The joint device and the composite support pile of the present invention will be described in detail below with reference to the drawings. Note that, in the present invention, the terms "up" and "down" in the joint device and the composite support pile refer to the respective directions when the composite support pile is driven into the ground. [Example]

[0017] [Coupling device] <1> Overall configuration (Figure 1) The joint device 1 of the present invention is a device for integrally connecting a steel pipe support pole A1 and a steel pile A2 to assemble a composite support pile A. In this example, a circular steel pipe is used as the steel pipe support pole A1, and an H-shaped steel is used as the steel pile A2. The joint device 1 includes a joint plate 10, a column connecting end 20 provided on the upper surface of the joint plate 10, and a pile connecting end 30 provided on the lower surface of the joint plate 10. In this example, a circular steel plate is used as the connecting plate 10. However, the connecting plate 10 is not limited to a circular steel plate, and rectangular or other polygonal steel plates can be used depending on the shapes of the support connecting end 20 and the pile connecting end 30.

[0018] <2> Pillar connection end (Figure 2) The support connecting end 20 is structured to connect to the steel pipe support A1. The support post connecting end 20 extends upward from the upper surface of the joining plate 10 . The pillar connecting end 20 comprises at least a tubular body portion 21 extending from the upper surface of the joining plate 10, a load transmission portion 22 extending from the upper surface of the joining plate 10 into the inside of the tubular body portion 21, and a first joint portion 23 provided at the end of the extending side of the tubular body portion 21. One of the features of the joint device 1 of the present invention is that by providing a load transmission part 22 directly above the pile connecting end 30, it is possible to prevent deformation of the joint plate 10 while rationally transmitting load from the steel pipe support A1 to the steel pile A2 via the load transmission part 22.

[0019] <2.1> Body The tubular body portion 21 is the main component of the support connecting end 20 . The tubular portion 21 is made of a tubular body whose open end surface is in contact with the upper surface of the joining plate 10 . In this example, a circular steel pipe is used as the pipe portion 21. The diameter of the tubular body portion 21 corresponds to the diameter of the steel pipe support A1. In this example, four connecting grooves 21a are provided in the lower part of the tubular part 21 at intervals of 90° when viewed from above. The connecting groove 21a extends upward from the lower end surface of the tubular portion 21 along the longitudinal direction of the tubular portion 21, and connects the outer peripheral surface and the inner peripheral surface of the tubular portion 21. The edges of the load transmission parts 22, which will be described later, are engaged with and welded to the inside of each connecting groove 21a. Note that the tubular part 21 may not be provided with connecting grooves 21a, and the edges of the load transmission parts 22 may be welded to the inner surface of the tubular part 21.

[0020] <2.1.1> Height of the tube body (Fig. 3) In this example, the height H of the tubular body portion 21 1 , the height H of the load transfer portion 22 2 In the height direction of the pipe portion 21, a certain distance (H 1 -H 2 ) to ensure When manufacturing the joint device 1, if the welding heat from the pipe body portion 21 is transmitted to the first joint portion 23 during the process of welding the pipe body portion 21 to the load transmission portion 22, thermal strain will occur in the first joint portion 23, which may make it difficult to connect the steel pipe support A1 to the first joint portion 23 during use. In this example, a certain distance is secured between the load transmitting portion 22 and the first joint portion 23, so that it is possible to prevent thermal strain from occurring in the joint portion 23 due to the transmission of welding heat.

[0021] <2.2> Load transmission part The load transmission portion 22 is a member that transmits the load on the composite support pile A from the pipe portion 21 to the connecting plate 10. The load transmission portion 22 has a cross shape in plan view and is made up of a combination of multiple transmission plates 22 a erected from the upper surface of the joining plate 10 , and all edges of the cross shape are connected to the lower part of the tubular portion 11 . In this example, the load transmission section 22 is constructed from a combination of a first transmission plate 22a' having a width corresponding to the outer diameter of the tubular section 21 and two second transmission plates 22a" each having the same height as the first transmission plate 22a' but approximately half the width. In detail, the first transmission plate 22a' is welded to the top surface of the joining plate 10, and two second transmission plates 22a" are welded from the top surface of the joining plate 10 to both sides of the center of the first transmission plate 22a'. In this example, the first transmission plate 22a' is disposed symmetrically with respect to the web 31a of the shaped steel section 31, sandwiching the connecting plate 10. This positions the first transmission plate 22a' directly above the web 31a in the longitudinal direction of the joint device 1, facilitating load transmission from the column connecting end 20 to the pile connecting end 30.

[0022] <2.2.1> Reinforcement plate In this example, the load transfer portion 22 includes four reinforcing plates 22b that are connected to the first transfer plate 22a' and parallel to the second transfer plate 22a''. More specifically, four reinforcing plates 22b parallel to the second transmission plate 22a'' are welded to both sides of the center and middle portions of the edges of the first transmission plate 22a' in the width direction. By providing the reinforcing plate 22b in a direction parallel to the flange 31b of the shaped steel portion 31, rational stress transmission from the column connecting end 20 to the pile connecting end 30 becomes possible.

[0023] <2.2.2> Joint structure between the tube body and the load transfer part In this example, the edge of the cross shape in plan view of the transmission plate 22a is welded to the lower part of the tubular part 21 by penetration welding. Specifically, when manufacturing the joint device 1, the edge of each transmission plate 22a is inserted into the connecting groove 21a of the tubular portion 21 and welded to the tubular portion 21 from the outside of the tubular portion 21. As mentioned above, in this example, the pillar connecting end 20 has a tubular body portion 21 that is more than twice as high as the load transmission portion 22, so when welding the tubular body portion 21 to the load transmission portion 22, it is difficult to weld from the inside of the tubular body portion 21. For this reason, in this example, a connecting groove 21a is provided in the tubular portion 21, and the edge of the transmission plate 22a is welded from the outside of the connecting groove 21a, thereby improving the workability and accuracy of welding.

[0024] <2.3> First joint The first joint portion 23 is a mechanical joint for connecting to the steel pipe support A1. The first joint portion 23 is provided near the tip of the tubular portion 21 . In this example, a pin joint welded to the tip of the tubular body portion 21 around its entire circumference is used as the first joint portion 23. The pin joint of the first joint part 23 is fitted into a box joint that is welded all around to the tip of the steel pipe pillar A1, and the pin is connected internally to the connecting surfaces of both, thereby connecting the pillar connecting end 20 to the steel pipe pillar A1 in a manner that allows stress to be transmitted. Such a fitting-type mechanical joint is known, for example, as the "Raknican Joint (registered trademark)" manufactured by Kubota Corporation. However, the structure of the first joint portion 23 is not limited to this, and other known mechanical joints such as screw type, bolt type, wedge type, etc. may be adopted.

[0025] <3> Pile connection end (Figure 4) The pile connecting end 30 is structured to connect with the steel pile A2. The pile connecting end 30 extends downward from the lower surface of the connecting plate 10 . The pile connecting end 30 includes at least a shaped steel portion 31 extending from the underside of the connecting plate 10, and a plurality of second joint portions 33 provided near the end portion of the extending side of the shaped steel portion 31. In this example, the second joint portion 33 includes a plurality of bolt holes 33a. In this example, the joining plate 10 further includes a plurality of reinforcing wing portions 32 extending from the lower surface of the joining plate 10 to the surface of the shaped steel portion 31 .

[0026] <3.1>Shaped steel section The structural steel portion 31 is the main component of the pile connecting end 30 . The shaped steel portion 31 is made of shaped steel extending downward from the lower surface of the joining plate 10 . In this example, an H-beam consisting of a combination of a web 31a and two flanges 31b is used as the shaped steel portion 31. However, the shaped steel portion 31 is not limited to an H-beam, and for example, an I-beam or the like may also be used. The dimensions of the shaped steel portion 31 correspond to the dimensions of the steel pile A2.

[0027] <4> Method of connecting steel pipe columns and steel piles (Figure 5) The joint device 1 is used to connect a steel pipe support A1 and a steel pile A2, for example, as follows. A box joint corresponding to the first joint portion 23 of the support connecting end 20 is welded to the lower end of the steel pipe support A1. A plurality of bolt holes are provided near the upper end of the steel pile A2. The steel pipe pillar A1 is connected to the pillar connecting end 20 by fitting the first joint portion 23 of the pillar connecting end 20 into the box joint of the steel pipe pillar A1 and connecting the pins internally to the connection surfaces of both joints. The lower end surface of the structural steel portion 31 of the pile connecting end 30 is abutted against the upper end of the steel pile A2, and the flange of the steel pile A2 and the flange 31b of the pile connecting end 30 are clamped by a splice plate A3 having multiple bolt holes.The steel pile A2 is connected to the pile connecting end 30 by connecting multiple fasteners A4 in series and tightening them into the bolt holes of the splice plate A3, the bolt holes 33a of the pile connecting end 30, and the bolt holes of the steel pile A2. By the above-described work, the steel pipe support A1 and the steel pile A2 can be coaxially connected without the need for on-site welding.

[0028] <5> Composite support pile and platform structure (Figure 6) The composite support pile A can be used to construct the platform structure B. The composite support pile A has a hybrid structure in which the bearing capacity is ensured by the embedded steel pile A2, while the steel pipe support A1 ensures bending rigidity of the support section against horizontal forces in addition to the bearing capacity. Therefore, reinforcing members such as braces for the mounting structure B are not required, and the spacing between adjacent composite support piles A of the mounting structure can be designed to be wide. In addition, since the drilling diameter can be set based on the dimensions of the steel pile A2, drilling can be performed using a drilling machine with a smaller diameter than the outer diameter of the steel pipe support A1. [Explanation of symbols]

[0029] 1. Coupling device 10 Joint plate 20 Post connection end 21 Tube body 21a Connection groove 22 Load transmission section 22a Transmission plate 22b Reinforcement plate 23 First joint 30 Pile connection end 31 Shaped steel section 31a Web 31b flange 32 Reinforced wing 33 Second joint 33a Bolt hole A Composite support pile A1 steel pipe support A2 steel pile A3 attachment plate A4 Fasteners B. Mounting structure

Claims

1. A joint device that can integrally connect a steel pipe support and a steel pile, A joining plate, A support connecting end provided on the upper surface of the joining plate; A pile connecting end provided on the underside of the joint plate, The pillar connecting end has a tubular portion extending from an upper surface of the joining plate, a load transmitting portion extending from the upper surface of the joining plate into the tubular portion, and a first joint portion provided at an end portion of the tubular portion on the extending side, The pile connecting end has a shaped steel portion extending from the underside of the joint plate and a second joint portion provided near the end portion of the extending side of the shaped steel portion, The load transmission portion has a cross shape in a plan view and is made of a transmission plate standing upright from the upper surface of the joining plate, All edges of the cross shape of the transmission plate are connected to the lower part of the tubular body portion. Coupling device.

2. All edges of the cross shape of the transmission plate are inserted into grooves formed in the lower part of the tubular body and welded. The coupling device of claim 1 .

3. The height of the tubular body portion is at least twice the height of the load transmission portion.

3. The coupling device of claim 2.

4. The shaped steel portion is an H-shaped steel consisting of a web and two flanges, One side of the cross shape of the transmission plate is arranged at a symmetrical position of the web with the joining plate sandwiched therebetween. The coupling device of claim 1 .

5. The load transmission portion is characterized in that it includes a plurality of reinforcing plates connected to one side of the cross shape of the transmission plate and parallel to the other side.

5. The coupling device of claim 4.

6. The plurality of reinforcing plates are provided in a direction parallel to the flanges of the shaped steel portion.

6. The coupling device of claim 5.

7. A coupling device according to any one of claims 1 to 6; A steel pipe support connected to the support connection end; A steel pile connected to the pile connection end coaxially with the steel pipe support, Composite support pile.

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