Connecting fitting set, and connecting method

Abstract

To provide a connecting fitting set that enables efficient connection of steel pipes and reinforcement cages used in constructing cast-in-place piles, without using welding.SOLUTION: A connecting fitting set 1 for connecting a steel pipe and a reinforcement cage used in constructing cast-in-place piles comprises: a fitting main body 10 attached to an opening edge of the steel pipe; and a rod-shaped joint 50 for connecting the fitting main body 10 to a main reinforcement of the reinforcement cage. The rod-shaped joint 50 comprises: a fastening portion 52 at one end that allows the fitting main body 10 to be fastened to align with the steel pipe; and an overlapping portion 55 at the other end that allows it to be fixed in an overlapping state with the main reinforcement of the reinforcement cage. The fitting main body 10 comprises: a fitting portion 11 that can be fitted into the opening edge of the steel pipe; an insertion portion 13 into which the fastening portion 52 of the rod-shaped joint 50 can be inserted; and a fixing portion 16 for fixing the steel pipe to the fitting portion 11 in a state where a pressing force is applied to the steel pipe that is fitted into the fitting portion 11.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a connecting fitting set and a connecting method, and more particularly, to a connecting fitting set for connecting a steel pipe and a reinforcing cage used for constructing a driven pile, and a connecting method for connecting a steel pipe and a reinforcing cage using the connecting fitting set.

Background Art

[0002] At a construction site of a structure, in order to enhance the seismic strength of the structure, etc., a construction method of driving piles into the ground to form a pile foundation for supporting the structure is generally adopted. One of the construction methods of the pile foundation is a construction method using driven piles, and one of such driven piles is a driven steel pipe concrete pile using a steel pipe at the pile head.

[0003] FIG. 9 is a side sectional view schematically showing an example of a conventional driven steel pipe concrete pile. The driven steel pipe concrete pile 80 has a lower reinforced concrete portion 82 where a reinforcing cage 81 is disposed, and an upper steel pipe concrete portion 84 where a steel pipe 83 is disposed, and is structured to be connected to a column or a foundation beam of a structure through a pile head joint portion (also referred to as a footing) 85 at the upper part of the steel pipe concrete portion 84.

[0004] At the lower part of the steel pipe concrete portion 84, a joint portion 86 for connecting the steel pipe 83 and the reinforcing cage 81 is constructed. Conventionally, the connecting work of the steel pipe 83 and the reinforcing cage 81 performed to construct the joint portion 86 has been carried out by on-site welding. The work by on-site welding has been performed, for example, in the following procedure. First, after temporarily supporting the reinforcing cage 81 on a casing (not shown) at the upper part of the pile hole 87, the lower part of the steel pipe 83 suspended by a crane or the like is covered with the upper part of the reinforcing cage 81 by a predetermined depth.

[0005] Then, after inserting a connecting bar (flat steel, angle steel, etc.) that is slightly longer than the outer diameter of the steel pipe 83 horizontally into the steel bar cage 81 from below the steel pipe 83, a short bar (short deformed bar steel) is arranged on the outer peripheral surface near the lower end of the steel pipe 83 so as to intersect the connecting bar and in a state where the connecting bar and the main bars (vertical bars) of the steel bar cage 81 intersect. Then, the outer peripheral surface near the lower end of the steel pipe 83, the short bar, the intersection of the short bar and the connecting bar, and the intersection of the connecting bar and the main bars of the steel bar cage 81 were joined by on-site welding.

[0006] As another connection method, Patent Document 1 below discloses that after welding a coupling bar to the inner peripheral surface near the lower end of a steel pipe at the welded part, the upper end of the steel bar cage and the coupling bar protruding downward from the steel pipe are overlapped at the upper part of the pile hole, and after lapping (overlapping joint) the coupling bar of the steel pipe and the upper end of the steel bar cage, a method of building the steel pipe and the steel bar cage together to a predetermined depth of the pile hole is disclosed.

[0007] [Problems to be Solved by the Invention] In the joint part 86 that connects the steel pipe 83 and the steel bar cage 81 as described above, when joining the steel pipe 83 and the steel bar cage 81 by on-site welding using the connecting bar, the short bar, or the coupling bar, etc., it is necessary to ensure a highly skilled welder on-site to ensure construction quality, and there is also a problem that the working efficiency deteriorates because the welding work takes time.

[0008] Also, according to "Road Bridge Specification and Explanation" (Japan Road Association, November 2017), welding construction may cause defects such as a reduction in the cross-section of the steel bars, so it is stipulated that direct welding should not be used on the main bars, which are the main components of the steel bar cage. In recent years, there has been a problem that there is a demand for a method of connecting a steel pipe and a steel bar cage used in the construction of cast-in-place piles without using welding.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Summary of the Invention

[0010] The present invention has been made in view of the above problems, and an object thereof is to provide a connecting fitting set and a connecting method capable of efficiently performing the work of connecting a steel pipe and a reinforcing cage used for constructing a cast-in-place pile without using welding.

[0011] To achieve the above object, a connecting fitting set (1) according to the present invention is a connecting fitting set for connecting a steel pipe and a reinforcing cage used for constructing a cast-in-place pile, including a fitting body attached to the opening edge of the steel pipe, and a rod-shaped joint for connecting the fitting body and the main reinforcing bars of the reinforcing cage, wherein the rod-shaped joint has a fastening portion on one end side that can fasten the fitting body in alignment with the position of the steel pipe, and a superimposing portion on the other end side that can be fixed in a state of being superimposed on the main reinforcing bars of the reinforcing cage, the superimposing portion and the main reinforcing bars of the reinforcing cage being configured to be fixable with a metal fitting for fixing reinforcing bars, and the fitting body having a fitting portion that can be fitted into the opening edge of the steel pipe, an insertion portion into which the fastening portion of the rod-shaped joint can be inserted, and a fixing portion for fixing the steel pipe to the fitting portion in a state where a pressing force is applied to the steel pipe in a state of being fitted into the fitting portion.

[0012] According to the above connecting fitting set (1), by using the fitting body having the fitting portion, the insertion portion, and the fixing portion, and the rod-shaped joint having the fastening portion and the superimposing portion, the work of connecting the steel pipe and the reinforcing cage can be efficiently performed without using welding.

[0013] Moreover, the connecting fitting set (2) according to the present invention is the above-mentioned connecting fitting set (1), wherein the fitting main body includes a pair of plate-like members arranged opposite to each other and a tubular member constituting the insertion portion, the fitting portion is constituted by notches formed at opposing positions of the pair of plate-like members, the tubular member is disposed between the pair of plate-like members in parallel with the depth direction of the notch, the fixing portion includes nuts fixed to the outer surfaces of the respective pair of plate-like members and set screws that can be screwed into these nuts, and the nuts are fixed in a direction in which the set screws can be screwed in a direction orthogonal to the depth direction of the notch.

[0014] According to the above-mentioned connecting fitting set (2), the fitting main body can be easily attached to the fastening portion of the rod-shaped joint, and the fitting portion constituted by the notches formed at opposing positions of the pair of plate-like members can be easily fitted into the opening edge portion of the steel pipe, thereby improving the efficiency of the connecting operation. Furthermore, the fitting main body can be firmly and reliably fixed to the opening edge portion of the steel pipe by the nuts and the set screws constituting the fixing portion.

[0015] Moreover, the connecting fitting set (3) according to the present invention is the above-mentioned connecting fitting set (2), wherein the notch is formed with a locking portion that can be locked to an annular protrusion formed on the inner surface of the steel pipe.

[0016] According to the above-mentioned connecting fitting set (3), it becomes possible to lock the locking portion formed in the notch to the annular protrusion formed on the inner surface of the steel pipe, and the fitting main body can be fixed more firmly and reliably to the opening edge portion of the steel pipe, thereby enhancing the effect of preventing displacement of the connected reinforcing cage.

[0017] Moreover, the connecting fitting set (4) according to the present invention is characterized in that, in the above-mentioned connecting fitting set (2) or (3), the tubular member is disposed on both sides of the notch portion.

[0018] According to the above-mentioned connecting fitting set (4), since the tubular member is disposed on both sides of the notch portion, it can be used when connecting the fitting body to the reinforcing cage at the lower part of the steel pipe and when connecting the fitting body to the reinforcing cage at the upper part of the steel pipe. That is, the fitting body can be attached to the lower opening edge of the steel pipe, the fastening portion of the rod-shaped joint can be inserted into the tubular member and fastened, and the overlapping portion of the rod-shaped joint can be fixed in a state of being overlapped with the main reinforcement of the reinforcing cage. Also, the fitting body can be attached to the upper opening edge of the steel pipe, the fastening portion of the rod-shaped joint can be inserted into the tubular member and fastened, and the overlapping portion of the rod-shaped joint can be fixed in a state of being overlapped with the main reinforcement of the reinforcing cage.

[0019] Moreover, the connecting fitting set (5) according to the present invention is, in the above-mentioned connecting fitting set (1), The fitting body includes a plate-shaped member having a notch portion in a substantially L shape and a tubular member constituting the insertion portion, The tip of the short side of the notch portion of the plate-shaped member and one side surface of the tubular member are fixed in a state where the long side of the notch portion and one side surface of the tubular member are opposed to each other, The fitting portion is formed by the notch portion and one side surface of the tubular member, The fixing portion includes nuts fixed to both side surfaces of the tubular member in a direction parallel to the extending direction of the short side of the notch portion, and set screws that can be screwed onto these nuts. It is characterized in that the nuts are fixed in a direction in which the set screws can be screwed in a direction orthogonal to the extending direction of the long side of the notch portion.

[0020] According to the above connecting fitting set (5), the fitting body can be easily attached to the fastening portion of the rod-shaped joint. Also, the fitting portion formed by the notch portion having a substantially L-shaped configuration and one side surface of the tubular member can be easily fitted to the opening edge portion of the steel pipe, thereby enhancing the efficiency of the connecting operation. Further, the fitting body can be firmly and reliably fixed to the opening edge portion of the steel pipe by the nut and the set screw that constitute the fixing portion. Also, by using the plate-shaped member having the notch portion with a substantially L-shaped configuration for the fitting body, it is possible to reduce the weight of the fitting body and the cost.

[0021] Also, the connecting fitting set (6) according to the present invention is the connecting fitting set (5) in which the fitting body further includes a reinforcing member fixed to the other side surface opposite to one side surface of the tubular member, and the nut is characterized in that it is fixed to the tubular member and the reinforcing member.

[0022] According to the above connecting fitting set (6), since the nut fixed to both side surfaces of the tubular member is fixed to the tubular member and the reinforcing member, the mounting strength of the nut can be enhanced, and the steel pipe fitted into the fitting portion can be firmly fixed by the set screw screwed to the nut.

[0023] Also, the connecting fitting set (7) according to the present invention is the connecting fitting set (5) or (6) in which a locking portion capable of locking to an annular protrusion formed on the inner surface of the steel pipe is formed in the notch portion.

[0024] According to the above connecting fitting set (7), the locking portion formed in the notch portion can be locked to the annular protrusion formed on the inner surface of the steel pipe, so that the fitting body can be fixed more firmly and reliably to the opening edge portion of the steel pipe, and the effect of preventing displacement of the connected reinforcing cage can be enhanced.

[0025] Moreover, the connecting fitting set (8) according to the present invention is any one of the above connecting fitting sets (1) to (7), wherein the rod-shaped joint is made of a steel bar bent according to the difference between the outer diameter or inner diameter of the steel pipe and the diameter of the steel bar cage, and the fastening portion is formed by a threaded portion with one end side of the steel bar being threaded, and a set of nuts for positioning and fastening the fitting body to the threaded portion is configured to be screwable.

[0026] According to the above connecting fitting set (8), since the rod-shaped joint is made of a steel bar bent according to the difference between the outer diameter or inner diameter of the steel pipe and the diameter of the steel bar cage, the fastening portion of the rod-shaped joint can be arranged close to the steel pipe, and the overlapping portion can be arranged close to the main bars of the steel bar cage, respectively. In addition, since the fastening portion is formed by the threaded portion and the set of nuts is configured to be screwable to the threaded portion, the fastening position of the fitting body inserted into the threaded portion can be easily adjusted by the set of nuts.

[0027] Moreover, the connecting fitting set (9) according to the present invention is the connecting fitting set (8) above, wherein a displacement prevention bar for preventing displacement of the connection position with the main bars of the steel bar cage is fixed to the other end side of the steel bar serving as the overlapping portion, and the overlapping portion and the displacement prevention bar are configured to be fixable to the main bars of the steel bar cage with the steel bar fixing fittings.

[0028] According to the above connecting fitting set (9), since the displacement prevention bar is fixed to the other end side of the steel bar serving as the overlapping portion, the overlapping portion and the main bars of the steel bar cage can be firmly fixed with the steel bar fixing fittings.

[0029] Moreover, the connecting fitting set (10) according to the present invention is any one of the above connecting fitting sets (1) to (7), The bar-shaped joint is made of a steel bar bent according to the difference between the outer diameter or inner diameter of the steel pipe and the diameter of the steel cage of the reinforcing cage, The fastening part is composed of a screw member attached to one end side of the steel bar, and a pair of nuts for positioning and fastening the fitting body to the screw member are configured to be screwable.

[0030] According to the above connecting fitting set (10), since the bar-shaped joint is made of a steel bar bent according to the difference between the outer diameter or inner diameter of the steel pipe and the diameter of the steel cage of the reinforcing cage, the fastening part of the bar-shaped joint can be arranged close to the steel pipe and the overlapping part can be arranged close to the main bars of the reinforcing cage, respectively. In addition, since the fastening part is composed of the screw member and the pair of nuts are configured to be screwable to the screw member, the fastening position of the fitting body inserted into the screw member attached to one end side of the steel bar can be easily adjusted by the pair of nuts.

[0031] In addition, the connecting fitting set (11) according to the present invention is the above connecting fitting set (10), wherein the steel bar is composed of a deformed steel bar, and the overlapping part on the other end side of the steel bar is configured to be fixable to the main bars of the reinforcing cage with the steel bar fixing fitting.

[0032] According to the above connecting fitting set (11), since the steel bar is composed of a deformed steel bar, the overlapping part on the other end side of the steel bar and the main bars of the reinforcing cage can be firmly fixed with the steel bar fixing fitting.

[0033] In addition, the connecting method (12) according to the present invention is a method of connecting a steel pipe and a reinforcing cage using any one of the above connecting fitting sets (1) to (11), After temporarily receiving the reinforcing cage in the casing at the upper part of the pile hole, a step of overlapping the overlapping part of the bar-shaped joint on the main bars of the reinforcing cage and attaching the bar-shaped joint to the main bars with a steel bar fixing fitting, Inserting the insertion part of the fitting body into the fastening part of the rod-shaped joint attached to the main reinforcement bar, and temporarily fixing the fitting body to the fastening part with the fitting part facing upward; Covering the lower part of the steel pipe with the reinforcing cage up to a predetermined fixing position; Positioning and fastening the fitting body to the fastening part with the fitting part of the fitting body fitted into the lower opening edge part of the steel pipe; Fixing the steel pipe to the fitting part with a pressing force applied to the steel pipe by the fixing part of the fitting body, and is characterized by including this.

[0034] According to the above connection method (1), by using the connection fitting set including the fitting body having the fitting part, the insertion part, and the fixing part, and the rod-shaped joint having the fastening part and the overlapping part, the work of connecting the lower part of the steel pipe and the upper part of the reinforcing cage can be efficiently performed without using welding.

[0035] Further, the connection method (2) according to the present invention is a method of connecting a steel pipe and a reinforcing cage using the above connection fitting set (1), including a step of temporarily supporting the steel pipe on the casing at the upper part of the pile hole and then building the reinforcing cage into the steel pipe, and the building step includes a step of overlapping the overlapping part of the rod-shaped joint on the main reinforcement bar of the reinforcing cage and attaching the rod-shaped joint to the main reinforcement bar with a metal fitting for fixing the reinforcement; after attaching the rod-shaped joint to the main reinforcement bar, further building the reinforcing cage into the steel pipe, and when the fastening part of the rod-shaped joint is located at the upper opening edge part of the steel pipe, inserting the insertion part into the fastening part of the rod-shaped joint with the fitting part of the fitting body facing downward, and positioning and fastening the fitting body to the fastening part with the fitting part fitted into the upper opening edge part of the steel pipe; fixing the steel pipe to the fitting part with a pressing force applied to the steel pipe by the fixing part of the fitting body, and is characterized by including this.

[0036] According to the above connecting method (2), by using the connecting fitting set including the fitting body having the fitting portion, the insertion portion, and the fixing portion, and the rod-shaped joint having the fastening portion and the overlapping portion, the operation of connecting the upper portion of the steel pipe and the upper portion of the reinforcing cage can be efficiently performed without using welding.

Brief Description of the Drawings

[0037]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying out the Invention

[0038] Hereinafter, embodiments of the connecting fitting set and the connecting method according to the present invention will be described with reference to the drawings. The following-described embodiments are preferred specific examples of the present invention, and thus are technically preferably subject to various limitations. However, the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description to particularly limit the present invention.

[0039] FIG. 1 is a front view showing a state before assembling the connecting fitting set 1 according to Embodiment (1) of the present invention. FIG. 2 is a right side view of FIG. 1. The connecting fitting set 1 is for connecting a steel pipe 83 and a steel cage 81 (see FIG. 3) used for constructing a driven pile. It includes a fitting body 10 attached to the lower opening edge of the steel pipe 83, and a rod-shaped joint 50 for connecting the fitting body 10 and the main bars 81a of the steel cage 81 (see FIG. 3).

[0040] The rod-shaped joint 50 includes a fastening portion 52 that can fasten the fitting body 10 in alignment with the position of the steel pipe 83 on one end (upper end) side, and a superposition portion 55 that can be fixed in a state of being superposed on the main bars 81a of the steel cage 81 on the other end (lower end) side. The superposition portion 55 and the main bars 81a of the steel cage 81 can be fixed with a steel bar fixing fitting 70 (see FIG. 3).

[0041] The rod-shaped joint 50 is composed of a round steel (bar steel) 51 that is bent into a shape in which both ends are shifted parallel to each other according to the difference between the outer diameter of the steel pipe 83 and the cage diameter of the steel cage 81 (also referred to as a reducer shape). The fastening portion 52 of the rod-shaped joint 50 includes a threaded portion 53 in which one end side of the round steel 51 is threaded, and a set of nuts including a lower nut 54a and an upper nut 54b for positioning and fastening the fitting body 10 to the threaded portion 53 are configured to be screwable.

[0042] In the overlapping portion 55 of the rod joint 50, a displacement prevention bar 56 for preventing displacement of the connection position with the main reinforcement 81a of the reinforcing cage 81 is fixed to the round steel 51. The displacement prevention bar 56 is composed of, for example, a deformed bar having substantially the same diameter as the round steel 51. And the round steel 51 and the displacement prevention bar 56 in the overlapping portion 55 are configured to be fixable to the main reinforcement 81a of the reinforcing cage 81 with a reinforcing bar fixing fitting 70.

[0043] The fitting body 10 includes a fitting portion 11 that can be fitted into the lower opening edge of the steel pipe 83, an insertion portion 13 into which a screw portion 53 constituting the fastening portion 52 of the rod joint 50 can be inserted, and a fixing portion 16 for fixing the steel pipe 83 to the fitting portion 11 while applying a pressing force to the steel pipe 83 in a state where it is fitted into the fitting portion 11.

[0044] More specifically, the fitting body 10 includes a pair of plate-like members 12 arranged opposite to each other and a tubular member 14 constituting the insertion portion 13, and the fitting portion 11 is composed of a substantially U-shaped notch portion 12a formed at the opposing positions of the pair of plate-like members 12. A tubular member 14 and a reinforcing plate 15 are provided between the pair of plate-like members 12. The tubular member 14 is provided at a position parallel to the depth direction of the notch portion 12a and outside the steel pipe 83 in a state where it is fitted into the fitting portion 11. The reinforcing plate 15 is provided at a position parallel to the depth direction of the notch portion 12a and opposite to the tubular member 14 through the notch portion 12a. The pair of plate-like members 12 are composed of, for example, steel plates, and the thickness of the steel plates is appropriately set according to specifications such as required strength. The tubular member 14 is composed of, for example, a small-diameter steel pipe having a length of about 100 mm to 150 mm, and the reinforcing plate 15 is composed of, for example, a flat bar having a strip shape with the same width as the diameter of the tubular member 14. The tubular member 14 and the reinforcing plate 15 are fixed to the pair of plate-like members 12 by, for example, welding.

[0045] In the notch portion 12a that constitutes the fitting portion 11, a locking portion 12b that can be locked to an annular protrusion (also referred to as a rib) 83a formed on the inner surface of the steel pipe 83 (see FIG. 3) is formed. The locking portions 12b are formed at intervals approximately the same as the intervals between the protrusions 83a of the steel pipe 83. The shape of the locking portion 12b is triangular in a front view, but is not limited to this shape and may be formed in other shapes that can be locked to the protrusions 83a of the steel pipe 83. The notch portion 12a and the locking portion 12b are formed, for example, by laser cutting a steel plate that constitutes the plate-like member 12.

[0046] The fixing portion 16 includes nuts 17 fixed to the outer surfaces of the pair of plate-like members 12, respectively, and set screws 18 that can be screwed onto these nuts 17. The nut 17 is fixed in a direction in which the set screw 18 can be screwed in a direction orthogonal to the depth direction of the notch portion 12a. The number of nuts 17 attached is not particularly limited, but in order to increase the fixing force with the steel pipe 83, it is preferable to provide two or more on the outer surface of each of the pair of plate-like members 12.

[0047] The set screw 18 is constituted by, for example, a set screw with a hexagonal hole (also referred to as a hollow set). There are various tip shapes (concave tip, flat tip, pointed tip, rod tip, double point, etc.) for the set screw 18, but in order to increase the fixing force with the steel pipe 83, it is preferable to use a pointed tip shape.

[0048] Next, with reference to FIG. 3, an example of the working procedure for connecting the steel pipe 83 and the reinforcing cage 81 used for constructing the cast-in-place pile using the connecting fitting set 1 according to the embodiment (1) will be described. FIG. 3 shows an example of a method (covering type connection method) of connecting the reinforcing cage 81 and the steel pipe 83 in a state where the lower part of the steel pipe 83 covers the upper part of the reinforcing cage 81 that constitutes the reinforced concrete part at the lower part of the cast-in-place steel pipe concrete pile.

[0049] Fig. 3(a) shows a temporary support state in which the steel cage 81 is erected inside the casing 88 arranged in the pile hole, and the upper part of the steel cage 81 is supported at the opening of the casing 88 using a receiving jig (not shown). The steel cage 81 includes a large number of main reinforcing bars 81a arranged in the central axis direction on the circumference, a large number of hoop reinforcing bars 81b substantially orthogonal to the main reinforcing bars 81a, and a plurality of reinforcing rings 81c that are in contact with the main reinforcing bars 81a from the inside of the steel cage 81 and are fixed at the intersection with the main reinforcing bars 81a.

[0050] After the steel cage 81 is temporarily supported at the opening of the casing 88 at the upper part of the pile hole, as shown in Fig. 3(b), the overlapping portion 55 at the lower end side of the rod joint 50 is overlapped with the main reinforcing bar 81a of the steel cage 81, and the rod joint 50 is attached to the main reinforcing bar 81a using the steel bar fixing fitting 70. At this time, the overlapping portion 55 of the rod joint 50 is arranged in a state of being overlapped laterally with respect to the main reinforcing bar 81a so as to be located on the circumference of the steel cage 81 formed by a large number of main reinforcing bars 81a. Also, the overlapping position of the overlapping portion 55 of the rod joint 50 and the main reinforcing bar 81a of the steel cage 81 is adjusted so that the position of the screw portion 53 at the upper end side of the rod joint 50 is near the position of the lower end opening of the steel pipe 83 (predetermined fixing position) when the steel pipe 83 is put on the steel cage 81 in a later process. Also, a plurality of rod joints 50 are arranged at predetermined intervals on the circumference of the steel cage 81 formed by a large number of main reinforcing bars 81a. The predetermined interval is appropriately designed in consideration of the size (diameter, outer peripheral length), weight, etc. of the steel cage 81.

[0051] The steel bar fixing fitting 70 includes a U-bolt 71, a plate 72 formed with a through hole that can be inserted into the tip screw portion of the U-bolt 71, and a nut 73 that can be screwed onto the tip screw portion of the U-bolt 71. The attachment of the steel bar fixing fitting 70 is performed by fitting the U-bolt 71 to the main reinforcing bar 81a and the overlapping portion 55 in a state where the main reinforcing bar 81a and the overlapping portion 55 are overlapped as described above, and then attaching the plate 72 and the nut 73 to the U-bolt 71 and fastening the nut 73. Note that at this stage, it is not necessarily required to firmly fasten the nut 73, and it is sufficient to fasten the nut 73 to such an extent that the main reinforcing bar 81a and the overlapping portion 55 do not come off.

[0052] After temporarily fixing the overlapping portion 55 to the main reinforcement bar 81a, a lower nut 54a is screwed onto the screw portion 53 on one end side of the bar-shaped joint 50. Note that the lower nut 54a may be pre-screwed onto the screw portion 53. Then, with the notch portion 12a facing upward, the tubular member 14 of the fitting body 10 is inserted into the screw portion 53 of the bar-shaped joint 50, and the fitting body 10 is inserted onto the screw portion 53 so that the fitting body 10 is supported by the lower nut 54a screwed onto the screw portion 53 as shown in Fig. 3(c).

[0053] Next, as shown in Figs. 3(c) and (d), the steel pipe 83 suspended by a crane or the like is placed in a state of covering the main reinforcement bar 81a of the steel bar cage 81 up to a predetermined fixing position (joint length) marked thereon. At this time, as shown in Fig. 3(d), the lower end opening of the steel pipe 83 is fitted into the notch portion 12a of the fitting body 10 supported by the bar-shaped joint 50 to some extent.

[0054] Thereafter, while adjusting the height position of the lower nut 54a screwed onto the screw portion 53 of the bar-shaped joint 50, as shown in Figs. 3(d) and (e), the positioning of the fitting body 10 is performed so that the locking portion 12b formed in the notch portion 12a of the fitting body 10 is locked to the protrusion 83a formed inside the steel pipe 83.

[0055] After the position adjustment of the fitting body 10 by the lower nut 54a is completed, as shown in Figs. 3(e) and (f), an upper nut 54b is screwed onto the screw portion 53 of the bar-shaped joint 50, and the fitting body 10 is fastened (fixed) to the screw portion 53 by these upper and lower nuts 54a and 54b. Further, the set screw 18 screwed to the nut 17 constituting the fixing portion 16 of the fitting body 10 is screwed toward the outer peripheral surface of the steel pipe 83, and the outer peripheral surface of the steel pipe 83 is strongly pressed by the tip of the set screw 18 to fix the fitting body 10 and the steel pipe 83. Also, the nut 73 of the reinforcing bar fixing fitting 70 that temporarily fixes the main reinforcing bar 81a and the overlapping portion 55 is tightened further to fix the main reinforcing bar 81a and the rod-shaped joint 50. These reinforcing bar fixing fittings 70, the pair of nuts 54a and 54b, the set screw 18, etc. can be attached using a power tool such as an impact wrench.

[0056] After finishing the connection work between the main reinforcing bars 81a of the reinforcing cage 81 and the steel pipe 83 by all the connection fitting sets 1 arranged on the circumference of the reinforcing cage 81, the connected steel pipe 83 and the reinforcing cage 81 are lifted, and after removing the receiving jig (not shown) of the reinforcing cage 81 arranged above the casing 88, the work of building them into the pile hole is carried out.

[0057] According to the connection fitting set 1 according to the above-described embodiment (1), by using the fitting body 10 having the fitting portion 21, the insertion portion 13, and the fixing portion 16, and the rod-shaped joint 50 having the fastening portion 52 and the overlapping portion 55, the work of connecting the steel pipe 83 and the reinforcing cage 81 can be efficiently performed without using welding.

[0058] Also, the tubular member 14 of the fitting body 10 can be easily attached to the fastening portion 52 (threaded portion 53) of the rod-shaped joint 50, and the fitting portion 11 formed by the notches 12a formed at the opposing positions of the pair of plate-shaped members 12 can be easily fitted to the lower opening edge portion of the steel pipe 83, improving the efficiency of the connection work. Further, the fitting body 10 can be firmly and reliably fixed to the lower opening edge portion of the steel pipe 83 by the nut 17 and the set screw 18 constituting the fixing portion 16.

[0059] Since the locking portion 12b is formed in the notch 12a of the fitting body 10, the locking portion 12b can be locked to the annular protrusion 83a formed on the inner surface of the steel pipe 83, and the fitting body 10 can be more firmly and reliably fixed to the lower opening edge of the steel pipe 83, enhancing the effect of preventing displacement of the connected steel cage 81.

[0060] Moreover, since the rod-shaped joint 50 is composed of a round steel 51 bent according to the difference between the outer diameter of the steel pipe 83 and the diameter of the steel cage 81, the fastening portion 52 of the rod-shaped joint 50 can be arranged close to the steel pipe 83 and the overlapping portion 55 can be arranged close to the main reinforcement 81a of the steel cage 81 respectively. In addition, since the fastening portion 52 is composed of a threaded portion 53 and a set of upper and lower nuts 54a, 54b can be screwed onto the threaded portion 53, the fastening position of the fitting body 10 inserted into the threaded portion 53 can be easily adjusted by the set of upper and lower nuts 54a, 54b. Also, since the displacement prevention bar 56 is fixed to the other end side of the round steel 51 serving as the overlapping portion 55 of the rod-shaped joint 50, the overlapping portion 55 and the main reinforcement 81a of the steel cage 81 can be firmly fixed by the steel bar fixing fitting 70.

[0061] According to the method of connecting the steel pipe 83 and the steel cage 81 using the connecting fitting set 1 according to the embodiment (1) described with reference to FIG. 3, by using the connecting fitting set 1 including the fitting body 10 having the fitting portion 11, the insertion portion 13, and the fixing portion 16, and the rod-shaped joint 50 having the fastening portion 52 and the overlapping portion 55, the operation of connecting the lower part of the steel pipe 83 and the upper part of the steel cage 81 can be efficiently performed without using welding.

[0062] Note that, for the construction of the driven pile shown in FIG. 3, an example is shown in which a steel pipe 83 with a protrusion 83a formed on the inside is used. However, the connecting fitting set 1 is also applicable when connecting a steel pipe 83 without a protrusion 83a formed on the inside and a steel cage 81.

[0063] FIG. 4 is a diagram showing a schematic configuration of a fitting body 20 constituting a connecting fitting set 1A according to Embodiment (2), where (a) is a front view, (b) is a right side view, (c) is a left side view, and (d) is a plan view. Note that since the rod-shaped joint constituting the connecting fitting set 1A according to Embodiment (2) is composed of the same one as the rod-shaped joint 50 (see FIGS. 1 and 2) of the connecting fitting set 1 according to Embodiment (1), the same reference numerals are given here and the description thereof is omitted.

[0064] The fitting body 20 constituting the connecting fitting set 1A according to Embodiment (2) is attached to the lower opening edge of the steel pipe 83. The fitting body 20 includes a fitting portion 21 that can be fitted into the lower opening edge of the steel pipe 83, an insertion portion 23 into which the fastening portion 52 of the rod-shaped joint 50 can be inserted, and a fixing portion 26 for fixing the steel pipe 83 to the fitting portion 21 in a state where a pressing force is applied to the steel pipe 83 in a state of being fitted into the fitting portion 21.

[0065] More specifically, the fitting body 20 includes a plate-shaped member 22 having a notch portion 22a having a substantially L shape, and a tubular member 24 constituting the insertion portion 23. With the long side of the notch portion 22a of the plate-shaped member 22 facing one side surface of the tubular member 24, the tip end portion on the short side of the notch portion 22a of the plate-shaped member 22 and one side surface of the tubular member 24 are fixed. A fitting portion 21 having a substantially U shape is formed by the notch portion 22a and one side surface of the tubular member 24. Further, the fitting body 20 includes a reinforcing member 25 fixed to the other side surface opposite to the one side surface of the tubular member 24 to which the plate-shaped member 22 is fixed. The plate-shaped member 22 is made of a steel plate, and the thickness of the steel plate is appropriately set according to specifications such as required strength. The tubular member 24 is composed of a thin steel pipe having a length of about 200 mm to 250 mm, and the reinforcing member 25 is composed of a strip-shaped flat steel having a width substantially the same as the diameter of the tubular member 24 and a length shorter than that of the tubular member 24.

[0066] In the notch portion 22a that constitutes the fitting portion 21, a locking portion 22b that can be locked to an annular protrusion 83a (see FIG. 3) formed on the inner surface of the steel pipe 83 is formed. The locking portions 22b are formed at intervals approximately the same as the intervals of the protrusions 83a of the steel pipe 83. The shape of the locking portion 22b is a sharp triangular shape, but is not limited to this shape, and may be formed in other shapes that can be locked to the protrusions 83a of the steel pipe 83. The notch portion 22a and the locking portion 22b are formed, for example, by laser cutting a steel plate that constitutes the plate-like member 22.

[0067] The fixing portion 26 includes nuts 27 fixed to both side surfaces of the tubular member 24 and both side surfaces of the reinforcing member 25 in a direction parallel to the extension direction of the short side of the notch portion 22a, and set screws 28 that can be screwed into these nuts 27. The nut 27 is fixed in a direction in which the set screw 28 can be screwed in a direction orthogonal to the extension direction of the long side of the notch portion 22a. Note that the number of nuts 27 attached is not particularly limited, but in order to increase the fixing force with the steel pipe 83, it is preferable to provide two or more on both side surfaces of the tubular member 24.

[0068] The set screw 28 is constituted by, for example, a set screw with a hexagonal hole. In order to increase the fixing force with the steel pipe 83, it is preferable to use a set screw with a pointed tip.

[0069] The working procedure for connecting the steel pipe 83 and the reinforcing cage 81 used in the construction of the driven pile using the connecting fitting set 1A according to the embodiment (2) is substantially the same as the working procedure shown in FIG. 3, and thus the description thereof is omitted here.

[0070] According to the connecting fitting set 1A according to the above-described embodiment (2), by using the fitting body 20 including the fitting portion 21, the insertion portion 23, and the fixing portion 26, and the rod-shaped joint 50 (see FIGS. 1 and 2) including the fastening portion 52 and the overlapping portion 55, similar to the connecting fitting set 1 according to the above-described embodiment (1), the work of connecting the steel pipe 83 and the reinforcing cage 81 can be efficiently performed without using welding.

[0071] In addition, the tubular member 24 of the fitting body 20 can be easily attached to the fastening portion 52 (threaded portion 53) of the rod-shaped joint 50. Also, the fitting portion 21 formed by the notch portion 22a having a substantially L-shaped configuration and one side surface of the tubular member 24 can be easily fitted to the lower opening edge portion of the steel pipe 83, thereby enhancing the efficiency of the connection work. Further, the fitting body 20 can be firmly and reliably fixed to the lower opening edge portion of the steel pipe 83 by the nut 27 and the set screw 28 that constitute the fixing portion 26. Also, by using the plate-shaped member 22 having the notch portion 22a with a substantially L-shaped configuration as the fitting body 20, it is possible to reduce the weight and cost of the fitting body 20 as compared with the connection fitting set 1 according to the embodiment (1).

[0072] Since the locking portion 22b is formed in the notch portion 22a of the fitting body 20, it becomes possible to lock the locking portion 22b to the annular protrusion 83a formed on the inner surface of the steel pipe 83, and the fitting body 20 can be more firmly and reliably fixed to the lower opening edge portion of the steel pipe 83, enhancing the effect of preventing displacement of the connected reinforcing cage 81.

[0073] Also, according to the method of connecting the steel pipe 83 and the reinforcing cage 81 using the connection fitting set 1A according to the embodiment (2), by using the connection fitting set 1A including the fitting body 20 having the fitting portion 21, the insertion portion 23, and the fixing portion 26, and the rod-shaped joint 50 having the fastening portion 52 and the overlapping portion 55, the operation of connecting the lower portion of the steel pipe 83 and the upper portion of the reinforcing cage 81 can be efficiently performed without using welding, in the same manner as when using the connection fitting set 1 according to the above-described embodiment (1).

[0074] FIG. 5 is a front view showing a state before assembly of the connection fitting set 1B according to the embodiment (3) of the present invention. FIG. 6 is a right side view of FIG. 5. In the cast-in-place steel pipe concrete pile, in addition to the form in which the lower part of the steel pipe 83 is partially covered and connected to the upper part of the steel cage 81 as shown in FIG. 3, that is, the form having the steel pipe concrete part 84 of the steel pipe non-reinforced concrete structure in which the steel cage 81 is not inserted into the steel pipe 83, there is also a form having the steel pipe concrete part 84 of the steel pipe reinforced concrete structure in which the steel cage 81 is inserted into the steel pipe 83.

[0075] The connecting fitting set 1B according to the embodiment (3) is for connecting the steel pipe 83 and the steel cage 81 used for constructing the cast-in-place steel pipe concrete pile 80 having the steel pipe concrete part 84 of the steel pipe reinforced concrete structure. The connecting fitting set 1B includes a fitting body 30 attached to the upper opening edge of the steel pipe 83 and a rod-shaped joint 60 for connecting the fitting body 30 and the main reinforcement 81a at the upper part of the steel cage 81 inserted into the steel pipe 83.

[0076] The rod-shaped joint 60 includes a fastening part 63 that enables the fitting body 30 to be fastened in accordance with the position of the steel pipe 83 on one end (upper end) side, and a superposition part 66 that can be fixed in a state of being superposed with the main reinforcement 81a of the steel cage 81 on the other end (lower end) side. The superposition part 66 and the main reinforcement 81a of the steel cage 81 can be fixed with a steel bar fixing fitting 70 (see FIG. 7).

[0077] The rod-shaped joint 60 includes a deformed bar steel 61 bent into a shape in which both ends are shifted in parallel according to the difference between the inner diameter of the steel pipe 83 and the cage diameter of the steel cage 81 (also referred to as a reducer shape). A threaded part 61a for screwing a connecting nut 62 is formed on one end (upper end) side of the deformed bar steel 61, and the other end (lower end) side serves as the superposition part 66. The fastening part 63 includes a threaded bar 64 attached to the threaded part 61a on one end side of the deformed bar steel 61 with a connecting nut 62, and a set of nuts consisting of a lower nut 65a and an upper nut 65b for positioning and fastening the fitting body 30 to the threaded bar 64 are configured to be screwable.

[0078] The fitting body 30 includes a fitting portion 31 that can be fitted into the upper opening edge of the steel pipe 83, an insertion portion 33 into which a screw rod 64 constituting a fastening portion 63 of the rod-shaped joint 60 can be inserted, and a fixing portion 36 for fixing the steel pipe 83 to the fitting portion 31 while applying a pressing force to the steel pipe 83 in a state where it is fitted into the fitting portion 31.

[0079] More specifically, the fitting body 30 includes a pair of plate-like members 32 arranged opposite to each other and a tubular member 34 constituting the insertion portion 33, and the fitting portion 31 is constituted by a notch portion 32a having a substantially inverted U shape formed at the opposing positions of the pair of plate-like members 32. A tubular member 34 and a reinforcing plate 35 are provided between these pair of plate-like members 32. The tubular member 34 is disposed parallel to the depth direction of the notch portion 32a and at a position where it can be arranged inside the steel pipe 83. The reinforcing plate 35 is disposed parallel to the depth direction of the notch portion 32a and at a position facing the tubular member 34 through the notch portion 32a. The pair of plate-like members 32 are made of, for example, a steel plate, and the thickness of the steel plate is appropriately set according to specifications such as required strength. The tubular member 34 is constituted by, for example, a thin-walled steel pipe having a length of about 100 mm to 150 mm, and the reinforcing plate 35 is constituted by a flat steel having a strip shape with the same width as the diameter of the tubular member 34. The tubular member 34 and the reinforcing plate 35 are fixed to the pair of plate-like members 32 by, for example, welding.

[0080] In the notch portion 32a constituting the fitting portion 31, a locking portion 32b that can be locked to an annular protrusion 83a (see FIG. 7) formed on the inner surface of the upper opening of the steel pipe 83 is formed. The locking portions 32b are formed at intervals approximately the same as the intervals of the protrusions 83a of the steel pipe 83. The shape of the locking portion 32b is a sharp triangular shape, but it is not limited to this shape and may be formed in other shapes that can be locked to the protrusions 83a of the steel pipe 83. The notch portion 32a and the locking portion 32b are formed, for example, by laser cutting the steel plate constituting the plate-like member 32.

[0081] The fixing part 36 includes a nut 37 fixed to the outer surface of each of the pair of plate-like members 32, and a set screw 38 that can be screwed onto these nuts 37. The nut 37 is fixed in a direction in which the set screw 38 can be screwed in a direction orthogonal to the depth direction of the notch 32a. Note that the number of nuts 37 attached is not particularly limited, but in order to increase the fixing force with the steel pipe 83, it is preferable to provide two or more on the outer surface of each of the pair of plate-like members 32.

[0082] The set screw 38 is constituted by, for example, a set screw with a hexagonal hole. It is preferable to use a set screw 38 with a pointed tip in the shape of a cutting edge.

[0083] Next, with reference to FIG. 7, an example of the working procedure for connecting the steel pipe 83 and the reinforcing cage 81 used for constructing the cast-in-place pile using the connecting fitting set 1B according to the embodiment (3) will be described. In FIG. 7, the case where the upper part of the reinforcing cage 81 and the upper opening edge of the steel pipe 83 are connected in a state where the reinforcing cage 81 is inserted through the steel pipe 83 constituting the steel pipe concrete part at the upper part of the cast-in-place steel pipe concrete pile (the connecting method of the through type) will be described.

[0084] FIG. 7(a) shows a state during the process of building the steel pipe 83 into the casing 88 arranged in the pile hole, supporting the upper part of the steel pipe 83 at the opening of the casing 88 using a receiving jig (not shown), and then building the reinforcing cage 81 into the steel pipe 83.

[0085] As shown in FIG. 7(a), after building the reinforcing cage 81 into the steel pipe 83 until the upper part of the reinforcing cage 81 remains above the steel pipe 83 and suspending the reinforcing cage 81, next, as shown in FIG. 7(b), the overlapping part 66 of the rod-shaped joint 60 is overlapped with the main reinforcement 81a at the upper part of the reinforcing cage 81, and the rod-shaped joint 60 is attached to the main reinforcement 81a with the reinforcing bar fixing fitting 70. At this time, the overlapping part 66 of the rod-shaped joint 60 is arranged in a state of being overlapped on the side of the main reinforcement 81a so as to be located on the circumference formed by a large number of main reinforcements 81a.

[0086] In addition, the overlapping position of the overlapping portion 66 of the rod joint 60 and the main reinforcement 81a of the reinforcing cage 81 is adjusted to a position where the main reinforcement 81a with a predetermined length remains above the steel pipe 83 when the reinforcing cage 81 is further built into the steel pipe 83 in a subsequent process and the threaded rod 64 of the rod joint 60 is positioned at the position of the upper opening edge of the steel pipe 83. Further, a plurality of rod joints 60 are arranged at predetermined intervals on the circumference of the reinforcing cage 81 formed by a large number of main reinforcements 81a. The predetermined interval is appropriately designed in consideration of the size (diameter, outer peripheral length), weight, etc. of the reinforcing cage 81.

[0087] The attachment of the reinforcing bar fixing fitting 70 can be performed in the same manner as the connecting fitting set 1 according to the above-described embodiment (1). However, in this embodiment, at this stage, the main reinforcement 81a and the overlapping portion 66 are firmly fixed with the reinforcing bar fixing fitting 70.

[0088] After fixing the overlapping portion 66 to the main reinforcement 81a with the reinforcing bar fixing fitting 70, a lower nut 65a is screwed onto the threaded rod 64 on one end side of the rod joint 60, and the tubular member 34 of the fitting body 30 is inserted into the threaded rod 64 of the rod joint 60 with the notch portion 32a facing downward, and the fitting body 30 is inserted onto the threaded rod 64 so that the fitting body 30 is supported by the lower nut 65a screwed onto the threaded rod 64 as shown in FIG. 7(c).

[0089] Next, as shown in FIGS. 7(c) and 7(d), the reinforcing cage 81 suspended by a crane or the like is further built into the steel pipe 83 so that the upper opening edge of the steel pipe 83 is fitted into the notch portion 32a of the fitting body 30 inserted into the threaded rod 64 of the rod joint 60.

[0090] Thereafter, while adjusting the height position of the lower nut 65a screwed onto the threaded rod 64 of the rod joint 60, the positioning of the fitting body 30 is performed so that the locking portion 32b formed in the notch portion 32a of the fitting body 30 is locked to the protrusion 83a formed inside the steel pipe 83 as shown in FIGS. 7(e) and 7(f).

[0091] And after the position adjustment of the fitting body 30 by the lower nut 65a is completed, as shown in FIGS. 7(e) and 7(f), the upper nut 65b is screwed onto the threaded rod 64 of the rod-shaped joint 60, and the fitting body 30 is fastened (fixed) to the threaded rod 64 by these upper and lower nuts 65a and 65b. Also, the set screw 38 screwed onto the nut 37 constituting the fixing portion 36 of the fitting body 30 is screwed forward toward the outer peripheral surface of the steel pipe 83, and the outer peripheral surface of the steel pipe 83 is strongly pressed by the tip of the set screw 38, thereby fixing the fitting body 30 and the steel pipe 83.

[0092] After the connection work between the main reinforcement 81a of the reinforcing cage 81 and the steel pipe 83 by all the connecting fitting sets 1B arranged on the circumference of the reinforcing cage 81 is completed, the connected steel pipe 83 and the reinforcing cage 81 are lifted, and after removing the receiving jig (not shown) of the steel pipe 83 arranged at the upper part of the casing, the work of building them into the pile hole is carried out.

[0093] According to the connecting fitting set 1B according to the above-described embodiment (3), by using the fitting body 30 having the fitting portion 31, the insertion portion 33, and the fixing portion 36, and the rod-shaped joint 60 having the fastening portion 63 and the overlapping portion 66, the work of connecting the steel pipe 83 and the reinforcing cage 81 constituting the steel pipe concrete portion of the steel pipe reinforced concrete structure can be efficiently performed without using welding.

[0094] Also, the tubular member 34 of the fitting body 30 can be easily attached to the fastening portion 63 (threaded rod 64) of the rod-shaped joint 60, and the fitting portion 31 formed by the notches 32a formed at the opposing positions of the pair of plate-shaped members 32 can be easily fitted to the upper opening edge portion of the steel pipe 83, thereby improving the efficiency of the connection work. Further, the fitting body 30 can be firmly and reliably fixed to the upper opening edge portion of the steel pipe 83 by the nut 37 and the set screw 38 constituting the fixing portion 36.

[0095] Since the locking portion 32b is formed in the notch 32a of the fitting body 30, it is possible to lock the locking portion 32b to the annular protrusion 83a formed on the inner surface of the steel pipe 83, and the fitting body 30 can be fixed to the upper opening edge of the steel pipe 83 more firmly and reliably, enhancing the effect of preventing displacement of the connected reinforcing cage 81.

[0096] In addition, since the bar-shaped joint 60 is composed of a deformed steel bar 61 bent according to the difference between the inner diameter of the steel pipe 83 and the cage diameter of the reinforcing cage 81, the fastening portion 63 of the bar-shaped joint 60 can be disposed inside the steel pipe 83, and the overlapping portion 66 can be disposed in a state close to the main reinforcement 81a of the reinforcing cage 81 respectively. Moreover, since the fastening portion 63 is composed of a threaded rod 64 attached by a connecting nut 62 to one end side of the deformed steel bar 61, and a pair of upper and lower nuts 65a, 65b can be screwed onto the threaded rod 64, the fastening position of the fitting body 30 inserted into the threaded rod 64 can be easily adjusted by the pair of upper and lower nuts 65a, 65b. In addition, since the overlapping portion 66 of the bar-shaped joint 60 is composed of a deformed steel bar 61, the overlapping portion 66 and the main reinforcement 81a of the reinforcing cage 81 can be firmly fixed by the steel bar fixing fitting 70.

[0097] According to the method of connecting the steel pipe 83 and the reinforcing cage 81 using the connecting fitting set 1B according to the embodiment (3) described with reference to FIG. 7, by using the connecting fitting set 1B including the fitting body 30 having the fitting portion 31, the insertion portion 33, and the fixing portion 36, and the bar-shaped joint 60 having the fastening portion 63 and the overlapping portion 66, the operation of connecting the upper part of the steel pipe 83 and the reinforcing cage 81 that constitute the steel pipe concrete part of the steel pipe reinforced concrete structure can be efficiently performed without using welding.

[0098] In the connecting fitting set 1B according to the above-described embodiment (3), it is also possible to use the bar-shaped joint 50 (see FIGS. 1 and 2) instead of the bar-shaped joint 60. Also, in the connecting fitting sets 1 and 1A according to the above-described embodiments (1) and (2), it is also possible to use the bar-shaped joint 60 (see FIGS. 5 and 6) instead of the bar-shaped joint 50.

[0099] FIG. 8 is a diagram showing a schematic configuration of a fitting body 40 that constitutes a connecting fitting set 1C according to Embodiment (4), where (a) is a front view and (b) is a right side view. In addition, components having the same functions as the fitting body 10 of the connecting fitting set 1 according to Embodiment (1) shown in FIGS. 1 and 2 are denoted by the same reference numerals, and their descriptions are omitted. Also, for the rod-shaped joint that constitutes the connecting fitting set 1C according to Embodiment (4), the rod-shaped joint 50 of the connecting fitting set 1 according to Embodiment (1) can be used, or the rod-shaped joint 60 of the connecting fitting set 1B according to Embodiment (3) can be used. Therefore, the description thereof is omitted here.

[0100] The connecting fitting set 1 according to the above-described Embodiment (1) has a function of attaching the fitting body 10 to the lower opening edge of a steel pipe 83 that constitutes a steel pipe concrete part of a steel pipe reinforced concrete-free structure and connecting the steel pipe 83 and the steel cage 81. Further, the connecting fitting set 1B according to Embodiment (3) has a function of attaching the fitting body 30 to the upper opening edge of a steel pipe 83 that constitutes a steel pipe concrete part of a steel pipe reinforced concrete structure and connecting the steel pipe 83 and the steel cage 81. The connecting fitting set 1C according to Embodiment (4) has both functions of the connecting fitting set 1 according to Embodiment (1) and the connecting fitting set 1B according to Embodiment (3).

[0101] The fitting body 40 includes a pair of plate-shaped members 42 arranged opposite to each other and two tubular members 44 and 45 that constitute an insertion portion 43, and the fitting portion 41 is constituted by a substantially U-shaped notch portion 42a formed at the opposing positions of the pair of plate-shaped members 42. The two tubular members 44 and 45 are disposed between the pair of plate-shaped members 42 in a position parallel to the depth direction of the notch portion 42a and facing each other through the notch portion 42a. The plate-shaped member 42 is made of a steel plate, and the thickness of the steel plate is appropriately set according to specifications such as required strength. The two tubular members 44 and 45 are each composed of a small-diameter steel pipe with a length of about 100 mm to 150 mm. The two tubular members 44 and 45 are fixed to the pair of plate-shaped members 42, for example, by welding. In the notch 42a, a locking portion 42b that can be locked to an annular protrusion 83a formed on the inner surface of the steel pipe 83 is formed.

[0102] The fixing portion 46 includes nuts 47 fixed to the outer surfaces of the pair of plate-shaped members 42, respectively, and set screws 48 that can be screwed onto these nuts 47. The nut 47 is fixed in a direction in which the set screw 48 can be screwed in a direction orthogonal to the depth direction of the notch 42a. Note that the number of nuts 47 attached is not particularly limited, but in order to increase the fixing force with the steel pipe 83, it is preferable to provide two or more on the outer surface of each of the pair of plate-shaped members 42.

[0103] The set screw 48 is composed of, for example, a set screw with a hexagonal hole. In order to increase the fixing force with the steel pipe 83, it is preferable to use a set screw with a pointed tip and a tapered shape.

[0104] In the fitting body 40 constituting the connecting fitting set 1C according to the embodiment (4), the tubular members 44 and 45 are disposed on both sides of the notch 42a of the pair of plate-shaped members 42. Therefore, when the fitting body 40 is attached to the lower opening edge portion of the steel pipe 83 to connect the steel pipe 83 and the reinforcing cage 81 as in the connecting fitting set 1 according to the embodiment (1), the connecting operation can be performed in the same procedure as the operation procedure described with reference to FIG. 3. That is, it can be used with the notch 42a of the fitting body 40 facing upward, and the screw portion 53 (screw rod 64) of the fastening portion 52 (63) of the rod-shaped joint 50 (60) can be inserted into one of the tubular members 44 located outside the steel pipe 83 for use.

[0105] Also, when attaching the fitting body 40 to the upper opening edge of the steel pipe 83 to connect the steel pipe 83 and the steel bar cage 81 as in the connecting fitting set 1B according to the embodiment (3), the connecting operation can be performed in the same procedure as the operation procedure described with reference to FIG. 7. That is, it can be used with the notch 42a of the fitting body 40 facing downward, and the threaded rod 64 (threaded portion 53) of the fastening portion 63 (52) of the rod-shaped joint 60 (50) can be inserted into the other tubular member 45 located inside the steel pipe 83.

[0106] According to the connecting fitting set 1C according to the above-described embodiment (4), since the tubular members 44 and 45 are arranged on both sides of the notch 42a of the fitting body 40, the fitting body 40 can be used when connecting the steel bar cage 81 at the lower part of the steel pipe 83 and when connecting the steel bar cage 81 at the upper part of the steel pipe 83. One type of fitting body 40 can correspond to two types of construction methods, and the versatility can be enhanced. Note that the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, in the above-described embodiment (1), the pair of plate-like members 12 and the tubular member 14 constituting the fitting body 10 are configured as separate members, but they do not necessarily have to be configured as separate members, and the fitting body may be configured by forming the fitting portion 11 and the insertion portion 13 in one member.

Explanation of Reference Numerals

[0107] 1, 1A, 1B, 1C Connecting fitting set 10, 20, 30, 40 Fitting body 11 Fitting portion 12 Pair of plate-like members 12a Notch 12b Locking portion 13 Insertion portion 14 Tubular member 15 Reinforcing plate 16 Fixing portion 17 Nut 18 Set screw 21 Fitting portion 22 Plate-like member 22a Notch 22b Locking part 23 Insertion part 24 Tubular member 25 Reinforcing member 26 Fixing part 27 Nut 28 Set screw 31 Fitting part 32 Pair of plate-like members 32a Notch 32b Locking part 33 Insertion part 34 Tubular member 35 Reinforcing plate 36 Fixing part 37 Nut 38 Set screw 41 Fitting part 42 Pair of plate-like members 42a Notch 42b Locking part 43 Insertion part 44, 45 Tubular members 46 Fixing part 47 Nut 48 Set screw 50 Rod joint 51 Round steel 52 Fastening part 53 Threaded part (thread-cutting part) 54a Lower nut, 54b Upper nut (a set of nuts) 55 Overlapping part 56 Anti-shift rib 60 Rod joint 61 Shaped bar steel (bar steel) 61a Thread-cutting part 62 Connecting nut 63 Fastening part 64 Threaded bar (threaded member) 65a Lower nut, 65b Upper nut (a set of nuts) 66 Overlapping part 70 Rebar fixing fitting 71 U-bolt 72 Plate 73 Nut 80 In-situ bored pile steel pipe concrete pile 81 Steel reinforcement cage 81a Main reinforcement 81b Hoop reinforcement 81c Reinforcement ring 82 Reinforced concrete part 83 Steel pipe 83a Protrusion 84 Steel pipe concrete part 85 Pile head joint (footing) 86 Joint part 87 Pile hole 88 Casing

Claims

1. A connecting fitting set for connecting a steel pipe and a reinforcing cage used for constructing a driven pile, comprising: a fitting body attached to the opening edge of the steel pipe; a rod-shaped joint for connecting the fitting body and the main reinforcement of the reinforcing cage; the rod-shaped joint having: a fastening portion at one end side that enables the fitting body to be fastened in alignment with the position of the steel pipe; a superimposing portion at the other end side that can be fixed in a state of being superimposed on the main reinforcement of the reinforcing cage; the superimposing portion and the main reinforcement of the reinforcing cage being configured to be fixable with a steel bar fixing fitting; the fitting body having: a fitting portion that can be fitted into the opening edge of the steel pipe; an insertion portion into which the fastening portion of the rod-shaped joint can be inserted; and a fixing portion for fixing the steel pipe to the fitting portion in a state where a pressing force is applied to the steel pipe in a state where the steel pipe is fitted into the fitting portion. A connecting fitting set characterized by the above.

2. The fitting body includes a pair of plate-shaped members arranged opposite to each other and a tubular member constituting the insertion portion, the fitting portion is constituted by a notch formed at the opposing position of the pair of plate-shaped members, the tubular member is disposed between the pair of plate-shaped members in parallel with the depth direction of the notch, the fixing portion includes nuts fixed to the outer surfaces of the respective plate-shaped members of the pair of plate-shaped members and set screws that can be screwed into these nuts, The connecting fitting set according to claim 1, characterized in that the nuts are fixed in a direction in which the set screws can be screwed in a direction orthogonal to the depth direction of the notch.

3. The connecting fitting set according to claim 2, characterized in that a locking portion capable of locking to an annular protrusion formed on the inner surface of the steel pipe is formed in the notch.

4. The connecting fitting set according to claim 2, characterized in that the tubular member is disposed on both sides of the notch.

5. The fitting body includes a plate-shaped member having a notch in a substantially L shape and a tubular member constituting the insertion portion, the tip of the short side of the notch of the plate-shaped member and one side surface of the tubular member are fixed in a state where the long side of the notch and one side surface of the tubular member are opposed to each other, the fitting portion is formed by the notch and one side surface of the tubular member, the fixing portion includes nuts fixed to both side surfaces of the tubular member in a direction parallel to the extension direction of the short side of the notch and set screws that can be screwed into these nuts. The connecting fitting set according to claim 1, wherein the nut is fixed in a direction in which the set screw can be screwed in a direction orthogonal to the extending direction of the long side of the notch.

6. The fitting body further includes a reinforcing member fixed to the other side surface opposite to one side surface of the tubular member, The connecting fitting set according to claim 5, wherein the nut is fixed to the tubular member and the reinforcing member.

7. The connecting fitting set according to claim 5, wherein a locking portion capable of locking to an annular protrusion formed on the inner side surface of the steel pipe is formed in the notch.

8. The bar-shaped joint is composed of a steel bar bent according to the difference between the outer diameter or inner diameter of the steel pipe and the cage diameter of the steel bar cage, The fastening portion is composed of a threaded portion in which one end side of the steel bar is threaded, The connecting fitting set according to any one of claims 1 to 7, wherein a pair of nuts for positioning and fastening the fitting body to the threaded portion are configured to be screwable.

9. A displacement prevention bar for preventing displacement of the connection position with the main bars of the steel bar cage is fixed to the other end side of the steel bar serving as the overlapping portion, The connecting fitting set according to claim 8, wherein the overlapping portion and the displacement prevention bar are configured to be fixable to the main bars of the steel bar cage with the steel bar fixing fittings.

10. The bar-shaped joint is configured to include a steel bar bent according to the difference between the outer diameter or inner diameter of the steel pipe and the cage diameter of the steel bar cage, The fastening portion is composed of a threaded member attached to one end side of the steel bar, The connecting fitting set according to any one of claims 1 to 7, wherein a pair of nuts for positioning and fastening the fitting body to the threaded member are configured to be screwable.

11. The steel bar is composed of a deformed steel bar, The connecting fitting set according to claim 10, wherein the overlapping portion, which is the other end side of the steel bar, is configured to be fixable to the main bars of the steel bar cage with the steel bar fixing fittings.

12. A method for connecting a steel pipe and a steel bar cage using the connecting fitting set according to claim 1, comprising: After temporarily receiving the steel bar cage in the casing at the upper part of the pile hole, a step of overlapping the overlapping portion of the bar-shaped joint on the main bars of the steel bar cage and attaching the bar-shaped joint to the main bars with a steel bar fixing fitting; A step of inserting the insertion portion of the fitting body into the fastening portion of the rod-shaped joint attached to the main reinforcement, and temporarily fixing the fitting body to the fastening portion with the fitting portion facing upward; A step of covering the lower part of the steel pipe with the reinforcing cage up to a predetermined fixing position; A step of positioning and fastening the fitting body to the fastening portion with the fitting portion of the fitting body fitted into the lower opening edge portion of the steel pipe; A step of fixing the steel pipe to the fitting portion with a pressing force applied to the steel pipe by the fixing portion of the fitting body, characterized in that the connecting method comprises the steps.

13. A method for connecting a steel pipe and a reinforcing cage using the connecting fitting set according to Claim 1, including a step of temporarily supporting the steel pipe on the casing at the upper part of the pile hole and then building the reinforcing cage into the steel pipe, wherein the building step comprises a step of overlapping the overlapping portion of the rod-shaped joint on the main reinforcement of the reinforcing cage and attaching the rod-shaped joint to the main reinforcement with a metal fitting for fixing the reinforcement; after attaching the rod-shaped joint to the main reinforcement, further building the reinforcing cage into the steel pipe, and when the fastening portion of the rod-shaped joint is located at the upper opening edge portion of the steel pipe, inserting the insertion portion into the fastening portion of the rod-shaped joint with the fitting portion of the fitting body facing downward, and positioning and fastening the fitting body to the fastening portion with the fitting portion fitted into the upper opening edge portion of the steel pipe; a step of fixing the steel pipe to the fitting portion with a pressing force applied to the steel pipe by the fixing portion of the fitting body, characterized in that the connecting method comprises the steps.

Images