Spacer mounting brackets, rebar fixing bracket set, rebar cage, and assembly method for the rebar cage

Abstract

To provide a spacer mounting fitting allowing to surely fit a spacer used for securing a concrete covering thickness, even when an interval between a belt-like member and a tie-hoop forming a reinforcement cage, or between the tie-hoops becomes very narrow due to a large diameter or high density of reinforcement cage bars.SOLUTION: A spacer mounting fitting 10 is used together with a reinforcement fixing fitting 20 for fixing an intersection part of a rod-like bar 2 and a belt-like plate 3. A strip-like plate body 11 having a width equal to or less than a width of the belt-like plate 3 is folded roughly into an L-shape, to form a holding part 11a and a folded piece part 11b to be held in the intersection part. A spacer fitting part 12 is fixed to the vicinity of a bent part 11c of the holding part 11a and the folded piece part 11b.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a spacer mounting fitting, a spacer, a reinforcing bar fixing fitting set, a reinforcing bar cage, and a method for assembling a reinforcing bar cage. More specifically, when the reinforcing bar cage is built into an excavation hole, it relates to a spacer mounting fitting, a spacer, a reinforcing bar fixing fitting set, a reinforcing bar cage, and a method for assembling a reinforcing bar cage that are attached to the reinforcing bar cage to secure a space from the hole wall of the excavation hole.

Background Art

[0002] At a construction site of a structure, in order to increase the seismic resistance strength of the structure, 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 a driven pile. A driven pile is formed by building a reinforcing bar cage assembled in a cylindrical shape into an excavated pile hole, and then driving and solidifying concrete into the pile hole. Depending on differences such as a method of excavating the ground, several construction methods such as an all-casing method, an earth drill method, and a reverse method are known for the construction method using a driven pile.

[0003] Regarding the assembly of the reinforcing bar cage required for constructing a driven pile, conventionally, temporary fixing by welding was often performed. However, in March 2012, "Specifications and Explanations for Road Bridges" (Japan Road Association) was revised, and in the proviso of (1) of "19.8 Fabrication and Installation of Reinforcing Bar Cages", it is stated that "... however, in the assembly of reinforcing bars, welding for maintaining the shape during assembly shall not be performed." In addition, in the explanation, it is stated that "... it is difficult to ensure the construction quality by welding and there is a risk of defects such as a reduction in the cross-section of the reinforcing bar, etc.", and it is stipulated that direct welding shall not be used for the main reinforcing bars which are the main components of the reinforcing bar cage. Therefore, currently, a non-welding method without welding is adopted.

[0004] FIG. 11 is an enlarged perspective view of a main part showing an example of a conventional reinforcing bar cage manufactured by a non-welding method. The reinforcing cage 1 is composed of multiple rod-shaped reinforcing bars (also called main bars) 2, a ring-shaped reinforcing strip plate 3 which is an assembly reinforcing bar, and multiple tie bars (also called hoop bars) 4 which are surrounding bars. The intersections of these rod-shaped reinforcing bars 2 and strip plate 3 are fixed with mounting brackets (non-welded brackets) 5, and the intersections of these rod-shaped reinforcing bars 2 and tie bars 4 are bound together with wire (not shown). In a steel cage 1 manufactured using this welding-free method, the reinforcing strip plate 3 to which the mounting bracket 5 is attached plays an important role in maintaining the shape of the steel cage 1 and ensuring safety during construction. The above-mentioned road bridge design specifications state that "the diameter and arrangement of the reinforcing bars for assembly will vary depending on the size and weight of the steel cage, but it is generally best to arrange reinforcing bars with a diameter of about 22 mm at intervals of 2 to 3 m."

[0005] Furthermore, a reinforcing bar fixing fitting used to fix the intersection of the rod-shaped reinforcing bar 2 and the strip-shaped plate 3 is disclosed, for example, in Patent Document 1 below. Figure 12 is a perspective view showing how the intersection of the reinforcing bars and the strip-shaped plates constituting the reinforcing cage is fixed using the reinforcing bar fixing fitting disclosed in Patent Document 1. Note that only the vicinity of the intersection is shown in Figure 7.

[0006] The rebar fixing fitting 5A is positioned to sandwich the strip-shaped plate 3 in the vertical direction and comprises a rebar gripping portion 6 having a notch 6a for inserting the rebar 2, and a threaded hole plate portion 7 connecting these two rebar gripping portions 6. A threaded hole 7a is formed approximately in the center of the threaded hole plate portion 7 for screwing in a bolt 8 that fastens the intersection of the rebar 2 and the strip-shaped plate 3.

[0007] Furthermore, a bearing 9c, which constitutes the spacer 9 for the reinforcing cage, is fixed to the upper surface of the rod-shaped reinforcing bar gripping portion 6. The spacer 9 for the reinforcing cage has a bowl-shaped head portion 9a and a shaft portion 9b, one end of which is joined to the inside of the head portion 9a, and the shaft portion 9b is inserted into the bearing 9c attached to the reinforcing bar fixing fitting 5A.

[0008] The spacers 9 for the reinforcing cage are attached to at least four of the reinforcing bar fixing brackets 5A that secure one circumference of the strip-shaped plate 3 when the reinforcing cage is erected in the excavation hole, so that the distance between the hole wall of the excavation hole and the outer surface of the reinforcing cage, i.e., the concrete cover thickness, is uniform.

[0009] In addition to the configuration of the reinforced cage spacer 9 described above, spacers with configurations disclosed in the following Patent Documents 2 to 5 are also known for use with reinforced cages. The spacer disclosed in Patent Document 2 is secured by fastening one end of the spacer body to a tie reinforcement and the other end to a main reinforcement with a bolt. The spacer disclosed in Patent Document 3 is fixed by locking one end of the spacer body to a tie reinforcement and fitting the other end to a main reinforcement. The spacer disclosed in Patent Document 4 is equipped with bifurcated metal fittings at both ends of the spacer body, and with these fittings in contact with the main reinforcement bar, a connecting rod and a nut body are attached to these fittings and tightened to secure them to the main reinforcement bar. The spacer fitting disclosed in Patent Document 5 comprises a spacer body made of a rod-shaped reinforcing bar and a fastener including a U-shaped bolt for fixing both ends of the spacer body to the main reinforcing bar.

[0010] [Problems the invention aims to solve] Since the Great Hanshin-Awaji Earthquake, there has been a significant trend towards larger diameters and greater number of reinforcing bars in steel cages year after year. Extra-large diameter main bars such as D51, which were rarely used before, and large diameter stirrups such as D32 and D35 are now being used. Furthermore, the pile length, which was previously limited to the intermediate supporting layer, is now reaching deeper supporting layers. These are all challenging construction conditions that are completely different from those of the era of conventional welding methods.

[0011] Thus, compared to the reinforcement cage arrangements of a few years ago, current reinforcement cages are not only larger in diameter, and the main and stirrups are thicker, but the spacing between the main and stirrups is also very narrow, and the density of the reinforcement has increased so much that past experience is no longer useful, making construction much more difficult.

[0012] As the diameter and density of reinforcement in such reinforcing cages increase, the spacing between stirrups becomes narrower, which inevitably narrows the gap between the reinforcing strip plate 3 and the stirrups 4. When conventional reinforcing bar fixing fittings 5A are used to fix the intersection of the bar-shaped reinforcement 2 and the strip plate 3 in a reinforcing cage with such a narrow gap between the strip plate 3 and the stirrups 4, the stirrups 4 may be positioned so as to block the receiving opening of the bearing 9c fixed to the upper surface of the bar-shaped reinforcement gripping part 6. In that case, there is a problem in that the shaft portion 9b of the reinforcing cage spacer 9 cannot be inserted into the bearing 9c. Furthermore, a problem arose in that spacers, such as those disclosed in the aforementioned Patent Documents 2 to 5, could not be attached to reinforcing cages where the spacing between the stirrups was narrow. [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Patent No. 3914897 [Patent Document 2] Japanese Patent Publication No. 2003-120030 [Patent Document 3] Japanese Patent Publication No. 2003-232034 [Patent Document 4] Japanese Patent Publication No. 2005-002681 [Patent Document 5] Japanese Patent Publication No. 2015-206197 [Overview of the project] Means for solving the problem and their effects

[0014] The present invention has been made in view of the above problems, and aims to provide a spacer mounting bracket, a spacer, a set of reinforcing bar fixing brackets, a reinforcing bar cage, and a method for assembling a reinforcing bar cage that can reliably attach spacers used to ensure the concrete cover thickness, even when the spacing between the strip members constituting the reinforcing bar cage and the stirrups, or the spacing between the stirrups themselves, becomes very narrow due to the increased diameter and density of the reinforcing bar cage arrangement.

[0015] To achieve the above objective, the spacer mounting bracket (1) according to the present invention is a spacer mounting bracket used together with a reinforcing bar fixing bracket that fixes the intersection of a rod-shaped reinforcing bar and a strip-shaped member, A strip-shaped plate having a width less than or equal to the width of the aforementioned strip-shaped member is bent into a substantially L-shape, so that a clamping portion and a folded portion that can be inserted into the intersection are formed. The device is characterized in that a spacer attachment portion is fixed near the bend between the clamping portion and the folded portion.

[0016] According to the above-described spacer mounting bracket (1), a strip-shaped plate having a width less than or equal to the width of the strip-shaped member is bent into a substantially L-shape, forming a clamping portion and a bent portion that can be inserted into the intersection, and a spacer mounting portion is fixed near the bent portion between the clamping portion and the bent portion. Therefore, by clamping the clamping portion into the intersection and tightening the intersection with the rebar fixing fitting, the spacer mounting fitting is fixed to the outside of the strip-shaped member (the side that intersects with the reinforcing bar). At this time, the spacer mounting portion does not protrude above or below the strip-shaped member. Therefore, for example, even when the spacer mounting bracket and the reinforcing bar fixing bracket are used in a reinforcing cage, and the reinforcing bars in the cage are made thicker and denser, resulting in a very narrow gap between the strip-shaped member which is a reinforcing material and the stirrups which are surrounding reinforcement, the spacers used to ensure the concrete cover thickness can be reliably attached to the spacer mounting portion.

[0017] Furthermore, the spacer mounting bracket (2) according to the present invention is, in the spacer mounting bracket (1) described above, The aforementioned spacer mounting portion, The spacer is composed of a pipe material into which the other end of the shaft portion is inserted, the spacer having a dish-shaped head and a shaft portion with one end in the longitudinal direction joined to the inside of the head. The pipe material is characterized in that its central axis is fixed toward the tip of the bent portion.

[0018] According to the above spacer mounting fitting (2), the spacer mounting portion is composed of a pipe member into which the other end side of the shaft portion of the spacer is inserted, and the pipe member is fixed with its central axis directed in the tip direction of the folded piece portion, in other words, in a direction intersecting the bar-shaped reinforcement. Therefore, for example, when the spacer mounting fitting and the reinforcement fixing fitting are used for a steel bar cage or the like, and the reinforcement cage reinforcement is thickened and densified, and the interval between the strip-shaped member as a reinforcing material and the strip reinforcement as a surrounding reinforcement becomes very narrow, even in such a case when building the steel bar cage, etc., the spacer can be attached to the steel bar cage by a simple operation of inserting the shaft portion of the spacer into the pipe member.

[0019] Moreover, the reinforcement fixing fitting set (1) according to the present invention is a reinforcement fixing fitting set including a reinforcement fixing fitting for fixing the intersection of a bar-shaped reinforcement and a strip-shaped member, and the above spacer mounting fitting (1) or (2), wherein the reinforcement fixing fitting has a bar-shaped reinforcement gripping portion that sandwiches the strip-shaped member in the vertical direction and has a notch portion for inserting the bar-shaped reinforcement, and is characterized by including a screw hole plate portion having bolt-screw holes for connecting the two bar-shaped reinforcement gripping portions and tightening the intersection portion with the sandwiching portion of the spacer mounting fitting sandwiched at the intersection portion.

[0020] According to the above reinforcement fixing fitting set (1), when fixing the intersection of the bar-shaped reinforcement and the strip-shaped member, the sandwiching portion of the spacer mounting fitting is sandwiched at the intersection portion at the position where the spacer used to ensure the covering thickness of the concrete is attached, and the spacer mounting portion is arranged at a position adjacent to the bar-shaped reinforcement at the intersection portion. Then, the two rebar gripping portions of the rebar fixing bracket are fitted into the intersection so that they grip the rebar, and the spacer mounting bracket is housed between the two rebar gripping portions, and the screw hole plate portion is set to be located inside the strip-shaped member. Subsequently, a bolt is set in the screw hole plate portion, and the strip-shaped member is tightened with the bolt, thereby fixing the intersection with the spacer mounting bracket sandwiched in between. Therefore, at the intersection where the spacer is attached, the spacer mounting bracket is fixed to the outside of the strip-shaped member, and the spacer mounting portion does not protrude above or below the strip-shaped member. Consequently, even if, for example, the rebar fixing bracket set is used in a rebar cage, and the rebar cage reinforcement is made thicker and denser, resulting in a very narrow gap between the strip-shaped member which is the reinforcing material and the stirrups which are the surrounding reinforcements, the spacer can be reliably attached to the spacer mounting portion.

[0021] Furthermore, the rebar fixing bracket set (2) according to the present invention is a rebar fixing bracket set comprising a rebar fixing bracket for fixing the intersection of a rod-shaped reinforcing bar and a strip-shaped member, and the spacer mounting bracket (1) or (2) described in claim 1 or claim 2, The aforementioned rebar fixing bracket is A metal fitting body is formed by bending a plate-like body into a roughly U-shape so as to straddle the aforementioned rod-shaped reinforcing bar, thereby forming left and right side plate portions and a rod-shaped reinforcing bar gripping portion, with locking pieces formed on the tip sides of the left and right side plate portions, A thick, rectangular plate is bent into a roughly U-shape so as to straddle the locking pieces of the left and right side plates of the metal fitting body, forming left and right folded pieces and a connecting plate, a screw hole for screwing a bolt is formed in the connecting plate, and a pressing member is provided into the screw hole for screwing a retaining bolt. The pressing member is configured to press the strip-shaped member toward the rod-shaped reinforcing bar while the clamping portion of the spacer mounting bracket is clamped at the intersection.

[0022] According to the above-described rebar fixing bracket set (2), when fixing the intersection of the rod-shaped reinforcing bar and the strip-shaped member, the clamping portion of the spacer mounting bracket is inserted into the intersection at the position where a spacer used to ensure the concrete cover thickness is attached, and the spacer mounting portion is positioned adjacent to the rod-shaped reinforcing bar at the intersection. Then, the metal fitting body is fitted into the intersection from the reinforcing bar side so as to grip the reinforcing bar with the reinforcing bar gripping portion of the metal fitting body, the strip-shaped member and the clamping portion are locked to the locking piece, and the bent piece and the spacer attachment portion are positioned outside the reinforcing bar gripping portion. Then, the pressing member, on which the retaining bolt is screwed, is positioned on the inside of the strip-shaped member, straddling the locking pieces of the metal fitting body. Subsequently, by tightening the retaining bolt screwed into the pressing member, the intersecting portion is clamped into the intersecting portion, and the intersecting portion is fixed in place. Therefore, at the intersection where the spacer is attached, the spacer mounting bracket is fixed to the outside of the strip-shaped member, and the spacer mounting portion does not protrude above or below the strip-shaped member. Consequently, even if, for example, the rebar fixing bracket set is used in a rebar cage, and the rebar cage reinforcement is made thicker and denser, resulting in a very narrow gap between the strip-shaped member, which is a reinforcing material, and the stirrups, the spacer can be reliably attached to the spacer mounting portion.

[0023] Furthermore, the reinforcing cage (1) according to the present invention is a reinforcing cage assembled using the reinforcing bar fixing hardware set (1) or (2) described above, Multiple rod-shaped reinforcing bars arranged around a reference axis, substantially parallel to the direction of the reference axis, Inside the plurality of rod-shaped reinforcing bars, reinforcing strip members are arranged at predetermined intervals in the direction of the reference axis, intersecting these rod-shaped reinforcing bars; The system comprises a plurality of stirrups arranged in a circumferential direction substantially perpendicular to the reference axis, intersecting the plurality of rod-shaped reinforcements. The present invention is characterized in that the clamping portion of the spacer mounting bracket is sandwiched between a part of the intersection between the rod-shaped reinforcing bar and the strip-shaped member, and the intersection is tightened by the reinforcing bar fixing bracket.

[0024] According to the above-described reinforcing cage (1), by using the above-described reinforcing bar fixing bracket set (1) or (2), the clamping portion of the spacer mounting bracket is clamped onto a part of the intersection between the rod-shaped reinforcing bar and the strip-shaped member, and the intersection is tightened and fixed by the reinforcing bar fixing bracket. As a result, the spacer mounting bracket is fixed to the outside of the strip-shaped member, and the spacer mounting portion does not protrude above or below the strip-shaped member. Therefore, for example, even if the reinforcing cage arrangement is made larger in diameter and denser, and the gap between the strip-shaped member, which is a reinforcing material, and the stirrups becomes very narrow, the spacers used to secure the concrete cover thickness can be reliably attached to the spacer mounting portion.

[0025] Furthermore, the method for assembling a reinforcing cage according to the present invention (1) is a method for assembling a reinforcing cage using the reinforcing bar fixing hardware set (1) or (2) described above, A step of arranging multiple rod-shaped reinforcing bars around a reference axis, substantially parallel to the direction of the reference axis, The process involves arranging reinforcing strip members at predetermined intervals in the direction of the reference axis, so as to intersect with the aforementioned rod-shaped reinforcing bars, inside the plurality of rod-shaped reinforcing bars, The process involves inserting the clamping portion of the spacer mounting bracket into a part of the intersection between the rod-shaped reinforcing bar and the strip-shaped member, and then tightening the intersection with the reinforcing bar fixing bracket. The method is characterized by including the step of arranging and fixing multiple tie-shaped reinforcing bars in a circumferential direction substantially perpendicular to the reference axis, so as to intersect with the multiple rod-shaped reinforcing bars.

[0026] According to the above-described method of assembling the reinforcing cage (1), the clamping portion of the spacer mounting bracket is inserted into a part of the intersection between the bar-shaped reinforcing bar and the strip-shaped member using the above-described reinforcing bar fixing bracket set (1) or (2), and the intersection is tightened and fixed with the reinforcing bar fixing bracket. As a result, the spacer mounting bracket is fixed to the outside of the strip-shaped member, and the spacer mounting portion does not protrude above or below the strip-shaped member. Therefore, for example, even if the reinforcing cage is made thicker and denser, and the gap between the strip-shaped member, which is a reinforcing material, and the stirrups becomes very narrow, the spacers used to secure the concrete cover thickness can be reliably attached to the spacer mounting portion.

[0027] Furthermore, the spacer (1) according to the present invention is a spacer used together with a reinforcing bar fixing fitting that fixes the intersection of a rod-shaped reinforcing bar and a strip-shaped member, The aforementioned intersection has a clamping portion that can be inserted into it, It comprises a clamping portion and a spacer body portion integrated therewith, The spacer body is characterized by having a bulging portion that extends in one direction.

[0028] According to the above-mentioned spacer (1), since it is equipped with a clamping portion that can be inserted into the intersection, the spacer is fixed to the outside of the strip-shaped member by clamping the clamping portion into the intersection and tightening the intersection with the rebar fixing fitting. Therefore, for example, even when the spacer and the reinforcing bar fixing fittings are used in a reinforcing cage, and the reinforcing bars in the cage are made thicker and denser, resulting in very narrow spacing between the reinforcing strip members and the surrounding stirrups, and between these stirrups themselves, the spacer can be securely attached.

[0029] Furthermore, the spacer (2) according to the present invention is characterized in that, in the spacer (1) above, the clamping portion has the shape of a short piece having a width less than or equal to the width of the strip-shaped member.

[0030] According to the spacer (2) described above, since the clamping portion has a short piece shape with a width less than or equal to the width of the strip-shaped member, the clamping portion can be clamped into the intersection without protruding from the width of the strip-shaped member. Therefore, the spacer does not hinder the tightening work of the intersection with the reinforcing bar fixing fitting, nor does it reduce the tightening strength at the intersection, and the reinforcing bar, the clamping portion, and the strip-shaped member can be firmly fixed at the intersection.

[0031] Furthermore, in the spacer (3) according to the present invention, one end of a strip-shaped plate having a width less than or equal to the width of the strip-shaped member is bent to form the clamping portion, The spacer body is characterized in that the other end of the strip-shaped plate is bent to form the main body portion.

[0032] According to the above-mentioned spacer (3), a strip-shaped plate having a width less than or equal to the width of the strip-shaped member is bent to form the clamping portion and the spacer body portion, so it can be made inexpensively.

[0033] Furthermore, the spacer (4) according to the present invention is one of the above spacers (1) to (3), The clamping portion is characterized by being provided perpendicular to the longitudinal direction of the spacer body.

[0034] According to the above-described spacer (4), since the clamping portion is provided perpendicular to the longitudinal direction of the spacer body, by oriented the clamping portion parallel to the longitudinal direction of the strip-shaped member and clamping it at the intersection, the spacer body can be positioned parallel to the longitudinal direction of the bar-shaped reinforcement. Therefore, the spacer can properly perform its function of ensuring the concrete cover thickness.

[0035] Furthermore, the rebar fixing bracket set (3) according to the present invention is a rebar fixing bracket set comprising a rebar fixing bracket for fixing the intersection of a rod-shaped reinforcing bar and a strip-shaped member, and any of the above spacers (1) to (4), The aforementioned rebar fixing bracket is A rod-shaped reinforcing bar gripping portion is positioned to sandwich the aforementioned strip-shaped member in the vertical direction and has a notch for inserting the rod-shaped reinforcing bar, The present invention is characterized by comprising a screw hole plate portion that connects the two rod-shaped reinforcing bar gripping portions and has a screw hole for screwing a bolt into the intersection portion while the clamping portion of the spacer is clamped in the intersection portion.

[0036] According to the above-described reinforcement fixing hardware set (3), when fixing the intersection of the rod-shaped reinforcement and the strip-shaped member, the clamping portion of the spacer is inserted into the intersection at the position where the spacer used to ensure the concrete cover thickness is attached, and the main body of the spacer is positioned adjacent to the rod-shaped reinforcement at the intersection. Then, the two rebar gripping portions of the rebar fixing fitting are fitted into the intersection so that they grip the rebar, and the clamping portion of the spacer is positioned between the two rebar gripping portions, and the screw hole plate is positioned on the inside of the strip member. After that, a bolt is set in the screw hole plate and the strip member is tightened with the bolt so that the spacer is fixed to the intersection with the clamping portion of the spacer sandwiched in between. Therefore, at the intersection where the spacer is attached, the clamping portion of the spacer is fixed to the outside of the strip-shaped member, and the clamping portion does not protrude above or below the strip-shaped member. Consequently, even if, for example, the rebar fixing bracket set is used in a rebar cage, and the rebar cage reinforcement is made thicker and denser, resulting in very narrow spacing between the strip-shaped member (which is a reinforcing material) and the surrounding stirrups, or between the stirrups themselves, the spacer can be reliably attached.

[0037] Furthermore, the rebar fixing bracket set (4) according to the present invention is a rebar fixing bracket set comprising a rebar fixing bracket for fixing the intersection of a rod-shaped reinforcing bar and a strip-shaped member, and any of the above spacers (1) to (4), The aforementioned rebar fixing bracket is A metal fitting body is formed by bending a plate-like body into a roughly U-shape so as to straddle the aforementioned rod-shaped reinforcing bar, thereby forming left and right side plate portions and a rod-shaped reinforcing bar gripping portion, with locking pieces formed on the tip sides of the left and right side plate portions, A thick, rectangular plate is bent into a roughly U-shape so as to straddle the locking pieces of the left and right side plates of the metal fitting body, forming left and right folded pieces and a connecting plate, a screw hole for screwing a bolt is formed in the connecting plate, and a pressing member is provided into the screw hole for screwing a retaining bolt. The pressing member is configured to press the strip-shaped member toward the rod-shaped reinforcing bar while the clamping portion of the spacer is clamped at the intersection.

[0038] According to the above-described reinforcement fixing hardware set (4), when fixing the intersection of the rod-shaped reinforcement and the strip-shaped member, the clamping portion of the spacer is sandwiched at the intersection where the spacer used to secure the concrete cover thickness is attached, and the main body of the spacer is positioned adjacent to the rod-shaped reinforcement at the intersection. Then, the metal fitting body is fitted into the intersection from the reinforcing bar side so as to grip the reinforcing bar with the reinforcing bar gripping portion of the metal fitting body, the strip-shaped member and the clamping portion are locked to the locking piece, and the bent piece and the spacer body are positioned outside the reinforcing bar gripping portion. Then, the pressing member, on which the retaining bolt is screwed, is positioned on the inside of the strip-shaped member, straddling the locking pieces of the metal fitting body. Subsequently, by tightening the retaining bolt screwed into the pressing member, the intersecting portion is clamped into the intersecting portion, and the intersecting portion is fixed in place. Therefore, at the intersection where the spacer is attached, the clamping portion of the spacer is fixed to the outside of the strip-shaped member, and the clamping portion does not protrude above or below the strip-shaped member. Consequently, even if, for example, the rebar fixing bracket set is used in a rebar cage, and the rebar cage reinforcement is made thicker and denser, resulting in very narrow gaps between the strip-shaped member (which is a reinforcing material) and the stirrups, or between the stirrups themselves, the spacer can be reliably attached.

[0039] Furthermore, the reinforcing cage (2) according to the present invention is a reinforcing cage assembled using the above-mentioned reinforcing metal fitting set (3) or (4), Multiple rod-shaped reinforcing bars arranged around a reference axis, substantially parallel to the direction of the reference axis, Inside the plurality of rod-shaped reinforcing bars, reinforcing strip members are arranged at predetermined intervals in the direction of the reference axis, intersecting these rod-shaped reinforcing bars; The system comprises a plurality of stirrups arranged in a circumferential direction substantially perpendicular to the reference axis, intersecting the plurality of rod-shaped reinforcements. The present invention is characterized in that the clamping portion of the spacer is sandwiched between a part of the intersection of the rod-shaped reinforcing bar and the strip-shaped member, and the intersection is tightened by the reinforcing bar fixing fitting.

[0040] According to the above-described reinforcing cage (2), by using the above-described reinforcing bar fixing bracket set (3) or (4), the clamping portion of the spacer is sandwiched between a part of the intersection between the rod-shaped reinforcing bar and the strip-shaped member, and the intersection is tightened and fixed by the reinforcing bar fixing bracket. As a result, the clamping portion of the spacer is fixed to the outside of the strip-shaped member, and the clamping portion does not protrude above or below the strip-shaped member. Therefore, even if, for example, the reinforcing cage arrangement is made larger in diameter and denser, and the spacing between the strip-shaped member, which is a reinforcing material, and the stirrups, or the spacing between the stirrups themselves, becomes very narrow, the spacers used to ensure the concrete cover thickness can be reliably installed.

[0041] Furthermore, the method for assembling a reinforcing cage according to the present invention (2) is a method for assembling a reinforcing cage using the above-mentioned reinforcing bar fixing hardware set (3) or (4), A step of arranging multiple rod-shaped reinforcing bars around a reference axis, substantially parallel to the direction of the reference axis, The process involves arranging reinforcing strip members at predetermined intervals in the direction of the reference axis, so as to intersect with the aforementioned rod-shaped reinforcing bars, inside the plurality of rod-shaped reinforcing bars, The process involves inserting the clamping portion of the spacer into a part of the intersection between the rod-shaped reinforcing bar and the strip-shaped member, and then tightening the intersection with the reinforcing bar fixing fitting. The method is characterized by including the step of arranging and fixing multiple tie-shaped reinforcing bars in a circumferential direction substantially perpendicular to the reference axis, so as to intersect with the multiple rod-shaped reinforcing bars.

[0042] According to the above-described method for assembling the reinforcing cage (2), the clamping portion of the spacer is inserted into a part of the intersection between the rod-shaped reinforcing bar and the strip-shaped member using the above-described reinforcing bar fixing bracket set (3) or (4), and the intersection is tightened and fixed with the reinforcing bar fixing bracket. As a result, the clamping portion is fixed to the outside of the strip-shaped member, and the clamping portion does not protrude above or below the strip-shaped member. Therefore, even if the reinforcing cage is made thicker and denser, and the spacing between the strip-shaped member, which is a reinforcing material, and the stirrups, or the spacing between the stirrups themselves, becomes very narrow, the spacers used to ensure the concrete cover thickness can be reliably attached. [Brief explanation of the drawing]

[0043] [Figure 1] This is a plan view showing an example of a spacer mounting bracket according to embodiment (1) of the present invention. [Figure 2] This is a plan view showing how to fix the intersection of a bar-shaped reinforcing bar and a strip-shaped plate using a reinforcing bar fixing bracket set including a spacer mounting bracket according to Embodiment (1). [Figure 3]This figure shows how the intersection of a bar-shaped reinforcing bar and a strip-shaped plate is fixed using a reinforcing bar fixing fitting set including a spacer mounting fitting according to Embodiment (2), where (a) is a plan view, (b) is a side view seen from the direction of arrow b in (a), and (c) is a side view seen from the direction of arrow c in (a). [Figure 4] This is a plan view showing an example of a reinforcing cage assembled using a reinforcing bar fixing hardware set including a spacer mounting bracket according to Embodiment (2). [Figure 5] This figure shows how to fix the intersection of a bar-shaped reinforcing bar and a strip-shaped plate using a reinforcing bar fixing fitting set including a spacer mounting fitting according to Embodiment (3), where (a) is a side view and (b) is a bottom view. [Figure 6] This is a perspective view showing an example of a spacer according to embodiment (4). [Figure 7] This figure shows how to fix the intersection of a bar-shaped reinforcing bar and a strip-shaped plate using a reinforcing bar fixing fitting set including a spacer according to embodiment (4), where (a) is a plan view, (b) is a side view seen from the direction of arrow b in (a), and (c) is a side view seen from the direction of arrow c in (a). [Figure 8] This figure shows how to fix the intersection of a bar-shaped reinforcing bar and a strip-shaped plate using a reinforcing bar fixing fitting set including a spacer according to embodiment (5), where (a) is a plan view and (b) is a side view. [Figure 9] This is a perspective view showing an example of a spacer according to another embodiment. [Figure 10] This is a perspective view showing an example of a spacer according to yet another embodiment. [Figure 11] This is an enlarged perspective view of a key part showing an example of a reinforced steel cage reinforced with conventional strip plates. [Figure 12] This is a perspective view showing a configuration in which conventional rebar fixing hardware is used to fix the intersection of the rod-shaped reinforcing bars and the reinforcing strip plates that make up the reinforcing cage. [Modes for carrying out the invention]

[0044] The following describes embodiments of the spacer mounting bracket, spacer, rebar fixing bracket set, rebar cage, and method for assembling the rebar cage according to the present invention, based on the drawings. The embodiments described below are preferred specific examples of the present invention and therefore have various technically preferred limitations. However, the scope of the present invention is not limited to these forms unless otherwise specified in the following description.

[0045] Figure 1 is a plan view showing an example of a spacer mounting bracket according to embodiment (1), and shows the spacer inserted into the spacer mounting bracket. Figure 2 is a plan view showing how the intersection of a bar-shaped reinforcing bar and a strip-shaped plate is fixed using a reinforcing bar fixing bracket set including a spacer mounting bracket according to embodiment (1).

[0046] The spacer mounting bracket 10 shown in Figure 1 is used together with the rebar fixing bracket 20, which fixes the intersection of the bar-shaped reinforcing bar 2 and the strip-shaped plate 3, as shown in Figure 2. The bar-shaped reinforcing bars 2 and the strip-shaped plates 3 are components that make up a reinforcing cage used in the construction of cast-in-place piles and diaphragm walls. The bar-shaped reinforcing bars 2 are made of deformed steel bars with a diameter of approximately 19 mm to 51 mm, for example, and the strip-shaped plates 3 are made of flat steel in the shape of a ring with a thickness of approximately 6 mm to 12 mm. The reinforcing cage also includes ties (also called hoops) which are surrounding reinforcement bars.

[0047] The spacer mounting bracket 10 is constructed by bending a strip-shaped steel plate 11, which has a width less than or equal to the width of the strip-shaped plate 3, into a roughly L-shape, forming a clamping portion 11a and a bent portion 11b that can be inserted into the intersection, and fixing the spacer mounting portion 12 near the bent portion 11c between the clamping portion 11a and the bent portion 11b.

[0048] The spacer mounting portion 12 is made of, for example, a thin, cylindrical pipe material, and its central axis is fixed toward the tip of the bent portion 11b. The spacer mounting portion 12 is fixed to the clamping portion 11a and the bent portion 11b by, for example, welding. The spacer 15 comprises a dish-shaped head 15a and a shaft portion 15b, one end of which is joined to the inside of the head 15a. The other end of the shaft portion 15b of the spacer 15 is inserted into the spacer mounting portion 12.

[0049] The spacer 15 is used to adjust the distance between the inner wall of the excavation hole and the outer circumference of the reinforcing cage to a predetermined set distance when installing the reinforcing cage in the excavation hole. The protruding length of the spacer 15 can be adjusted, for example, by selecting and combining multiple tubular members 15c of different lengths and inserting them into the shaft portion 15b.

[0050] The plate thickness of the plate body 11 constituting the spacer mounting bracket 10 is sufficient as long as it does not deform easily, for example, it is made up of a thickness of about 3 mm to 6 mm. The length of the clamping portion 11a of the plate body 11 is about the same as the width of the bar-shaped reinforcing bar gripping portion 21 of the reinforcing bar fixing bracket 20, and it is preferable that it be slightly longer than the width of the bar-shaped reinforcing bar gripping portion 21 in order to make clamping easier. The length of the bent portion 11b of the plate body 11 is about the same as the diameter of the bar-shaped reinforcing bar 2, and it is preferable that it be slightly longer than the diameter of the bar-shaped reinforcing bar 2 in order to protect the spacer mounting portion 12 and to increase the mounting strength. The length (pipe length) of the spacer mounting portion 12 is a length that takes into account the length of the shaft portion 15b of the spacer 15 (i.e., the concrete cover thickness), and is designed to be, for example, about 5 cm to 10 cm in length.

[0051] The rebar fixing bracket 20 shown in Figure 2 comprises two rod-shaped rebar gripping parts 21 and a threaded hole plate part 22. The two rod-shaped rebar gripping parts 21 are positioned to sandwich the strip-shaped plate 3 in the vertical direction and have notches 21a for inserting the rod-shaped rebar. The threaded hole plate part 22 connects these two rod-shaped rebar gripping parts 21. The threaded hole plate part 22 has a threaded hole 22a for screwing a bolt to tighten the intersection of the rod-shaped rebar 2 and the strip-shaped plate 3 with the clamping part 11a of the spacer mounting bracket 10 sandwiched in between, and a bolt 23 is screwed into the threaded hole 22a. The rebar fixing bracket set includes the rebar fixing bracket 20 and the spacer mounting bracket 10.

[0052] Next, an example of a method for assembling a reinforcing cage using the reinforcing bar fixing hardware set according to embodiment (1) will be described. [A step of arranging multiple rod-shaped reinforcing bars 2 around a reference axis, substantially parallel to the direction of the reference axis.] Main reinforcement support stands (assembly jigs) formed in a roughly semi-circular shape are arranged in parallel at the construction site. The reinforcing bars 2 are secured to the main reinforcement support claws that protrude from these main reinforcement support stands at predetermined intervals, thereby arranging multiple reinforcing bars 2 in a parallel state.

[0053] [A step of arranging strip-shaped plates 3 at predetermined intervals in the direction of the reference axis, so as to intersect with the multiple rod-shaped reinforcing bars 2, inside the rod-shaped reinforcing bars 2.] Next, ring-shaped strip plates 3 are placed in parallel on top of the rod-shaped reinforcing bars 2, which are arranged in a parallel manner. In this state, the strip plates 3 intersect with each of the rod-shaped reinforcing bars 2.

[0054] [A step in which the clamping portion 11a of the spacer mounting bracket 10 is sandwiched between a part of the intersection between the bar-shaped reinforcing bar 2 and the strip-shaped plate 3, and the intersection is tightened with the reinforcing bar fixing bracket 20.] When placing the strip-shaped plate 3 on the reinforcing bar 2, the clamping portion 11a of the spacer mounting bracket 10 is inserted into the intersection of the reinforcing bar 2 and the strip-shaped plate 3, which corresponds to the spacer mounting position. At that time, it is preferable to insert the clamping portion 11a so that the spacer mounting portion 12 of the spacer mounting bracket 10 is in substantially contact with the reinforcing bar 2.

[0055] Subsequently, the intersections of these reinforcing bars 2 and the strip-shaped plate 3 are fixed with reinforcing bar fixing fittings 20. When tightening the intersections with the reinforcing bar fixing fittings 20, the strip-shaped plate 3 is sandwiched vertically between the two reinforcing bar gripping parts 21, and the reinforcing bars 2 are gripped vertically by sandwiching the strip-shaped plate 3 and the spacer mounting fitting 10. At this time, the screw-hole plate portion 22 of the reinforcing bar fixing fitting 20 is set to be located on the inside of the strip-shaped plate 3 (towards the center of the ring shape).

[0056] Next, a bolt 23 is inserted into the screw hole 22a of the screw hole plate portion 22, and then the bolt 23 is rotated to tighten the intersection of the strip plate 3 and the bar-shaped reinforcing bar 2, and the intersection of the strip plate 3, the spacer mounting bracket 10, and the bar-shaped reinforcing bar 2, thereby fixing the intersection of the bar-shaped reinforcing bar 2 and the strip plate 3, and the intersection of the bar-shaped reinforcing bar 2, the spacer mounting bracket 10, and the strip plate 3.

[0057] [A process of arranging and fixing multiple tie-type reinforcements so as to intersect with multiple rod-shaped reinforcements 2 in a circumferential direction approximately perpendicular to the reference axis.] Next, the tie bars, which are the surrounding reinforcement bars, are wrapped around and secured in a crisscross manner around the multiple rod-shaped reinforcement bars 2 fixed to each strip-shaped plate 3. The tie bars may be in close proximity to each strip-shaped plate 3 (in other words, the distance between the tie bars and each strip-shaped plate 3 may be narrow). The arrangement and fixing method of the tie bars can be the same as in the conventional method. For example, the tie bars are wrapped around the rod-shaped reinforcement bars 2 in an external manner and bent, and the intersection of the rod-shaped reinforcement bars 2 and the tie bars is fixed with wire ties or clip fittings (not shown), and then the assembly of the reinforcement cage is completed.

[0058] When installing a reinforcing cage to which the reinforcing bar fixing bracket set according to embodiment (1) is applied into an excavation hole, the shaft portion 15b of the spacer 15 is inserted into the spacer mounting portion 12 of the spacer mounting bracket 10 fixed by the reinforcing bar fixing bracket 20 on each strip plate 3, and the reinforcing cage is lowered into the excavation hole while attaching the spacers 15.

[0059] According to the spacer mounting bracket 10 of embodiment (1), a strip-shaped plate 11 having a width less than or equal to the width of the strip-shaped plate 3 is bent into a substantially L-shape to form a clamping portion 11a and a bent portion 11b, and the spacer mounting portion 12 is fixed near the bent portion 11c of the clamping portion 11a and the bent portion 11b. Therefore, by clamping the clamping portion 11a into the intersection and tightening the intersection with the rebar fixing fitting 20, the spacer mounting fitting 10 is fixed to the outside of the strip plate 3 (the side that intersects with the reinforcing bar 2), and the spacer mounting portion 12 does not protrude above or below the strip plate 3. Therefore, even when the spacer mounting bracket 10 and the rebar fixing bracket 20 are applied to the rebar cage, and the rebar arrangement in the rebar cage is made thicker and denser, resulting in a very narrow gap between the reinforcing strip 3 and the surrounding stirrups, the spacer 15 can be securely attached to the spacer mounting section 12 when the rebar cage is erected.

[0060] Furthermore, the spacer mounting portion 12 of the spacer mounting bracket 10 is made of a pipe material into which the other end of the shaft portion 15b of the spacer 15 is inserted, and the pipe material is fixed with its central axis facing towards the tip of the bent portion 11b, in other words, in a direction approximately perpendicular to the reinforcing bar 2. Therefore, the spacer 15 can be attached to the reinforcing cage with the simple operation of inserting the shaft portion 15b of the spacer 15 into the pipe material.

[0061] Furthermore, according to the rebar fixing hardware set of embodiment (1), when fixing the intersection of the rod-shaped reinforcing bar 2 and the strip-shaped plate 3, the clamping portion 11a of the spacer mounting hardware 10 is clamped at the intersection where the spacer 15 is attached, and the spacer mounting portion 12 is positioned adjacent to the rod-shaped reinforcing bar 2 at the intersection. Then, the two rebar gripping parts 21 of the rebar fixing fitting 20 are fitted into the intersection so that the two rebar gripping parts 21 grip the rebar 2 and the spacer mounting fitting 10 is placed between the two rebar gripping parts 21, and the screw hole plate part 22 is set to be located on the inside of the strip plate 3. After that, a bolt 23 is set in the screw hole plate part 22 and the strip plate 3 is tightened (pressed) with the bolt 23, thereby fixing the intersection with the spacer mounting fitting 10 sandwiched in between. Therefore, at the intersection where the spacer 15 is attached, the spacer mounting bracket 10 is fixed to the outside of the strip plate 3, and the spacer mounting portion 12 does not protrude above or below the strip plate 3. Thus, even when the reinforcement cage is made thicker and denser, and the gap between the reinforcing strip plate 3 and the surrounding reinforcement becomes very narrow, the spacer 15 can be reliably attached to the spacer mounting portion 12 when the reinforcement cage is erected.

[0062] Furthermore, according to the reinforcing cage of embodiment (1), by using a reinforcing bar fixing bracket set including a spacer mounting bracket 10 and a reinforcing bar fixing bracket 20, the clamping portion 11a of the spacer mounting bracket 10 is clamped into a part of the intersection between the bar-shaped reinforcing bar 2 and the strip-shaped plate 3, that is, at the mounting position of the spacer 15, and the intersection is tightened and fixed by the reinforcing bar fixing bracket 20. As a result, the spacer mounting bracket 10 is fixed to the outside of the strip-shaped plate 3, and the spacer mounting portion 12 does not protrude above or below the strip-shaped plate 3. Therefore, for example, even if the reinforcing cage reinforcement is made thicker and denser, and the gap between the strip-shaped plate 3, which is the reinforcing material, and the stirrups becomes very narrow, the spacer 15 can be reliably attached to the spacer mounting portion 12 during construction.

[0063] Furthermore, according to the reinforcing cage assembly method of embodiment (1), a reinforcing bar fixing bracket set including a spacer mounting bracket 10 and a reinforcing bar fixing bracket 20 is used to clamp the clamping portion 11a of the spacer mounting bracket 10 onto a part of the intersection between the bar-shaped reinforcing bar 2 and the strip-shaped plate 3, that is, at the mounting position of the spacer 15, and then the intersection is tightened and fixed with the reinforcing bar fixing bracket 20. As a result, the spacer mounting bracket 10 is fixed to the outside of the strip-shaped plate 3, and the spacer mounting portion 12 does not protrude above or below the strip-shaped plate 3. Therefore, for example, even if the reinforcing cage reinforcement is made thicker and denser, and the distance between the strip-shaped plate 3, which is the reinforcing material, and the stirrups becomes very narrow, it is possible to construct a reinforcing cage in which the spacer 15 can be reliably attached to the spacer mounting portion 12.

[0064] Figure 3 shows an embodiment (2) of fixing the intersection of a bar-shaped reinforcing bar and a strip-shaped plate using a reinforcing bar fixing bracket set including a spacer mounting bracket, where (a) is a plan view, (b) is a side view seen from the direction of arrow b in (a), and (c) is a side view (front view) seen from the direction of arrow c in (a). Components having the same function as the spacer mounting bracket 10 and reinforcing bar fixing bracket 20 shown in Figures 1 and 2 are denoted by the same reference numerals, and their descriptions are omitted.

[0065] The spacer mounting bracket 10A according to embodiment (2) has substantially the same function as the spacer mounting bracket 10 shown in Figures 1 and 2. The spacer mounting bracket 10A is formed by bending a strip-shaped plate 11 having a width less than or equal to the width of the strip-shaped plate 3 into a substantially L-shape, forming a clamping portion 11a and a bent portion 11b that can be sandwiched at the intersection of the rod-shaped reinforcing bar 2 and the strip-shaped plate 3, and a spacer mounting portion 12 made of pipe material is fixed near the bent portion 11c of the clamping portion 11a and the bent portion 11b.

[0066] The rebar fixing bracket 20A, which constitutes the rebar fixing bracket set according to embodiment (2), has the same basic configuration as the rebar fixing bracket 20 shown in Figure 2, except for the shape of the two rod-shaped rebar gripping parts 21A. The notches 21b of the two rod-shaped reinforcing bar gripping portions 21A are provided with a tapered portion 21ba that is inclined toward the screw hole plate portion 22 and a locking portion 21bb that can lock the rod-shaped reinforcing bar 2.

[0067] With the rebar fixing bracket 20A, tapered portions 21ba are provided in the notches 21b of the two rod-shaped rebar gripping portions 21A. Therefore, when attaching the rebar fixing bracket 20A to the intersection of the rod-shaped rebar 2, in which the spacer mounting bracket 10A is sandwiched, and the strip-shaped plate 3, the rod-shaped rebar 2 can be easily gripped into the notches 21b along the tapered portions 21ba. Furthermore, when the bolt 23 is rotated to tighten the intersection, the rod-shaped rebar 2 can be locked into the locking portion 21bb, enabling stronger and more secure fixing.

[0068] The method for assembling a reinforcing cage using the reinforcing bar fixing bracket set according to Embodiment (2) is substantially the same as the method for assembling a reinforcing cage using the reinforcing bar fixing bracket set according to Embodiment (1) described above, so its explanation will be omitted here.

[0069] Figure 4 is a plan view showing an example of a reinforcing cage assembled using a reinforcing bar fixing hardware set including a spacer mounting bracket according to embodiment (2). The reinforcing cage 1A comprises a plurality of rod-shaped reinforcing bars 2 arranged around a reference axis (central axis) L, substantially parallel to the direction of the reference axis L, reinforcing strip-shaped plates 3 arranged inside the plurality of rod-shaped reinforcing bars 2 at predetermined intervals in the direction of the reference axis L and intersecting with these rod-shaped reinforcing bars 2, and a plurality of stirrups (not shown) wound around the plurality of rod-shaped reinforcing bars 2 in a circumferential direction substantially perpendicular to the reference axis L, intersecting with the plurality of rod-shaped reinforcing bars 2. In the reinforcing cage 1A, the clamping portion 11a of the plate 11 of the spacer mounting bracket 10A is sandwiched at some of the intersections (four locations in Figure 4) between the reinforcing bars 2 and the strip plates 3, and the intersections between the reinforcing bars 2, the strip plates 3 and the spacer mounting bracket 10A are tightened by the reinforcing bar fixing bracket 20A. The remaining intersections between the reinforcing bars 2 and the strip plates 3 are also tightened by the reinforcing bar fixing bracket 20A.

[0070] Then, when installing the reinforcing cage 1A to which the reinforcing bar fixing bracket set according to embodiment (2) is applied into the excavation hole, the shaft portion 15b of the spacer 15 is inserted into the spacer mounting portion 12 of the spacer mounting bracket 10A fixed by the reinforcing bar fixing bracket 20A on each strip plate 3, and the reinforcing cage is lowered into the excavation hole while attaching the spacer 15.

[0071] According to the spacer mounting bracket 10A of the above embodiment (2), the same effects as the spacer mounting bracket 10 of the above embodiment (1) can be obtained. Furthermore, the rebar fixing bracket set according to embodiment (2) provides the same effects as the rebar fixing bracket set according to embodiment (1) described above. In addition, by using the rebar fixing bracket 20A, it becomes easier to attach it to the intersection, and it becomes possible to grip the reinforcing bar 2 more firmly when fixing the intersection.

[0072] Furthermore, according to the reinforced concrete cage 1A of embodiment (2) described above, the same effects as those of the reinforced concrete cage of embodiment (1) described above can be obtained. Furthermore, the method for assembling the reinforcing cage according to embodiment (2) described above can be obtained to achieve the same effects as the method for erecting the reinforcing cage according to embodiment (1) described above.

[0073] Figure 5 shows an embodiment (3) of fixing the intersection of a bar-shaped reinforcing bar and a strip-shaped plate using a reinforcing bar fixing bracket set including a spacer mounting bracket, where (a) is a side view and (b) is a bottom view. Components having the same function as the spacer mounting bracket 10 shown in Figures 1 and 2 are denoted by the same reference numerals, and their descriptions are omitted.

[0074] The spacer mounting bracket 10B according to embodiment (3) has the same function as the spacer mounting bracket 10 shown in Figures 1 and 2. The spacer mounting bracket 10B is formed by bending a strip-shaped plate 11 having a width less than or equal to the width of the strip-shaped plate 3 into a substantially L-shape, forming a clamping portion 11a and a bent portion 11b that can be sandwiched at the intersection of the rod-shaped reinforcing bar 2 and the strip-shaped plate 3, and a spacer mounting portion 12 made of pipe material is fixed near the bent portion 11c of the clamping portion 11a and the bent portion 11b.

[0075] The rebar fixing fitting 30 included in the rebar fixing fitting set according to embodiment (3) is composed of a fitting body 31 and a pressing member 32. The metal fitting body 31 is formed by bending a steel plate-like body into a roughly U-shape so as to straddle the rod-shaped reinforcing bar 2, forming left and right side plate portions 31a and a rod-shaped reinforcing bar gripping portion 31b, with locking pieces 31c formed on the tip sides of the left and right side plate portions 31a.

[0076] The locking piece 31c is formed by a notch 31ca created by cutting out a substantially concave shape from one side edge of the left and right side plate portions 31a. The rod-shaped reinforcing bar gripping portion 31b is formed by adjusting the length of the plate-like body so that it can grip the rod-shaped reinforcing bar 2, taking into consideration the outermost diameter dimension of the rod-shaped reinforcing bar 2, and the intersection of the rod-shaped reinforcing bar 2 and the strip-like plate 3 is located in the notch 31ca.

[0077] The pressing member 32 is positioned across the locking pieces 31c of the left and right side plate portions 31a of the metal fitting body 31. A thick, rectangular steel plate is bent into a roughly U-shape so as to face the strip-shaped plate 3 within the notched portion 31ca, forming left and right folded portions 32a and a connecting plate portion 32b. A screw hole 32c for bolt threading is formed in the connecting plate portion 32b, and a pressing bolt 33 for pressing the strip-shaped plate 3 toward the reinforcing bar 2 is screwed into the screw hole 32c.

[0078] Next, an example of a method for assembling a reinforcing cage using the reinforcing bar fixing hardware set according to embodiment (3) will be described. Note that the steps of arranging a plurality of rod-shaped reinforcing bars 2 around a reference axis substantially parallel to the direction of the reference axis, arranging strip-shaped plates 3 inside the plurality of rod-shaped reinforcing bars 2 at predetermined intervals in the direction of the reference axis so as to intersect with these rod-shaped reinforcing bars 2, and arranging and fixing a plurality of stirrups in a circumferential direction substantially perpendicular to the reference axis so as to intersect with the plurality of rod-shaped reinforcing bars 2 are the same as in the method for assembling a reinforcing cage using the reinforcing bar fixing hardware set according to embodiment (1) described above, so their explanation will be omitted here.

[0079] [A step in which the clamping portion 11a of the spacer mounting bracket 10B is inserted into a part of the intersection between the rod-shaped reinforcing bar 2 and the strip-shaped plate 3, and the intersection is tightened with the reinforcing bar fixing bracket 30.] When placing the strip-shaped plate 3 on top of the reinforcing bar 2, the clamping portion 11a of the spacer mounting bracket 10B is inserted between the reinforcing bar 2 and the strip-shaped plate 3 at the spacer mounting position. At this time, a gap is provided between the spacer mounting portion 12 of the spacer mounting bracket 10B and the reinforcing bar 2, allowing the reinforcing bar gripping portion 31b of the metal fitting body 31 of the reinforcing bar fixing bracket 30 to be inserted.

[0080] Subsequently, the intersections of these reinforcing bars 2 and strip plates 3 are fixed with reinforcing bar fixing brackets 30. When tightening the intersection with the rebar fixing fitting 30, first, the fitting body 31 is straddled onto the rebar 2 from the outside of the rebar cage (the side with the rebar 2), the rebar 2 is fitted into the rebar gripping portion 31b of the fitting body 31, and the strip plate 3 and the clamping portion 11a of the spacer mounting fitting 10B are positioned within the notches 31ca of the left and right side plate portions 31a of the fitting body 31, and the strip plate 3 and the plate body 11 of the spacer mounting fitting 10B are set in contact with the bottom edge of the notch 31ca.

[0081] Next, the pressing member 32, into which the retaining bolt 33 is screwed, is placed across the locking pieces 31c of the metal fitting body 31. That is, the left and right folded pieces 32a of the pressing member 32 are locked to the locking pieces 31c, and the connecting plate portion 32b of the pressing member 32 is placed across the notch portion 31ca so that it faces the strip-shaped plate 3. Subsequently, the retaining bolt 33 is rotated and tightened while the tip surface of the retaining bolt 33 is pressed against the strip-shaped plate 3, thereby pressing the strip-shaped plate 3 towards the reinforcing bar 2, pressing the clamping portion 11a of the spacer mounting bracket 10B towards the reinforcing bar 2, and pressing the reinforcing bar 2 against the inner surface of the reinforcing bar gripping portion 31b, thereby fixing the intersection of the reinforcing bar 2, the spacer mounting bracket 10B, and the strip-shaped plate 3.

[0082] When installing a reinforcing cage to which the reinforcing bar fixing bracket set according to embodiment (3) is applied into an excavation hole, the shaft portion 15b of the spacer 15 is inserted into the spacer mounting portion 12 of the spacer mounting bracket 10B fixed by the reinforcing bar fixing bracket 30 on each strip plate 3, and the reinforcing cage is lowered into the excavation hole while attaching the spacer 15.

[0083] According to the spacer mounting bracket 10B of embodiment (3), the same effects as the spacer mounting bracket 10 of embodiment (1) described above can be obtained. Furthermore, according to the rebar fixing hardware set of embodiment (3), when fixing the intersection of the rod-shaped reinforcing bar 2 and the strip-shaped plate 3, the clamping portion 11a of the spacer mounting hardware 10B is clamped at the intersection where the spacer 15 is attached, and the spacer mounting portion 12 is positioned adjacent to the rod-shaped reinforcing bar 2 at the intersection.

[0084] Then, the metal fitting body 31 of the reinforcing bar fixing fitting 30 is fitted into the intersection from the reinforcing bar 2 side so that the reinforcing bar 2 is gripped by the reinforcing bar gripping portion 31b of the fitting body 31, the strip plate 3 and the clamping portion 11a are locked to the locking piece 31c, and the bent piece 11b and the spacer attachment portion 12 are positioned adjacent to the outside of the reinforcing bar gripping portion 31b. Furthermore, the pressing member 32, into which the retaining bolt 33 is screwed, is positioned on the inside of the strip-shaped plate 3, straddling the locking pieces 31c of the metal fitting body 31. Subsequently, by tightening the retaining bolt 33 screwed into the pressing member 32, the intersecting portion 11a is clamped into the intersecting portion, and the intersecting portion is fixed in place.

[0085] Therefore, at the intersection where the spacer 15 is attached, the spacer mounting bracket 10B is fixed to the outside of the strip plate 3, and the spacer mounting portion 12 does not protrude above or below the strip plate 3. Thus, even when the reinforcement cage is made thicker and denser, and the gap between the reinforcing strip plate 3 and the surrounding reinforcement becomes very narrow, the spacer 15 can be reliably attached to the spacer mounting portion 12 when the reinforcement cage is erected. Furthermore, since the rebar fixing fittings 30 are used, this method can also be applied to rebar cages in which L-shaped angle rings are used as strip members instead of the strip plates 3.

[0086] Furthermore, the reinforcing cage according to embodiment (3) above can be made to have the same effects as the reinforcing cage according to embodiment (1) above. Also, the assembly method of the reinforcing cage according to embodiment (3) above can be made to have the same effects as the installation method of the reinforcing cage according to embodiment (1) above.

[0087] Figure 6 is a perspective view showing an example of a spacer according to embodiment (4). Figure 7 shows an embodiment (4) of fixing the intersection of a bar-shaped reinforcing bar and a strip-shaped plate using a reinforcing bar fixing bracket set including a spacer, where (a) is a plan view, (b) is a side view seen from the direction of arrow b in (a), and (c) is a side view (front view) seen from the direction of arrow c in (a). Note that the reinforcing bar fixing bracket 20A is the same as that shown in Figure 3, so the same reference numerals are used for each component and their descriptions are omitted.

[0088] The spacer 40 shown in Figures 6 and 7 is used together with the rebar fixing fitting 20A that fixes the intersection of the bar-shaped reinforcing bar 2 and the strip-shaped plate 3, as shown in Figure 7. The spacer 40 is formed by bending a strip-shaped steel plate having a width less than or equal to the width of the strip-shaped plate 3, and comprises a clamping portion 41 that can be inserted into the intersection, and a spacer body portion 42 integrated with the clamping portion 41. The thickness of the plate constituting the spacer 40 does not need to be any thickness that does not deform easily, for example, it is made of a thickness of about 3 mm to 6 mm.

[0089] The clamping portion 41 is formed by bending one end of the plate body into a roughly L-shape, creating a short piece shape. The length of the clamping portion 41 is, for example, about the same as the width of the reinforcing bar gripping portion 21A of the reinforcing bar fixing fitting 20A, and is at least longer than the diameter of the reinforcing bar 2.

[0090] The spacer body 42 is equipped with a bulging portion 42a that protrudes in one direction (approximately a handle shape). The bulging portion 42a has an approximately trapezoidal shape when viewed from the side, but any shape that protrudes in one direction is acceptable, such as a semicircular shape or a U-shape. The height of the protruding shape of the bulging portion 42a can be appropriately set according to the concrete cover thickness. The rising portion of the spacer body 42 from the clamping portion 41 is formed by bending the plate body diagonally.

[0091] Furthermore, a locking portion 42b for locking onto the stirrups 4 is formed at the end of the spacer body portion 42 (the other end of the plate body). The locking portion 42b is formed in a hook shape, but the shape of the locking portion 42b is not limited to this. The locking portion 42b may be in other forms that can lock onto the stirrups 4, or it may be in a form that can lock onto the main reinforcement 2, for example, a bifurcated shape that straddles the main reinforcement 2. Locking onto the main reinforcement 2 may be done, for example, by fixing the bifurcated locking piece with a fastener, or by fitting the bifurcated leaf spring piece onto the main reinforcement 2. In addition, in another configuration, the locking portion 42b may not be provided. Note that the length of the rising piece on the clamping portion 41 side of the spacer body portion 42 is approximately the diameter of the main reinforcement longer than the length of the rising piece on the locking portion 42b side. Furthermore, although the angle between the clamping portion 41 and the spacer body portion 42 is approximately 90 degrees, the angle is not limited to this angle. The angle may be set to less than 90 degrees, for example, 50 degrees or more but less than 90 degrees, or 60 degrees or more but 80 degrees or less, and is particularly suitable when the locking portion 42b is to be able to lock onto the main reinforcement. Also, the angle may be 90 degrees or more.

[0092] Next, an example of a method for assembling a reinforcing cage using the reinforcing bar fixing hardware set according to embodiment (4) will be described. Note that the steps of arranging a plurality of rod-shaped reinforcing bars 2 around a reference axis substantially parallel to the direction of the reference axis, and arranging strip-shaped plates 3 inside the plurality of rod-shaped reinforcing bars 2 at predetermined intervals in the direction of the reference axis so as to intersect with these rod-shaped reinforcing bars 2, are the same as in the method for assembling a reinforcing cage using the reinforcing bar fixing hardware set according to embodiment (1) described above, so their explanation will be omitted here.

[0093] [A step in which the intersecting portion 41 of the spacer 40 is inserted into a part of the intersection between the bar-shaped reinforcing bar 2 and the strip-shaped plate 3, and the intersection is tightened with the reinforcing bar fixing fitting 20A.] When placing the strip-shaped plate 3 on the reinforcing bar 2, the clamping portion 41 of the spacer 40 is inserted at the intersection of the reinforcing bar 2 and the strip-shaped plate 3, which corresponds to the spacer mounting position. At that time, it is preferable to insert the clamping portion 41 so that the spacer body portion 42 of the spacer 40 is in substantially contact with the reinforcing bar 2.

[0094] Subsequently, the intersections of these reinforcing bars 2 and the strip-shaped plate 3 are fixed with reinforcing bar fixing brackets 20A. When tightening the intersections with the reinforcing bar fixing brackets 20A, the two reinforcing bar gripping parts 21A are positioned to grip the strip-shaped plate 3 in the vertical direction, and the clamping part 41 of the strip-shaped plate 3 and the spacer 40 is positioned to grip the reinforcing bars 2 in the vertical direction. At this time, the screw-hole plate part 22 of the reinforcing bar fixing bracket 20A is set to be located on the inside of the strip-shaped plate 3 (towards the center of the ring shape).

[0095] Next, a bolt 23 is inserted into the screw hole 22a of the screw hole plate portion 22, and then the bolt 23 is rotated to tighten the intersection of the strip plate 3 and the rod-shaped reinforcing bar 2, and the intersection of the strip plate 3 and the spacer 40 sandwich portion 41 and the rod-shaped reinforcing bar 2, thereby fixing the intersection of the rod-shaped reinforcing bar 2 and the strip plate 3, and the intersection of the rod-shaped reinforcing bar 2 and the spacer 40 sandwich portion 41 and the strip plate 3.

[0096] [A process of arranging and fixing multiple tie-type reinforcements so as to intersect with multiple rod-shaped reinforcements 2 in a circumferential direction approximately perpendicular to the reference axis.] Next, the stirrups 4, which are the surrounding reinforcement bars, are wrapped around the multiple rod-shaped reinforcement bars 2 fixed to each strip-shaped plate 3 in a crisscross manner and fixed, and the locking portion 42b of the spacer 40 is locked to the stirrups 4. Note that the stirrups 4 may be in close proximity to each strip-shaped plate 3 (in other words, the distance between the stirrups 4 and each strip-shaped plate 3 may be narrow). The arrangement and fixing method of the stirrups 4 can be the same as in the conventional method. For example, the stirrups 4 are wrapped around the rod-shaped reinforcement bars 2 in an external manner and bent, and the intersection of the rod-shaped reinforcement bars 2 and the stirrups 4 is fixed with wire ties or clip fittings (not shown), and then the assembly of the reinforcement cage is completed.

[0097] According to the spacer 40 of embodiment (4), since it is equipped with a clamping portion 41 that can be sandwiched between the bar-shaped reinforcing bar 2 and the strip-shaped plate 3, the spacer 40 is fixed to the outside of the strip-shaped plate 3 by tightening the intersection with the reinforcing bar fixing fitting 20A while the clamping portion 41 is sandwiched between the bar-shaped reinforcing bar 2. Therefore, even when the spacer 40 and the rebar fixing fitting 20A are used in a rebar cage, and the rebar arrangement in the rebar cage is made thicker and denser, resulting in very narrow spacing between the reinforcing strip 3 and the surrounding stirrups 4, and between these stirrups themselves, the spacer 40 can be reliably and easily attached.

[0098] Furthermore, with respect to the spacer 40, since the clamping portion 41 has a short piece shape with a width less than or equal to the width of the strip-shaped plate 3, the clamping portion 41 can be clamped into the intersection without protruding beyond the width of the strip-shaped plate 3. Therefore, the spacer 40 does not hinder the tightening work at the intersection with the reinforcing bar fixing fitting 20A, nor does it reduce the tightening strength at the intersection, and the reinforcing bar 2, the clamping portion 41, and the strip-shaped plate 3 can be firmly fixed at the intersection.

[0099] Furthermore, since the spacer 40 is made by bending a strip-shaped plate having a width less than or equal to the width of the strip-shaped plate 3 to form a clamping portion 41 and a spacer body portion 42, it can be made inexpensively.

[0100] Furthermore, with respect to the spacer 40, since the clamping portion 41 is provided perpendicular to the longitudinal direction of the spacer body portion 42, by oriented the clamping portion 41 parallel to the longitudinal direction of the strip plate 3 and clamping it at the intersection, the spacer body portion 42 can be positioned parallel to the longitudinal direction of the reinforcing bar 2. Therefore, the spacer can properly perform its function of ensuring the concrete cover thickness.

[0101] Furthermore, according to the rebar fixing hardware set of embodiment (4), when fixing the intersection of the rod-shaped reinforcing bar 2 and the strip-shaped plate 3, the clamping portion 41 of the spacer 40 is sandwiched at the intersection where the spacer 4 for securing the concrete cover thickness is attached, and the spacer body portion 42 is positioned adjacent to the rod-shaped reinforcing bar 2 at the intersection. Then, the two rebar gripping portions 21A of the rebar fixing fitting 20A are fitted into the intersection so that the two rebar gripping portions 21A grip the rebar 2 and the clamping portion 41 of the spacer 40 is accommodated between the two rebar gripping portions 21A, and the screw hole plate portion 22 is set to be located on the inside of the strip plate 3. After that, a bolt 23 is set in the screw hole plate portion 22 and the strip plate 3 is tightened with the bolt 23, thereby fixing the spacer 40 to the intersection with the clamping portion 41 of the spacer 40 sandwiched in the intersection.

[0102] Therefore, at the intersection where the spacer 40 is attached, the clamping portion 41 of the spacer 40 is fixed to the outside of the strip plate 3, and the clamping portion 41 does not protrude above or below the strip plate 3. Consequently, even when this rebar fixing bracket set is used in a rebar cage, and the rebar cage reinforcement is made thicker and denser, resulting in very narrow gaps between the reinforcing strip plate 3 and the surrounding reinforcement (stirring bars 4), and between the stirrups 4 themselves, the spacer 40 can be attached reliably and easily.

[0103] Furthermore, in the reinforcing cage using the reinforcing bar fixing bracket set according to embodiment (4), by using the reinforcing bar fixing bracket set which includes the spacer 40 and the reinforcing bar fixing bracket 20A, the clamping portion 41 of the spacer 40 is sandwiched in a part of the intersection between the bar-shaped reinforcing bar 2 and the strip-shaped plate 3, and the intersection is tightened and fixed by the reinforcing bar fixing bracket 20A. As a result, the clamping portion 41 of the spacer 40 is fixed to the outside of the strip-shaped plate 3, and the clamping portion 41 does not protrude above or below the strip-shaped plate 3. Therefore, even when the reinforcing cage reinforcement is made thicker and denser, and the spacing between the reinforcing strip-shaped plate 3 and the stirrups 4, or between the stirrups themselves, becomes very narrow, the spacer 40 can be reliably attached.

[0104] Furthermore, according to the reinforcing cage assembly method of the embodiment, a reinforcing cage fixing bracket set including a spacer 40 and a reinforcing bar fixing bracket 20A is used to clamp the clamping portion 41 of the spacer 40 into a part of the intersection between the rod-shaped reinforcing bar 2 and the strip-shaped plate 3, and the intersection is tightened and fixed with the reinforcing bar fixing bracket 20A. As a result, the clamping portion 41 is fixed to the outside of the strip-shaped plate 3, and the clamping portion 41 does not protrude above or below the strip-shaped plate 3. Therefore, even when the reinforcing cage reinforcement is made thicker and denser, and the spacing between the reinforcing strip-shaped plate 3 and the stirrups 4, or between the stirrups themselves, becomes very narrow, the spacer 40 can be reliably and easily attached.

[0105] Figure 8 shows an embodiment (5) of fixing the intersection of a bar-shaped reinforcing bar and a strip-shaped plate using a reinforcing bar fixing fitting set including a spacer, where (a) is a plan view and (b) is a side view. The reinforcement fixing bracket set including a spacer according to embodiment (5) comprises a spacer 40A and a reinforcement fixing bracket 30. Since spacer 40A is substantially the same as spacer 40 shown in Figures 6 and 7, the same reference numerals are used for each component, and their descriptions are omitted. Similarly, since rebar fixing bracket 30 is substantially the same as that shown in Figure 5, the same reference numerals are used for each component, and their descriptions are omitted.

[0106] The spacer 40A according to embodiment (5) is formed by bending a strip-shaped steel plate having a width less than or equal to the width of the strip-shaped plate 3, and comprises a clamping portion 41 that can be sandwiched at the intersection of the rod-shaped reinforcing bar 2 and the strip-shaped plate 3, and a spacer body portion 42 integrated with the clamping portion 41. The clamping portion 41 is formed by bending one end of the plate into an L-shape to create a short piece shape. The spacer body portion 42 has a bulging portion 42a that protrudes in one direction (approximately a handle shape), and a locking portion 42b is formed at its end for locking onto the tie reinforcing bar 4. In another configuration, the locking portion 42b may be configured to lock onto the main reinforcing bar 2.

[0107] Next, an example of a method for assembling a reinforcing cage using the reinforcing bar fixing hardware set according to embodiment (5) will be described. Note that the steps of arranging a plurality of rod-shaped reinforcing bars 2 around a reference axis substantially parallel to the direction of the reference axis, and arranging strip-shaped plates 3 inside the plurality of rod-shaped reinforcing bars 2 at predetermined intervals in the direction of the reference axis so as to intersect with these rod-shaped reinforcing bars 2, are the same as in the method for assembling a reinforcing cage using the reinforcing bar fixing hardware set according to embodiment (1) described above, so their explanation will be omitted here.

[0108] [A step in which the intersecting portion 41 of the spacer 40A is inserted into a part of the intersection between the bar-shaped reinforcing bar 2 and the strip-shaped plate 3, and the intersection is tightened with the reinforcing bar fixing fitting 30.] When placing the strip-shaped plate 3 on top of the reinforcing bar 2, the clamping portion 41 of the spacer 40A is inserted between the reinforcing bar 2 and the strip-shaped plate 3 at the spacer mounting position. At this time, a gap is provided between the spacer body portion 42 of the spacer 40 and the reinforcing bar 2, allowing the reinforcing bar gripping portion 31b of the metal fitting body 31 of the reinforcing bar fixing fitting 30 to be inserted.

[0109] Subsequently, the intersections of these reinforcing bars 2 and strip plates 3 are fixed with reinforcing bar fixing brackets 30. When tightening the intersection with the rebar fixing fitting 30, first, the fitting body 31 is straddled onto the rebar 2 from the outside of the rebar cage (the side with the rebar 2), the rebar 2 is fitted into the rebar gripping portion 31b of the fitting body 31, and the strip plate 3 and the clamping portion 41 of the spacer 40A are positioned within the notches 31ca of the left and right side plate portions 31a of the fitting body 31, and the strip plate 3 and the clamping portion 41 of the spacer 40 are set in contact with the bottom edge of the notch 31ca.

[0110] Next, the pressing member 32, into which the retaining bolt 33 is screwed, is placed across the locking pieces 31c of the metal fitting body 31. That is, the left and right folded pieces 32a of the pressing member 32 are locked to the locking pieces 31c, and the connecting plate portion 32b of the pressing member 32 is placed across the notch portion 31ca so that it faces the strip-shaped plate 3. Subsequently, the retaining bolt 33 is rotated and tightened while the tip surface of the retaining bolt 33 is pressed against the strip-shaped plate 3, thereby pressing the strip-shaped plate 3 towards the reinforcing bar 2, pressing the clamping portion 41 of the spacer 40A towards the reinforcing bar 2, and pressing the reinforcing bar 2 against the inner surface of the reinforcing bar gripping portion 31b, thereby fixing the intersection of the reinforcing bar 2, the spacer 40A, and the strip-shaped plate 3.

[0111] [A process of arranging and fixing multiple tie-type reinforcements so as to intersect with multiple rod-shaped reinforcements 2 in a circumferential direction approximately perpendicular to the reference axis.] Next, the stirrups, which are the surrounding reinforcement bars, are wrapped around the multiple rod-shaped reinforcement bars 2 fixed to each strip-shaped plate 3 in a crisscross manner and fixed, and the locking portion 42b of the spacer 40A is locked to the stirrups 4. Note that the stirrups may be in close proximity to each strip-shaped plate 3 (in other words, the distance between the stirrups and each strip-shaped plate 3 may be narrow). The arrangement and fixing method of the stirrups can be carried out in the same way as in the conventional method. For example, the stirrups are wrapped around the rod-shaped reinforcement bars 2 in an external manner and bent, and the intersection of the rod-shaped reinforcement bars 2 and the stirrups is fixed with wire ties or clip fittings (not shown), and then the assembly of the reinforcement cage is completed.

[0112] According to the spacer 40A of embodiment (5), the same effects as the spacer 40 of embodiment (4) described above can be obtained. Furthermore, according to the rebar fixing hardware set of embodiment (5), when fixing the intersection of the rod-shaped reinforcing bar 2 and the strip-shaped plate 3, the clamping portion 41 of the spacer 40A is sandwiched at the intersection where the spacer 40A is attached, and the spacer body portion 42 is positioned adjacent to the rod-shaped reinforcing bar 2 at the intersection. Then, the metal fitting body 31 of the reinforcing bar fixing fitting 30 is fitted into the intersection from the reinforcing bar 2 side so that the reinforcing bar 2 is gripped by the reinforcing bar gripping portion 31b of the fitting body 31, the strip plate 3 and the clamping portion 41 are locked to the locking piece 31c, and the bent piece 11b and the spacer body portion 42 are positioned outside the reinforcing bar gripping portion 31b. Furthermore, the pressing member 32, into which the retaining bolt 33 is screwed, is positioned on the inside of the strip-shaped plate 3, straddling the locking pieces 31c of the metal fitting body 31. Subsequently, by tightening the retaining bolt 33 screwed into the pressing member 32, the clamping portion 41 is clamped into the intersection, and the intersection is fixed in place. Therefore, at the intersection where the spacer 40A is attached, the clamping portion 41 of the spacer 40A is fixed to the outside of the strip plate 3, and the clamping portion 41 does not protrude above or below the strip plate 3. Thus, even when the reinforcing cage is made larger in diameter and denser, and the spacing between the reinforcing strip plate 3 and the stirrups 4, or between the stirrups 4 themselves, becomes very narrow, the spacer 40A can be reliably attached.

[0113] Furthermore, the reinforcing cage using the reinforcing bar fixing hardware set according to embodiment (5) above can obtain the same effects as the reinforcing cage according to embodiment (4) above, and the assembly method of the reinforcing cage according to embodiment (5) above can obtain the same effects as the installation method of the reinforcing cage according to embodiment (4) above.

[0114] Furthermore, the form of the spacer according to the present invention is not limited to the forms of spacers 40 and 40A described above, and various modifications are conceivable. Figure 9 is a perspective view showing an example of a spacer according to another embodiment. The spacer 40B is constructed with a roughly L-shaped strip plate having a width less than or equal to the width of the strip plate 3, with a short piece of the strip plate serving as a clamping portion 41A and a long piece of the strip plate serving as the spacer body portion 42A. The spacer body portion 42A is bent into a roughly handle shape to form a bulge portion 42a, and a locking portion 42b is formed at the end. The locking portion 42b may be in a form that can be locked to the stirrups 4, or it may be in a form that can be locked to the main reinforcement bars 2. With spacer 40B having the above configuration, it is possible to obtain substantially the same effects as spacers 40 and 40A described above, and it is also possible to manufacture it more easily.

[0115] Figure 10 is a perspective view showing an example of a spacer according to yet another embodiment. The spacer 40C comprises a clamping portion 41B made of a short-piece shaped plate having a width less than or equal to the width of the strip-shaped plate 3, and a spacer body portion 42B formed into a roughly handle shape by bending a steel bar such as a deformed reinforcing bar, with the clamping portion 41B and one end of the spacer body portion 42B being fixed together by welding or the like to form a single unit. With the spacer 40C having the above configuration, it is possible to obtain substantially the same effects as the spacers 40 and 40A described above, and by combining different materials, various forms can be adopted for the spacer body 42B, thereby increasing versatility.

[0116] The spacer mounting bracket, spacer, and rebar fixing bracket set according to the present invention can be widely applied to rebar cages for constructing civil engineering structures and building structures, such as rebar cages for constructing cast-in-place piles and rebar cages for constructing continuous underground walls. [Note] [Note 1] A spacer used together with a rebar fixing fitting that secures the intersection of a rod-shaped reinforcing bar and a strip-shaped member, The aforementioned intersection has a clamping portion that can be inserted into it, It comprises a clamping portion and a spacer body portion integrated therewith, A spacer characterized in that the spacer body has a bulging portion that extends in one direction. [Note 2] The spacer according to Appendix 1, characterized in that the clamping portion has a short piece shape with a width less than or equal to the width of the strip-shaped member. [Note 3] One end of a strip-shaped plate having a width less than or equal to the width of the aforementioned strip-shaped member is bent to form the clamping portion. The spacer according to Appendix 1, characterized in that the other end of the strip-shaped plate is bent to form the spacer body. [Note 4] The spacer according to any one of the appendices 1 to 3, characterized in that the clamping portion is provided perpendicular to the longitudinal direction of the spacer body. [Note 5] A set of reinforcing bar fixing fittings comprising a reinforcing bar fixing fitting for fixing the intersection of a rod-shaped reinforcing bar and a strip-shaped member, and a spacer described in any of the items 1 to 4 of the appendix, The aforementioned rebar fixing bracket is A rod-shaped reinforcing bar gripping portion is positioned to sandwich the aforementioned strip-shaped member in the vertical direction and has a notch for inserting the rod-shaped reinforcing bar, A rebar fixing bracket set characterized by comprising a screw hole plate portion that connects the two rod-shaped rebar gripping portions and has a screw hole for bolt threading formed therein for tightening the intersection portion while the clamping portion of the spacer is clamped at the intersection portion. [Note 6] A set of reinforcing bar fixing fittings comprising a reinforcing bar fixing fitting for fixing the intersection of a rod-shaped reinforcing bar and a strip-shaped member, and a spacer described in any of the items 1 to 4 of the appendix, The aforementioned rebar fixing bracket is A metal fitting body is formed by bending a plate-like body into a roughly U-shape so as to straddle the aforementioned rod-shaped reinforcing bar, thereby forming left and right side plate portions and a rod-shaped reinforcing bar gripping portion, with locking pieces formed on the tip sides of the left and right side plate portions, A thick, rectangular plate is bent into a roughly U-shape so as to straddle the locking pieces of the left and right side plates of the metal fitting body, forming left and right folded pieces and a connecting plate, a screw hole for screwing a bolt is formed in the connecting plate, and a pressing member is provided into the screw hole for screwing a retaining bolt. A rebar fixing bracket set characterized in that the pressing member is configured to press the strip-shaped member toward the rod-shaped reinforcing bar while the clamping portion of the spacer is clamped at the intersection. [Note 7] A reinforcing cage assembled using the reinforcing bar fixing hardware set described in Appendix 5 or Appendix 6, Multiple rod-shaped reinforcing bars arranged around a reference axis, substantially parallel to the direction of the reference axis, Inside the plurality of rod-shaped reinforcing bars, reinforcing strip members are arranged at predetermined intervals in the direction of the reference axis, intersecting these rod-shaped reinforcing bars; The system comprises a plurality of stirrups arranged in a circumferential direction substantially perpendicular to the reference axis, intersecting the plurality of rod-shaped reinforcements. A reinforcing cage characterized in that the clamping portion of the spacer is sandwiched in a part of the intersection of the rod-shaped reinforcing bar and the strip-shaped member, and the intersection is tightened by the reinforcing bar fixing fitting. [Note 8] A method for assembling a reinforcing cage using the reinforcing bar fixing hardware set described in Appendix 5 or Appendix 6, A step of arranging multiple rod-shaped reinforcing bars around a reference axis, substantially parallel to the direction of the reference axis, The process involves arranging reinforcing strip members at predetermined intervals in the direction of the reference axis, so as to intersect with the aforementioned rod-shaped reinforcing bars, inside the plurality of rod-shaped reinforcing bars, The process involves inserting the clamping portion of the spacer into a part of the intersection between the rod-shaped reinforcing bar and the strip-shaped member, and then tightening the intersection with the reinforcing bar fixing fitting. A method for assembling a reinforcing cage, characterized by including the step of arranging and fixing a plurality of stirrups so as to intersect with the plurality of rod-shaped reinforcing bars in a circumferential direction substantially perpendicular to the reference axis. [Explanation of symbols]

[0117] 1. 1A Reinforced Steel Cage 2. Rod-shaped muscles 3. Strip-shaped plate (strip-shaped member) 4. Girdle muscles (hoop muscles) 5. Mounting bracket 5A Rebar fixing bracket 6. Rod-shaped muscle gripping section 6a Notch 7. Screw hole plate section 7a Threaded hole 8 volts 9 Spacers 9a head 9b Shaft 9c bearing 10, 10A, 10B Spacer mounting brackets 11 Plate 11a Clamping part 11b Folded portion 11c Bend part 12 Spacer mounting section 15 Spacers 15a head 15b Shaft 15c Tubular member 20, 20A Rebar Fixing Brackets 21, 21A Rod muscle grasping part 21a, 21b Notches 21ba tapered section 21bb Locking part 22 Screw hole plate section 22a Threaded hole 23 volts 30 Rebar fixing hardware 31 Metal fittings 31a Left and right side plates 31b Rod-shaped muscle gripping section 31c Locking piece 31ca Notch 32 Pressing member 32a Left and right folding pieces 32b Connecting plate part 32c threaded hole 33 Retaining bolts 40, 40A, 40B, 40C spacers 41, 41A, 41B Clamping section 42, 42A, 42B Spacer body 42a Bulge 42b Locking part

Claims

1. A spacer mounting bracket used together with a rebar fixing bracket for fixing the intersection of a rod-shaped reinforcing bar and a strip-shaped member, A strip-shaped plate having a width less than or equal to the width of the aforementioned strip-shaped member is bent into a substantially L-shape, so that a clamping portion and a folded portion that can be inserted into the intersection are formed. A spacer mounting bracket characterized in that a spacer mounting portion is fixed near the bend between the clamping portion and the folded portion.

2. The aforementioned spacer mounting portion, The spacer is composed of a pipe material into which the other end of the shaft portion is inserted, the spacer having a dish-shaped head and a shaft portion with one end in the longitudinal direction joined to the inside of the head. The spacer mounting bracket according to claim 1, characterized in that the pipe material is fixed with its central axis facing toward the tip of the bent portion.

3. A set of reinforcing bar fixing fittings comprising a reinforcing bar fixing fitting for fixing the intersection of a rod-shaped reinforcing bar and a strip-shaped member, and a spacer mounting fitting according to claim 1 or claim 2, The aforementioned rebar fixing bracket is A rod-shaped reinforcing bar gripping portion is positioned to sandwich the aforementioned strip-shaped member in the vertical direction and has a notch for inserting the rod-shaped reinforcing bar, A rebar fixing bracket set characterized by comprising a screw hole plate portion that connects the two rod-shaped rebar gripping portions and has a screw hole for bolt threading formed at the intersection portion for tightening the intersection portion while the clamping portion of the spacer mounting bracket is clamped at the intersection portion.

4. A set of reinforcing bar fixing fittings comprising a reinforcing bar fixing fitting for fixing the intersection of a rod-shaped reinforcing bar and a strip-shaped member, and a spacer mounting fitting according to claim 1 or claim 2, The aforementioned rebar fixing bracket is A metal fitting body is formed by bending a plate-like body into a roughly U-shape so as to straddle the aforementioned rod-shaped reinforcing bar, thereby forming left and right side plate portions and a rod-shaped reinforcing bar gripping portion, with locking pieces formed on the tip sides of the left and right side plate portions, A thick, rectangular plate is bent into a roughly U-shape so as to straddle the locking pieces of the left and right side plates of the metal fitting body, forming left and right folded pieces and a connecting plate, a screw hole for screwing a bolt is formed in the connecting plate, and a pressing member is provided into the screw hole for screwing a retaining bolt. A rebar fixing bracket set characterized in that the pressing member is configured to press the strip-shaped member toward the rod-shaped reinforcing bar while the clamping portion of the spacer mounting bracket is clamped at the intersection.

5. A reinforcing cage assembled using the reinforcing bar fixing hardware set described in claim 3 or claim 4, Multiple rod-shaped reinforcing bars arranged around a reference axis, substantially parallel to the direction of the reference axis, Inside the plurality of rod-shaped reinforcing bars, reinforcing strip members are arranged at predetermined intervals in the direction of the reference axis, intersecting these rod-shaped reinforcing bars; The system comprises a plurality of stirrups arranged in a circumferential direction substantially perpendicular to the reference axis, intersecting the plurality of rod-shaped reinforcements. A reinforcing cage characterized in that the clamping portion of the spacer mounting bracket is sandwiched between a part of the intersection of the rod-shaped reinforcing bar and the strip-shaped member, and the intersection is tightened by the reinforcing bar fixing bracket.

6. A method for assembling a reinforcing cage using the reinforcing bar fixing hardware set described in claim 3 or claim 4, A step of arranging multiple rod-shaped reinforcing bars around a reference axis, substantially parallel to the direction of the reference axis, The process involves arranging reinforcing strip members at predetermined intervals in the direction of the reference axis, so as to intersect with the aforementioned rod-shaped reinforcing bars, inside the plurality of rod-shaped reinforcing bars, The process involves inserting the clamping portion of the spacer mounting bracket into a part of the intersection between the rod-shaped reinforcing bar and the strip-shaped member, and then tightening the intersection with the reinforcing bar fixing bracket. A method for assembling a reinforcing cage, characterized by including the step of arranging and fixing a plurality of stirrups so as to intersect with the plurality of rod-shaped reinforcing bars in a circumferential direction substantially perpendicular to the reference axis.

Images