JP2020117923A - Securing jig for post-installation bar-shaped member and securing method - Google Patents

Abstract

To provide a securing jig for a post-installation bar-shaped member with a simple structure allowing a bar-shaped member to be temporarily secured with easiness.SOLUTION: A securing jig 10 to temporarily secure a bar-shaped member (reinforcement bar 3) when securely installing the bar-shaped member 3 inserted in an insertion hole 2 formed in a concrete structure 1 is provided with a base part 11 secured in the concrete structure 1 and a pressing member 21 holding the bar-shaped member 3 projecting from the insertion hole 2. The base part 11 is provided with a through hole 13 where the bar-shaped member 3 is inserted, and the pressing members 21 are arranged in a plurality of positions around the bar-shaped member 3. The pressing member 21 is provided with an erected plate part 22 erecting from the base part 11 and a screw member 23 screwed in the erected plate part 22. The screw member 23 is disposed toward a side surface of the bar-shaped member 3 in a projecting and retracting manner.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fixing jig and a fixing method for a post-installed rod-shaped member.

When reinforcing existing concrete-based structures, attaching reinforcing members, or installing new structural members, bar-shaped members such as shear reinforcing bars and reinforcing bars that are the main bars can be post-installed on existing structural members. Need to be established. In particular, when fixing the reinforcing bar upward, the reinforcing bar may be lowered due to its own weight, so that it was necessary to temporarily fix the reinforcing bar. Conventionally, the jig shown in Patent Document 1 has been used to temporarily fix the reinforcing bar. In such a jig, the reinforcing bar is temporarily fixed to the existing structural member by sandwiching the reinforcing bar by using a pair of split plates that are split so as to straddle an opening for inserting the reinforcing bar.

JP, 2013-87496, A

When using the split plate of Patent Document 1, when the split plate is installed and the reinforcing bars are inserted, two fixtures are further attached and closed, so that the structure and procedure are complicated, and a lot of labor and time are required for construction. was there.

From this point of view, it is an object of the present invention to provide a post-fixing rod-shaped member fixing jig that has a simple structure and can easily temporarily fix the rod-shaped member. Another object of the present invention is to provide a method of fixing a post-processed rod-shaped member, which can easily temporarily fix the rod-shaped member using the fixing jig.

A first aspect of the invention for solving such a problem is a post-fixing jig for fixing a rod-shaped member temporarily fixed at the time of fixing the rod-shaped member inserted into an insertion hole formed in a concrete structure. A base portion fixed to the concrete structure, and a holding portion for holding a rod-shaped member protruding from the insertion hole. The base portion includes an insertion portion through which the rod-shaped member is inserted, and the pressing portions are provided at a plurality of places, and are arranged around the rod-shaped member.

The rod-shaped member in the present invention is used as a shear reinforcing bar or an anchor when concrete is additionally poured into an existing concrete structure, and is composed of, for example, deformed reinforcing bars or steel bars. According to the jig for fixing the post-installed rod-shaped member having the above structure, the rod-shaped member can be easily temporarily fixed only by fixing the base portion to the concrete structure and pressing the rod-shaped member with the holding portion. Further, such a fixing jig has a simple structure. Further, since the pressing portion is arranged so as to surround the rod-shaped member, the rod-shaped member can be fixed in a stable state.

In the fixing jig of the present invention, it is preferable that the pressing portion includes a rising plate portion that rises from the base portion, and a screw member that is screwed into the rising plate portion, and the screw member is It is preferable that the rod-shaped member is provided so as to be retractable toward the side surface. With such a configuration, the rod-shaped member is pressed from the plurality of directions by the plurality of screw members, so that the rod-shaped member can be reliably held. Further, the fixing position of the rod-shaped member can be adjusted by changing the protruding/retracting position of the screw member.

Further, in the fixing jig of the present invention, the insertion portion is provided with a lid member that closes the insertion hole, and the lid member is made of an elastic member and has a diameter larger than that of the insertion hole. Those having a rod-shaped member insertion hole having a small diameter are preferable. According to such a configuration, since the insertion hole is closed by the lid member, it is possible to prevent the dripping of the filling material when the fluidity of the filling material is high. Further, when a cement-based filler is used, the filler can be kept wet by closing the filler with the lid member, so that curing can be performed in a favorable environment. Further, since the lid member is composed of the elastic member, even if the fixing portion having a diameter larger than that of the rod-shaped member is provided at the tip of the rod-shaped member, the rod-shaped member is inserted from the rod-shaped member insertion hole to the insertion hole. And can be inserted.

A second invention for solving the above-mentioned problems is a method for fixing a post-processed rod member using the jig for fixing the post-processed rod member according to any one of claims 1 to 3. Such a fixing method includes a drilling step of drilling an insertion hole of a rod-shaped member in a concrete structure, and the rod-shaped member protruding from the insertion hole with a fixing filler and a rod-shaped member inserted in the insertion hole. Is temporarily held by the holding portion of the fixing jig, and a removing step of releasing the temporary fixing of the rod-shaped member and removing the fixing jig.

According to the post-installation rod-shaped member fixing method of the present invention, the rod-shaped member can be easily temporarily fixed only by fixing the base portion to the concrete structure and pressing the rod-shaped member with the holding portion. Further, since the pressing portion is arranged around the rod-shaped member, the rod-shaped member can be fixed in a stable state.

According to the present invention, the structure of the fixing jig is simple and the rod-shaped member can be easily temporarily fixed.

It is sectional drawing which showed the state which temporarily fixed the rod-shaped member using the jig|tool for fixing the post-installed rod-shaped member which concerns on embodiment of this invention. (A) is a side view showing a fixing jig for a post-installed rod-shaped member according to the embodiment of the present invention, and (b) is a bottom view. FIG. 3 is an exploded perspective view of the fixing jig for the post-installed rod-shaped member according to the embodiment of the present invention, which is looked up from below. (A) is sectional drawing which showed the drilling process of the fixing method of the post-processing rod-shaped member which concerns on embodiment of this invention, (b) is sectional drawing which showed the mounting process of the fixing jig, (c) is filling. A sectional view showing a material filling step, (d) a sectional view showing a rod-shaped member inserting step, (e) a sectional view showing a rod-shaped member clamping step, and (f) a fixing jig. It is sectional drawing which showed the outer process.

A fixing jig and a fixing method for a post-processed rod-shaped member according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the present embodiment, as shown in FIG. 1, a reinforcing bar 3 for reinforcement, which is a rod-shaped member, and a filling material 4 for fixation are inserted into an upward insertion hole 2 formed in an existing concrete structure 1 from below. The case of insertion will be described as an example. The insertion hole 2 is formed in a circular cross section having a size into which the reinforcing bar 3 can be inserted.

The reinforcing bar 3 is composed of, for example, a deformed reinforcing bar, and is used as a shear reinforcing bar or an anchor when the concrete is additionally poured into the existing concrete structure 1. An expanded fixing plate 5a is attached to the upper end of the reinforcing bar 3. Although the fixing plate 5b is attached to the lower end of the reinforcing bar 3, the shape of the fixing plate 5b is not limited to the shape shown in FIG. Further, the rod-shaped member is not limited to the deformed bar and may be another member such as a steel rod. Further, the rod-shaped member includes known embedding materials used for concrete structures such as anchors.

The filler 4 is made of, for example, an organic filler (epoxy resin or the like) or an inorganic cement filler (mortar or the like), and is provided from the bottom with a nozzle (not shown) or the like to the inner side of the insertion hole 2. (Upper part) is filled. When the viscosity of the filling material 4 is low, the filling material 4 may be inserted into the insertion hole while being contained in a bag-shaped container (not shown).

As shown in FIGS. 2 and 3, the fixing jig 10 is used to prevent the reinforcing bar 3 from falling when fixing the reinforcing bar 3 inserted into the insertion hole 2 formed in the concrete structure 1. 3 is a jig for temporarily fixing 3. The fixing jig 10 includes a base portion 11 and a holding portion 21.

The base portion 11 is a portion fixed to the lower surface of the concrete structure 1, and is made of, for example, a rectangular metal plate. The base portion 11 includes an insertion portion 13 into which the reinforcing bar 3 is inserted. The insertion portion 13 includes a through hole 13a formed at a central position of the base portion 11 and a cutout portion 13b connected from the through hole 13a to the outer periphery of the base portion 11 ((b) of FIG. 2 and FIG. 2). 3). The through hole 13 a has a circular shape with a part cut away, and has an inner diameter equivalent to that of the insertion hole 2. The inner diameter of the through hole 13a may be smaller or larger than the inner diameter of the insertion hole 2 as long as the fixing plate 5a of the reinforcing bar 3 can be inserted therethrough.

The cutout portion 13b is a portion through which the reinforcing bar 3 passes when the fixing jig 10 is laterally slid and removed after the reinforcing bar 3 is fixed to the concrete structure 1. The notch 13b has parallel opposite sides facing each other. The width between the opposite sides is a length that allows the body of the reinforcing bar 3 to pass through (the size is smaller than the diameter of the through hole 13a and slightly larger than the body of the reinforcing bar 3).

Anchor insertion holes 14 (see FIG. 3) are formed at the four corners of the base portion 11, respectively. A screw-shaped anchor 15 screwed into the concrete structure 1 is inserted into each anchor insertion hole 14. The base portion 11 is fixed to the concrete structure 1 by these anchors 15.

The insertion portion 13 is provided with a lid member 16 that closes the insertion hole 2. The lid member 16 is composed of a pad made of an elastic member and has a rectangular shape in plan view. The short side dimension of the lid member 16 is smaller than the inner diameter of the through hole 13a. When the lid member 16 is installed, the insertion hole 2 and a part of the through hole 13a are open on both sides in the width direction of the lid member 16. The lid member 16 includes a rod-shaped member insertion hole 17 through which the reinforcing bar 3 is inserted. The rod-shaped member insertion hole 17 has an inner diameter equal to the outer diameter of the body of the reinforcing bar 3. A plurality of cuts 17a (see FIG. 2(b) and FIG. 3) are radially formed on the peripheral edge of the rod-shaped member insertion hole 17 so that the hole can be expanded when the reinforcing bar 3 passes through the fixing plate 5a. Is configured.

It should be noted that the lid member 16 may not be provided if the viscosity of the filling material 4 is high and there is no risk of dropping from the insertion hole 2.

The holding portion 21 includes a rising plate portion 22 that stands up from the base portion 11 and a screw member 23 that pushes the reinforcing bar 3. The holding portions are provided at a plurality of places (two places in this embodiment) and are arranged around the reinforcing bar 3.

The rising plate portion 22 is composed of one plate portion of the angle member 24 having an L-shaped cross section. The angle member 24 is fixed to the base portion 11 by welding the other plate portion to the base portion 11. A through hole (not shown) is formed in one plate portion, and the nut 25 is attached coaxially with the through hole. The pair of angle members 24, 24 are arranged so as to face each other with the reinforcing bar 3 interposed therebetween, and one plate portion is parallel to each other. The through holes of both angle members 24, 24 and the nut 25 are arranged coaxially. The axial direction of the through hole and the nut 25 intersects with the reinforcing bar 3.

The screw member 23 is screwed into the screw hole of the rising plate portion 22 and is provided so as to be retractable toward the side surface of the reinforcing bar 3. The screw member 23 includes a bar screw portion 23a and a pressing portion 23b. The rod screw portion 23a is a portion screwed into the screw hole, and by rotating, the rod screw portion 23a appears and disappears in the axial direction, so that the reinforcing bar 3 can be tightened. The pressing portion 23b is attached to the tip of the rod screw portion 23a so as to be relatively rotatable. A pad 23c made of an elastic member is provided at the tip of the pressing portion 23b, and the pad 23c is brought into close contact with the side surface of the reinforcing bar 3. In the present embodiment, the contact surface of the pad 23c is flat, but may be arcuate along the side surface of the reinforcing bar 3.

Next, with reference to FIG. 4, a method of fixing the post-installed rod-shaped member using the fixing jig 10 having the above-described structure will be described. This fixing method includes a drilling step, a temporary fixing step, a curing step, and a removing step.

As shown in FIG. 4A, the drilling step is a step of drilling the insertion hole 2 of the reinforcing bar 3 in the concrete structure 1. In the drilling step, the drilling tool is drilled upward from below the concrete structure 1.

The temporary fixing step is a step of holding the reinforcing bar 3 protruding from the insertion hole 2 by the holding portion 21 of the fixing jig 10 in a state where the filler 4 and the reinforcing bar 3 are inserted into the insertion hole 2. In the present embodiment, the temporary fixing step includes an attaching step, a filling step, a rod-shaped member inserting step, and a rod-shaped member holding step.

As shown in FIG. 4B, the attaching step is a step of fixing the fixing jig 10 to the lower surface of the concrete structure 1. In the attaching step, the fixing jigs 10 are fixed by inserting the screw-shaped anchors 15 into the four corners of the base portion 11 and screwing them into the concrete structure 1. The fixing jig 10 is arranged such that the drilled insertion hole 2 and the through hole 13a are coaxial with each other.

As shown in FIG. 4C, the filling step is a step of filling the filling material 4 into the insertion hole 2. In the filling step, the filling material 4 is inserted into the insertion hole 2 from the rod-shaped member insertion hole of the lid member 16 using a nozzle or the like (not shown).

As shown in (d) of FIG. 4, the rod-shaped member insertion step is a step of inserting the reinforcing bar 3 into the insertion hole 2. In the rod-shaped member insertion step, the upper portion of the reinforcing bar 3 is inserted through the rod-shaped member insertion hole 17 of the lid member 16. At this time, since a plurality of cuts 17a are formed in the peripheral portion of the rod-shaped member insertion hole 17, when the fixing plate 5a of the reinforcing bar 3 is pushed in, the rod-shaped member insertion hole 17 is expanded. Therefore, the fixing plate 5a can pass through the lid member 16.

The order of the attaching step, the filling step, and the rod-shaped member inserting step can be exchanged. For example, the mounting step may be performed after the filling step and the rod-shaped member inserting step are performed first. In this case, the protruding portion of the reinforcing bar 3 passes through the cutout portion 13b of the base portion 11 and the fixing jig 10 is arranged at a predetermined position. Further, the filling step may be performed after the rod-shaped member inserting step. In this case, the reinforcing bar 3 is temporarily fixed at a predetermined position in the insertion hole 2, and the gap around the reinforcing bar 3 is filled with the filler using a nozzle. When the filling step is performed after the attaching step and the rod-shaped member inserting step, nozzles are inserted into the insertion holes 2 through gaps between the through holes 13a on both sides of the lid member 16 in the width direction, and filling is performed. Inject the material.

As shown in (e) of FIG. 4, the temporary fixing step is a step of holding the rebar 3 by the pair of holding portions 21 and 21 of the fixing jig 10 and temporarily fixing it. In the temporary fixing step, the screw member 23 of the pressing portion 21 is rotated to press the pressing portion 23b at the tip against the reinforcing bar 3. Since the pressing portion 21 is arranged on both sides of the reinforcing bar 3, the reinforcing bar 3 is clamped. At this time, the pad 23c is deformed along the side surface of the reinforcing bar 3 and comes into close contact with the side surface.

The curing step is a step of waiting for the filling material 4 to set while the reinforcing bars 3 are temporarily fixed. In the curing step, the filling material 4 is waited until the desired strength is developed.

The removing step is a step of removing the fixing jig 10 from the concrete structure 1 after the curing is completed. In the removing step, after temporarily fixing the reinforcing bars 3, the anchor 15 is removed and the base portion 11 is removed from the concrete structure 1. At this time, the fixing jig 10 is slid laterally so that the protruding portion of the reinforcing bar 3 passes through the cutout portion 13b of the base portion 11. When the removing process is completed, the reinforcing bar 3 is fixed in the insertion hole 2 as shown in FIG. Note that the removing step may be started as long as the reinforcing material 3 has strength enough to prevent the reinforcing bar 3 from falling during the curing step. In this case, part of the curing process and the removal process overlap.

Hereinafter, the operation and effect of the fixing jig 10 and the fixing method for the post-installed rod-shaped member according to the present embodiment will be described. According to the fixing jig 10 and the fixing method, the reinforcing bar 3 can be easily temporarily fixed only by fixing the base part 11 to the concrete structure 1 and pressing the reinforcing bar 3 with the pressing parts 21 and 21. .. As a result, the reinforcing bar 3 can be reliably fixed at a predetermined position. In addition, since the fixing jig has a simple structure and the pressing portions 21 and 21 are arranged around the reinforcing bar 3, by sandwiching the reinforcing bar 3 from both sides, the reinforcing bar 3 is stable. Can be fixed.

Further, in the present embodiment, the pressing portion 21 includes the screw member 22 that can be retracted toward the side surface of the reinforcing bar 3, so that the reinforcing member 3 can be firmly pressed by the screw member 22. Therefore, the reinforcing bar 3 can be reliably clamped. Furthermore, by changing the protruding/retracting position of each screw member 22, the fixed position and the inclination angle of the reinforcing bar 3 can be adjusted.

Further, in the present embodiment, since the insertion member 13 is provided with the lid member 16 that closes the insertion hole 2, in the case of the cement-based filler 4, the mortar in the insertion hole 2 is hard to come into contact with air and is dried. It's hard to do. Therefore, the wet state of the filler 4 can be maintained, and the curing can be performed in a favorable environment. Further, when the viscosity of the filler 4 is low, it is possible to prevent the filler 4 from hanging down. Further, since the lid member 16 is made of an elastic member, the fixing plate 5a having a diameter larger than that of the reinforcing bar 3 can be inserted into the insertion hole 2 from the rod-shaped member insertion hole 17. In particular, since the notch 17a is formed in the peripheral portion of the rod-shaped member insertion hole 17, the rod-shaped member insertion hole 17 can be easily expanded.

Further, since the base portion 11 is fixed to the concrete structure 1 by the screw-shaped anchor 15, the fixing jig 10 can be easily attached and detached. As a result, workability is improved and the fixing jig 10 can be diverted, so that it is excellent in economic efficiency.

Although the embodiments for carrying out the present invention have been described above, the present invention is not intended to be limited to the above embodiments, and design changes can be appropriately made without departing from the spirit of the present invention. For example, in the above-described embodiment, the angle member 24 having an L-shaped cross section is welded to the base portion 11 to form the rising plate portion 22, but the present invention is not limited to this. For example, a part of the base portion 11 may be cut and raised. Further, the shape of the rising plate portion 22 is not limited to one in which flat plates are arranged on both sides of the reinforcing bar 3. For example, one side of the reinforcing bar 3 may be surrounded by a rising plate portion having a semicircular shape in plan view.

Moreover, in the said embodiment, although the pressing part 23b is pressed on the reinforcing bar 3 with the screw member 23, it is not restricted to this. For example, the pressing portion 23b may be pressed against the reinforcing bar 3 by a spring. Note that it is preferable to hold the reinforcing bar 3 by the screw member 23 as in the above-described embodiment because the reinforcing bar 3 can be fixed more firmly than the spring.

Further, in the above-described embodiment, the holding portion 21 is provided at two places sandwiching the reinforcing bar 3, but the present invention is not limited to this. For example, it may be provided in three places so as to surround the reinforcing bar 3, or may be provided in four or more places. If the pressing parts 21 are installed at three or four positions, the horizontal position for pressing the reinforcing bar 3 can be finely adjusted by changing the position of the screw member 23. Thereby, the inclination angle of the reinforcing bar 3 can be adjusted more accurately.

Moreover, in the said embodiment, although the pressing part 21 is provided in the height of one place in the axial direction of the reinforcing bar 3, it is not limited to this. The pressing portion may be provided at two or more height positions in the axial direction of the reinforcing bar. By doing so, particularly when the protruding length of the reinforcing bar 3 from the concrete structure 1 is large, the reinforcing bar can be reliably pressed and the positional accuracy of the reinforcing bar can be further improved.

Furthermore, although the fixing jig 10 has been described in the above embodiment by way of example of the upward construction in which the reinforcing bar 3 is inserted upward, the present invention is not limited to this. The fixing jig 10 according to the present invention can also be applied to the case where temporary fixing is required in order to accurately determine the position of the reinforcing bar during lateral installation.

Moreover, in the said embodiment, although the insertion part 13 is equipped with the through-hole 13a and the notch part 13b, it is not limited to this. In the case where the fixing plate on the lower side of the reinforcing bar 3 is not provided and the fixing portion is formed by bending the lower end portion, etc., the notch portion may not be provided and the insertion portion 13 may be formed only by the through hole 13a. ..

Furthermore, in the above-described embodiment, the fixing jig 10 is fixed to the concrete structure 1 using the screw-shaped anchor 15, but the present invention is not limited to this. An iron plate may be installed on the concrete structure 1, a magnet may be attached to the fixing jig, and the fixing jig may be magnetically attached to the iron plate. By doing so, the fixing operation of the fixing jig becomes easier.

1 Concrete structure 2 Insertion hole 3 Reinforcing bar (bar-shaped member)
4 Filling material 10 Fixing jig 11 Base part 13 Insertion part 16 Lid member 17 Rod-like member insertion hole 21 Holding part 22 Standing plate part 23 Screw member

Claims (4)

A fixing jig for temporarily fixing the rod-shaped member at the time of fixing and fixing the rod-shaped member inserted into the insertion hole formed in the concrete structure,
A base portion fixed to the concrete structure,
A pressing portion for holding the rod-shaped member protruding from the insertion hole,
The base portion includes an insertion portion through which the rod-shaped member is inserted,
The jig for fixing a post-installed rod-shaped member is characterized in that the pressing portion is provided at a plurality of places and is arranged around the rod-shaped member. The pressing portion includes a rising plate portion rising from the base portion, and a screw member screwed to the rising plate portion,
The jig for fixing a post-installed rod-shaped member according to claim 1, wherein the screw member is provided so as to be retractable toward a side surface of the rod-shaped member. The insertion portion is provided with a lid member for closing the insertion hole,
The post-installed rod-shaped member according to claim 1 or 2, wherein the lid member is formed of an elastic member and includes a rod-shaped member insertion hole having a diameter smaller than the diameter of the insertion hole. Fixing jig. A method for fixing a post-processed rod-shaped member using the jig for fixing the post-processed rod-shaped member according to any one of claims 1 to 3,
A boring process for boring an insertion hole of a rod-shaped member in a concrete structure,
A temporary fixing step of holding the rod-shaped member protruding from the insertion hole in a state where the fixing filler and the rod-shaped member are inserted into the insertion hole, by the holding portion of the fixing jig.
And a detaching step for removing the fixing jig after temporarily fixing the rod-shaped member.

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