JP7283907B2 - FIXING JIG AND FIXING METHOD FOR POST-CONSTRUCTED BAR - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act (1) DVD titled "Summary of technical papers of academic lectures at the 2018 Annual Conference (Tohoku), Summary of architectural design presentations" issued by Architectural Institute of Japan on July 20, 2018- Recorded in ROM (2) Presented at “2018 Architectural Institute of Japan Conference [Tohoku]” held by Architectural Institute of Japan on September 4, 2018

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing jig and fixing method for post-installed rod-shaped members.

When reinforcing existing concrete structures, installing reinforcing members, or installing new structural members, rod-shaped members such as shear reinforcing bars and reinforcing bars that serve as main bars can be post-installed on existing structural members. need to be established. In particular, when a reinforcing bar is fixed upward, it is necessary to temporarily fix the reinforcing bar because the reinforcing bar may be lowered by its own weight. Conventionally, a jig disclosed in Patent Document 1 was used to temporarily fix the reinforcing bars. Such a jig temporarily fixes the reinforcing bar to the existing structural member by sandwiching the reinforcing bar using a pair of divided plates that are divided so as to straddle the opening for inserting the reinforcing bar.

JP 2013-87496 A

When using the split plate of Patent Document 1, when installing the split plate and inserting the reinforcing bars, the structure and procedure are complicated, such as attaching and closing two fixtures, and the construction takes a lot of time and effort. was there.

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

A first invention for solving such problems is a post-installed rod-shaped member fixing jig for temporarily fixing a rod-shaped member inserted into an insertion hole formed in a concrete structure during fixing work of the rod-shaped member. and a base portion fixed to the concrete structure, and a pressing portion holding a rod-like member protruding from the insertion hole. The base portion includes an insertion portion through which the rod-like member is inserted, and the insertion portion includes a through hole formed at a center position of the base portion and a notch extending from the through hole to the outer periphery of the base portion. The through-hole has a partially notched circular shape, and the holding portions are provided at a plurality of locations, are arranged around the rod-shaped member , and are attached to the base portion. It is characterized by being fixed .

The rod-shaped member in the present invention is used as a shear reinforcing bar or an anchor when adding concrete to an existing concrete structure, and is composed of, for example, a deformed reinforcing bar or a steel bar. According to the fixing jig for the post-installed rod-shaped member configured as described above, the rod-shaped member can be easily temporarily fixed simply by fixing the base portion to the concrete structure and pressing the rod-shaped member with the pressing portion. Also, such a fixing jig has a simple structure. Furthermore, since the holding 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 holding portion includes a rising plate portion rising from the base portion and a screw member screwed into the rising plate portion, and the screw member It is provided so as to be able to appear and retract toward the side surface of the rod-shaped member, and includes a rod threaded portion and a pressing portion, the pressing portion is attached to the tip of the rod threaded portion so as to be relatively rotatable, and the tip of the pressing portion is: It is preferable that a pad made of an elastic member is provided . According to such a configuration, since the rod-shaped member is pressed from a plurality of directions by the plurality of screw members, the rod-shaped member can be reliably held. Furthermore, the fixed position of the rod-like 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 the diameter of the insertion hole. One having a rod-shaped member insertion hole having a small diameter is preferable. According to such a configuration, since the insertion hole is closed with the cover member, dripping of the filler can be prevented when the filler has high fluidity. Moreover, when a cement-based filler is used, the filler can be kept moist by covering the filler with a lid member, so curing can be performed in a favorable environment. Further, since the cover member is made of an 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 can be moved from the rod-shaped member insertion hole to the insertion hole. can be inserted with

A second invention for solving the above-mentioned problems is a method for fixing a post-installed rod-shaped member using the fixture for fixing a post-installed rod-shaped member according to any one of claims 1 to 3. Such a fixing method includes a drilling step of drilling an insertion hole for a rod-shaped member in a concrete structure, and the rod-shaped member protruding from the insertion hole in a state in which a fixing filler and a rod-shaped member are inserted into the insertion hole. is held by a pressing portion of the fixing jig; and a removing step of removing the fixing jig by releasing the temporary fixing of the rod-shaped member and sliding the fixing jig in the lateral direction . characterized by

According to the post-installed rod-shaped member fixing method of the present invention, the rod-shaped member can be easily temporarily fixed simply by fixing the base portion to the concrete structure and pressing the rod-shaped member with the pressing portion. Also, 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.

FIG. 4 is a cross-sectional view showing a state in which a rod-shaped member is temporarily fixed using a post-installed rod-shaped member fixing jig according to an embodiment of the present invention. (a) is a side view showing a fixing jig for a post-installed rod-shaped member according to an embodiment of the present invention, and (b) is a bottom view. FIG. 4 is an exploded perspective view looking up from below of a post-installed rod-shaped member fixing jig according to an embodiment of the present invention. (a) is a cross-sectional view showing a hole drilling process of a fixing method for a post-installed rod-shaped member according to an embodiment of the present invention, (b) is a cross-sectional view showing a fixing jig mounting process, and (c) is a filling Sectional view showing a material filling process, (d) a sectional view showing a rod-shaped member insertion process, (e) a sectional view showing a rod-shaped member clamping process, and (f) a fixing jig removal. It is a cross-sectional view showing an outer process.

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

The reinforcing bars 3 are made of deformed reinforcing bars, for example, and are used as shear reinforcing bars and anchors when adding concrete to the existing concrete structure 1 . A fixed plate 5 a having an enlarged diameter is attached to the upper end of the reinforcing bar 3 . Although the fixing plate 5b is also attached to the lower end portion of the reinforcing bar 3, the shape of the fixing plate 5b is not limited to the shape shown in FIG. Moreover, the bar member is not limited to the deformed reinforcing bar, and may be another member such as a steel bar. Furthermore, the rod-shaped member includes known embedding materials used in concrete structures, such as anchors.

The filler 4 is made of, for example, an organic filler (such as epoxy resin) or an inorganic cement-based filler (such as mortar). (top) is filled. In addition, when the viscosity of the filler 4 is low, it may be inserted into the insertion hole while being contained in a bag-like container (not shown).

As shown in FIGS. 2 and 3, the fixing jig 10 is used to prevent the reinforcing bars 3 from falling down when the reinforcing bars 3 inserted into the insertion holes 2 formed in the concrete structure 1 are fixed. 3 is a jig for temporarily fixing. The fixing jig 10 has a base portion 11 and a pressing portion 21 .

The base portion 11 is a portion fixed to the lower surface of the concrete structure 1, and is configured by, for example, a rectangular metal plate. The base portion 11 has an insertion portion 13 through which the reinforcing bar 3 is inserted. The insertion portion 13 includes a through hole 13a formed at the center of the base portion 11, and a notch portion 13b extending from the through hole 13a to the outer periphery of the base portion 11 (FIGS. 2B and 2C). 3). The through-hole 13 a has a partially cut circular shape 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 through the through-hole 13a.

The notch portion 13b is a portion through which the reinforcing bar 3 passes when the fixing jig 10 is slid laterally to be 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 dimension between the opposite sides is a length through which the body of the reinforcing bar 3 can pass (a dimension 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 to be screwed into the concrete structure 1 is inserted into each anchor insertion hole 14 . These anchors 15 fix the base portion 11 to the concrete structure 1 .

A lid member 16 that closes the insertion hole 2 is provided in the insertion portion 13 . 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, parts of the insertion hole 2 and the through hole 13a are opened on both sides of the lid member 16 in the width direction. The lid member 16 has a rod-shaped member insertion hole 17 through which the reinforcing bar 3 is inserted. The rod-like member insertion hole 17 has an inner diameter equal to the outer diameter of the trunk portion of the reinforcing bar 3 . A plurality of notches 17a (see FIG. 2B and FIG. 3) are radially formed in the periphery of the rod-shaped member insertion hole 17 so that the hole is expanded when the reinforcing bar 3 passes through the fixing plate 5a. is configured to

Note that the lid member 16 may not be provided when the viscosity of the filler 4 is high and there is no fear of it dripping from the insertion hole 2 .

The pressing portion 21 includes a rising plate portion 22 rising from the base portion 11 and a screw member 23 pressing the reinforcing bar 3 . The pressing portions are provided at a plurality of locations (two locations in this embodiment) and are arranged around the reinforcing bars 3 .

The rising plate portion 22 is configured by one plate portion of an 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 a 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 the plate portions on one side are 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 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 protrude toward the side surface of the reinforcing bar 3 . The screw member 23 has a rod screw portion 23a and a pressing portion 23b. The rod threaded portion 23a is a portion to be screwed into a screw hole, and when it rotates, it protrudes and retracts in the axial direction so that the reinforcing bar 3 can be tightened. The pressing portion 23b is attached to the distal end 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 so that the pad 23c is in close contact with the side surface of the reinforcing bar 3. As shown in FIG. In this embodiment, the contact surface of the pad 23c is flat, but it may be arc-shaped along the side surface of the reinforcing bar 3.

Next, referring to FIG. 4, a method of fixing a post-installed rod-like member using the fixing jig 10 having the above configuration will be described. This fixing method includes a drilling process, a temporary fixing process, a curing process, and a removing process.

As shown in (a) of FIG. 4 , the drilling step is a step of drilling an insertion hole 2 for a reinforcing bar 3 in a concrete structure 1 . In the drilling step, a 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 with the holding portion 21 of the fixing jig 10 in a state in which the filler 4 and the reinforcing bar 3 are inserted into the insertion hole 2 . In this embodiment, the temporary fixing process includes an attaching process, a filling process, a rod-shaped member inserting process, and a rod-shaped member clamping process.

As shown in (b) of FIG. 4 , the mounting process is a process of fixing the fixing jig 10 to the lower surface of the concrete structure 1 . In the mounting step, the fixing jig 10 is fixed by inserting 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 so that the drilled insertion hole 2 and the through hole 13a are coaxial.

As shown in (c) of FIG. 4 , the filling step is a step of filling the insertion hole 2 with the filler 4 . 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-like member inserting step is a step of inserting reinforcing steel bars 3 into the insertion holes 2 . In the rod-shaped member inserting 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 notches 17a are formed in the periphery of the rod-shaped member insertion hole 17, when the fixing plate 5a of the reinforcing bar 3 is pushed, the rod-shaped member insertion hole 17 is expanded. Therefore, the fixing plate 5 a can pass through the lid member 16 .

The order of the mounting step, the filling step, and the rod-shaped member inserting step can be changed. For example, the mounting process may be performed after the filling process and the rod-like member inserting process are performed first. In this case, the projecting portion of the reinforcing bar 3 passes through the notch portion 13b of the base portion 11, and the fixing jig 10 is arranged at a predetermined position. Alternatively, 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. Further, when the filling step is performed after the mounting step and the rod-shaped member inserting step are performed, a nozzle is inserted into the insertion hole 2 from the gap between the through holes 13a on both sides in the width direction of the lid member 16, and the filling is performed. Inject material.

As shown in (e) of FIG. 4 , the temporary fixing step is a step of temporarily fixing the reinforcing bar 3 by holding it with a pair of pressing portions 21 , 21 of the fixing jig 10 . In the temporary fixation 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 portions 21 are arranged on both sides of the reinforcing bar 3, the reinforcing bar 3 is held therebetween. At this time, the pad 23c deforms along the side surface of the reinforcing bar 3 and adheres to the side surface.

The curing step is a step of waiting for the filler 4 to harden while the reinforcing bars 3 are temporarily fixed. In the curing step, wait until the filler 4 develops desired strength.

The removing step is a step of removing the fixing jig 10 from the concrete structure 1 after curing. In the removal process, after releasing the temporary fixation of the reinforcing bars 3 , the anchors 15 are 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 notch portion 13 b of the base portion 11 . When the removing process is completed, the reinforcing bars 3 are fixed in the insertion holes 2 as shown in FIG. 4(f). In the curing process, if the filler 4 has enough strength to prevent the reinforcing bars 3 from falling, the removing process may be started. In this case, part of the curing process and the removal process overlap.

Hereinafter, the effects 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 simply by fixing the base portion 11 to the concrete structure 1 and pressing the reinforcing bar 3 with the holding portions 21 , 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 holding portions 21, 21 are arranged around the reinforcing bar 3, the reinforcing bar 3 can be held in a stable state by sandwiching the reinforcing bar 3 from both sides. can be fixed.

In addition, in this embodiment, the pressing portion 21 includes the screw member 22 that can be projected and retracted toward the side surface of the reinforcing bar 3 , so that the reinforcing bar 3 can be firmly pressed by the screw member 22 . Therefore, the reinforcing bars 3 can be securely held. Furthermore, by changing the protruding/retracting position of each screw member 22, the fixing position and the inclination angle of the reinforcing bar 3 can be adjusted.

Furthermore, in the present embodiment, the insertion portion 13 is provided with the cover member 16 that closes the insertion hole 2. Therefore, in the case of the cement-based filler 4, the mortar in the insertion hole 2 is less exposed to the air and dried. hard to do Therefore, since the wet state of the filler 4 can be maintained, curing can be performed in a favorable environment. Moreover, when the viscosity of the filler 4 is low, it is possible to prevent the filler 4 from sagging. Furthermore, 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. As shown in FIG. 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 anchors 15, the attachment and detachment of the fixing jig 10 can be easily performed. As a result, the workability is improved and the fixing jig 10 can be reused, resulting in excellent 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-described embodiments, and design changes can be made as appropriate 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. Furthermore, 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 semicircular rising plate portion in a plan view.

Further, in the above-described embodiment, the pressing portion 23b is pressed against the reinforcing bar 3 by the screw member 23, but the present invention is not limited to this. For example, the pressing portion 23b may be pressed against the reinforcing bar 3 by a spring. It should be noted that it is preferable to hold the reinforcing bar 3 with the screw member 23 as in the above-described embodiment because the reinforcing bar 3 can be fixed more firmly than with the spring.

Furthermore, in the above-described embodiment, the pressing portions 21 are provided at two locations sandwiching the reinforcing bar 3, but the present invention is not limited to this. For example, it may be provided at three locations so as to surround the reinforcing bar 3, or may be provided at four or more locations. If the pressing portions 21 are installed at three or four locations, 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 with higher accuracy.

Further, in the above-described embodiment, the pressing portion 21 is provided at one height in the axial direction of the reinforcing bar 3, but the present invention is not limited to this. The holding part may be provided at two or more height positions in the axial direction of the reinforcing bar. In this way, especially when the reinforcing bar 3 protrudes from the concrete structure 1 to a large length, the reinforcing bar can be reliably held down, and the positional accuracy of the reinforcing bar can be further improved.

Furthermore, in the above-described embodiment, the fixing jig 10 has been described as an example in which the reinforcing bars 3 are inserted upward, but the fixing jig 10 is not limited to this. The fixing jig 10 according to the present invention can also be applied when temporary fixing is required in order to accurately determine the position of a reinforcing bar during lateral construction.

In addition, in the above-described embodiment, the insertion portion 13 includes the through hole 13a and the notch portion 13b, but is not limited to this. In the case where a fixing plate is not provided on the lower side of the reinforcing bar 3 and the fixing portion is formed by bending the lower end portion, the insertion portion 13 may be formed only by the through hole 13a without providing the notch portion. .

Furthermore, in the above-described embodiment, the fixing jig 10 is fixed to the concrete structure 1 using the screw-shaped anchors 15, but the fixing jig 10 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 work of fixing the fixing jig becomes much easier.

1 Concrete structure 2 Insertion hole 3 Reinforcing bar (bar-shaped member)
4 filler 10 fixing jig 11 base portion 13 insertion portion 16 lid member 17 rod-shaped member insertion hole 21 holding portion 22 rising plate portion 23 screw member

Claims (4)

A fixing jig for temporarily fixing a rod-shaped member inserted into an insertion hole formed in a concrete structure when the rod-shaped member is fixed,
a base fixed to the concrete structure;
a holding portion that holds a rod-shaped member protruding from the insertion hole,
The base portion includes an insertion portion through which the rod-shaped member is inserted,
The insertion portion includes a through hole formed at a center position of the base portion, and a notch portion extending from the through hole to the outer periphery of the base portion, and the through hole is partially cut out. It has a circular shape,
A fixing jig for a post-installed rod-shaped member, wherein the pressing portions are provided at a plurality of locations, are arranged around the rod-shaped member , and are fixed to the base portion . The holding portion includes a rising plate portion rising from the base portion and a screw member screwed into the rising plate portion,
The screw member is provided so as to be retractable toward the side surface of the rod-shaped member, and has a rod screw portion and a pressing portion,
The pressing portion is attached to the tip of the rod screw portion so as to be relatively rotatable,
The fixing jig for the post-applied rod-shaped member according to claim 1, wherein a pad made of an elastic member is provided at the tip of the pressing portion. The insertion portion is provided with a lid member that closes the insertion hole,
The post-installed rod-shaped member according to claim 1 or 2, wherein the cover member is made of an elastic member and has a rod-shaped member insertion hole having a diameter smaller than that of the insertion hole. fixing jig. A method for fixing a post-installed rod-shaped member using the jig for fixing a post-installed rod-shaped member according to any one of claims 1 to 3, comprising:
A drilling step of drilling an insertion hole for the rod-shaped member in the concrete structure;
a temporary fixing step of holding the rod-shaped member protruding from the insertion hole in a state in which the fixing filler and the rod-shaped member are inserted into the insertion hole, by a pressing portion of the fixing jig;
A fixing method for a post-applied bar-shaped member, comprising: a removal step of releasing temporary fixing of the bar-shaped member and removing the fixing jig by sliding it in a lateral direction.

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