JP7137974B2 - Threaded rebar anchor and method for connecting screw rebar using this rebar anchor - Google Patents

Description

The present invention relates to a filler-impregnated tape joint used for connecting reinforcing bars in a reinforced concrete structure (RC structure) building, and a method for connecting reinforcing bars using the filler-impregnated tape joint.

In RC structures, when connecting reinforcing bars embedded in columns and beams, the ends of the two reinforcing bars to be connected are inserted into the cylindrical receiving member, and the gap between the reinforcing bar and the receiving member is inserted. There is a technique to fill the mortar and fix the reinforcing bars together. Conventionally, techniques for improving the efficiency of such reinforcing bar connection work have been proposed, and for example, the technique disclosed in Patent Literature 1 is one of them.

The technique described in Patent Literature 1 preliminarily provides metal fittings that engage with the reinforcing bars inside the receiving member in order to easily temporarily fix the reinforcing bars to be inserted into the receiving member. This metal fitting is formed of a steel material with high spring elasticity, and has a strip-shaped base piece that surrounds the reinforcing bar in the circumferential direction, and a short tongue piece and a long tongue piece that protrude from the base piece along the longitudinal direction of the reinforcing bar. .

Among these, the short tongue is engaged with the inner surface of the receiving member to fix the metal fitting to the receiving member. One of the long tongue pieces engages the outer surface of the inserted reinforcing bar at a plurality of points along the circumferential direction to prevent the reinforcing bar from slipping out. That is, by inserting the reinforcing bar into a substantially ring-shaped metal fitting previously installed inside the receiving member, the long tongue piece bites into the outer surface of the reinforcing bar, exerting a return prevention function to fix the position of the reinforcing bar. After the reinforcing bar is fixed to the receiving member, mortar is filled from the hole provided in the side surface of the receiving member to permanently fix the reinforcing bar.

By using such metal fittings, it is possible to quickly arrange the reinforcing bars at fixed positions on the receiving member, thereby improving the efficiency of connecting the reinforcing bars.

JP-A-10-61106

However, in the above-described conventional method, the work of connecting reinforcing bars is still complicated, such as the need to fill the inside of the receiving member with mortar through the hole provided in the side surface of the receiving member. In addition, there is a possibility that the mortar will not come into contact with the reinforcing bars or the inner surface of the receiving member due to the presence of metal fittings that are highly shape-retaining inside the receiving member, thereby impairing the adhesion effect of the mortar.

In view of such circumstances, conventionally, there has been a demand for a technique for connecting a reinforcing bar and a receiving member using a filler with higher work efficiency.

(characteristic configuration)
The screw reinforcing bar fixing material according to the present invention is formed in a sheet shape while covering the filler with a first protective layer and a second protective layer, and has an adhesive layer on the outer surface of the first protective layer or the second protective layer. , the adhesive layer is further provided with a third protective layer on the outer surface thereof to be removed when the adhesive layer is used.

(effect)
The threaded reinforcing bar fixing material of this configuration can be used, for example, at a location where threaded reinforcing bars arranged on columns and beams of a reinforced concrete structure are connected using a filler such as resin mortar. When connecting screw reinforcing bars, for example, it is necessary to insert two mutually connected screw reinforcing bars into one receiving member and fill the gap between the screw reinforcing bars and the receiving member with a filler. For this reason, the threaded reinforcing bar fixing material of this configuration is temporarily fixed by, for example, being wound around the end of the threaded reinforcing bar, and inserted into the receiving member, thereby facilitating the filling operation of the filling material.

In addition, since the filler material is stretched into a sheet and covered with the first protective layer and the second protective layer, for example, the screw reinforcing bar is inserted into the receiving member and the first protective layer or the second protective layer is applied. is cut off from contact with the outside air until it breaks. Therefore, it is possible to store the screw reinforcing bar fixing material until the connection work of the screw reinforcing bar is performed, and the workability of connecting the screw reinforcing bar can be improved.
Furthermore, by providing the adhesive layer as in this configuration, the screw reinforcing bar fixing material can be attached in advance to the object to be filled with the filler. Therefore, the posture of the object to be connected, such as a screw reinforcing bar, can be arbitrarily set, and the work of arranging the filling material is further facilitated.

(characteristic configuration)
In the screw reinforcing bar fixing material according to the present invention, the filler can be a main agent and a hardening agent separated from each other by a partition layer.

(effect)
In this configuration, the filler is composed of two components, a main agent and a curing agent, and the main agent and the curing agent are separated by a partition layer. Furthermore, the main agent and the curing agent are shielded from the outside by the first protective layer and the second protective layer, respectively. Since the threaded reinforcing bar has a predetermined weight, the threaded reinforcing bar and the receiving member strongly abut each other when the threaded reinforcing bar is inserted into the receiving member. As a result, the screw reinforcing bar fixing material is broken, and the main agent and the hardening agent are efficiently mixed.

Thus, the screw reinforcing bar fixing material of this configuration allows the two-part filling material to be easily placed and efficiently mixed between, for example, the screw reinforcing bar and the receiving member that are connected to each other. For example, it is extremely easy to perform connection work in places where the screwed reinforcing bars are arranged in various directions, and connections are required at high places, which are difficult for workers to reach.

Furthermore, if the filling material is composed of two components, it is possible to set the curing start time of the filling material more accurately, and it is also possible to store the screw reinforcing bar fixing material for a long time, and the efficiency of connecting screw reinforcing bars can be further improved.

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(characteristic configuration)
In the screw reinforcing bar fixing material according to the present invention, the direction along the plane of each of the first protective layer and the second protective layer is the direction in which the tensile strength is minimized. and the second protective layer has a second direction, and the angle formed by the first direction and the second direction is within a preset angle when viewed in a direction perpendicular to the plane. be.

(effect)
In this configuration, the direction in which the tensile strength is minimized is arranged in the near direction for each of the first protective layer and the second protective layer. As a result, for example, when one of the threaded reinforcing bar and the receiving member, to which the threaded reinforcing bar fixing material is attached, is brought into contact with the other member, the direction of the minimum tensile strength is brought close to the contact direction of the members. This makes it easier for the two layers to tear at the same time. Therefore, the main agent and the curing agent can be reliably mixed.

(characteristic means)
In the method for connecting threaded reinforcing bars according to the present invention, an end portion of a threaded reinforcing bar having a male threaded portion on its surface is inserted into a receiving member provided with a female threaded portion to be screwed with the male threaded portion, and the screw is inserted into the receiving member. When connecting the reinforcing bar and the receiving member, the filler is formed into a sheet while being covered with the first protective layer and the second protective layer, and the adhesive layer is formed on the outer surface of the first protective layer or the second protective layer. and a reinforcing bar fixing material provided with a third protective layer, after removing the third protective layer, winding it around the outer surface of the screw reinforcing bar,
It is characterized in that the filler is hardened by breaking the first protective layer and the second protective layer while screwing the screw reinforcing bar into the receiving member.

(effect)
According to this method, the threaded reinforcing bars or the receiving member are temporarily fixed by winding the threaded reinforcing material around them, and then they are connected. Therefore, it is extremely easy to fill the gap between the threaded reinforcing bars and the receiving member with the filling material. In addition, since the filler is covered with the protective layer, contact with the outside air is blocked until the protective layer is damaged, for example, when the screw reinforcing bar is inserted into the receiving member. Therefore, it is possible to store the screw reinforcing bar fixing material until the connection work of the screw reinforcing bar is performed, and the workability of connecting the reinforcing bar can be improved.
In addition, if the threaded reinforcing bar and the receiving member are interlaced with each other, the sliding distance between the male threaded portion of the threaded reinforcing bar and the female threaded portion of the receiving member increases, so the threaded reinforcing bar fixing material is reliably broken. As a result, the degree of mixing between the main agent and the curing agent increases. Furthermore, since a substantially constant-shaped gap is formed spirally between the male screw portion and the female screw portion, the screw reinforcing bar fixing member can easily move along the gap. Therefore, it is possible to reliably fill the filler over the entire length of the threaded region between the male threaded portion and the female threaded portion, thereby obtaining a high-strength connection portion.
Furthermore, by providing the adhesive layer as in this method, the screw reinforcing bar fixing material can be attached in advance to the object to be filled with the filler. Therefore, the posture of the object to be connected, such as a screw reinforcing bar, can be arbitrarily set, and the work of arranging the filling material is further facilitated.

(characteristic means)
In the method for connecting threaded reinforcing bars according to the present invention, the filler includes a main agent and a hardening agent, and the main agent and the hardening agent are separated by a partition layer and stacked in layers, and the main agent and the hardening agent are separated by a partition layer. 1 protective layer, the curing agent is coated with the second protective layer, and by screwing the threaded reinforcing bar into the receiving member , the first protective layer and the second protective layer and It is also possible to break the partition layer and mix and cure the main agent and the curing agent.

(effect)
With this method, the main compound and hardening agent can be kept separate until the threaded rebar is connected, so the threaded rebar fixing material can be stored for a long period of time, and the handleability of the threaded rebar fixing material is improved. . In addition, since the first protective layer or the like that protects the main compound and the hardening agent in a separated state breaks when the screw reinforcing bar and the receiving member come into contact with each other, the main compound and the hardening agent can be easily mixed.

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Explanatory drawing showing the connection mode of the reinforcing bar fixing material and the reinforcing bar according to the first embodiment. Explanatory drawing showing the configuration of the reinforcing bar fixing material according to the first embodiment The perspective view which shows the connection aspect of the reinforcing bar which concerns on 1st Embodiment. Sectional drawing which shows the connection part of the reinforcing bar which concerns on 1st Embodiment Explanatory drawing showing the configuration of the reinforcing bar fixing material according to the second embodiment Explanatory drawing showing a reinforcing bar fixing material in the third embodiment Explanatory drawing showing a connection mode of reinforcing bars according to the fourth embodiment Explanatory drawing showing a connection mode of reinforcing bars according to the fifth embodiment Explanatory drawing showing the winding mode of the reinforcing bar fixing material according to the sixth embodiment.

[First Embodiment]
(Overview)
A reinforcing bar fixing member 3 according to the present invention and a method for connecting reinforcing bars 1a using the reinforcing bar fixing member 3 will be described with reference to the drawings. FIG. 1 shows an example of connecting ends of a screw reinforcing bar 1 to a receiving member 2 . A plurality of threaded reinforcing bars 1 shown in this figure are embedded in columns and beams in an actual RC structure. Therefore, the installation attitude|position of the screw reinforcement 1 is not restricted to a horizontal direction like FIG. 1, but is arbitrary. Alternatively, two separate screw reinforcing bars 1 may be connected together, or the ends of a single annularly shaped screw reinforcing bar 1 may be connected together.

In this embodiment, the male threaded portion 11 formed on the surface of the threaded reinforcing bar 1 is screwed into the female threaded portion 21 formed in the hole portion 22 of the receiving member 2 . At that time, as shown in FIG. Since a gap of a certain shape is formed in a spiral between the male threaded portion 11 and the female threaded portion 21, when the threaded reinforcing bar 1 is screwed into the female threaded portion 21, the reinforcing bar fixing material 3 is placed in the gap. Easy to move along. Therefore, it is possible to reliably fill the filler J over the entire length of the threaded region between the male threaded portion 11 and the female threaded portion 21, thereby obtaining a high-strength connecting portion.

(filler)
FIG. 2(a) shows the configuration of the reinforcing bar fixing member 3. As shown in FIG. This reinforcing bar fixing material 3 is provided with a one-liquid type filler J. As shown in FIG. The filler J is covered with two protective layers and formed into a sheet as a whole. Specifically, the surface of one of the first protective layers 31 is thinly coated with, for example, a filler J having fluidity. The other second protective layer 32 is covered from above, and the first protective layer 31 and the second protective layer 32 are laminated along the periphery of the filler J by, for example, heat sealing or adhesion, as shown in FIG. 2(b). A sealing portion 35 is formed as follows. As a result, the reinforcing bar fixing member 3 with the filler J sealed is obtained.

As the filler J to be used, for example, there is a one-liquid inorganic grout material. As such an inorganic grout material, there is, for example, "Screw Grout Type M3" manufactured by JFE Bar Steel. This grout material is produced, for example, by mixing a powdery grout material and water in a mass ratio of 50:12. This grout material gradually hardens on exposure to air. Therefore, the grout material is applied to the first protective layer 31 in a fluid state after the mixing operation is completed, and then covered with the second protective layer 32 to form the reinforcing bar fixing material 3 .

(protective layer)
The first protective layer 31 and the second protective layer 32 need to be airtight in order to delay hardening of the filler J, and to be broken easily when the screw reinforcing bar 1 is screwed. Although both of these properties are contradictory, a suitable reinforcing bar fixing material 3 can be obtained by considering especially the ease of breakage.

For example, in order to form a resin film that is easily broken, it is conceivable to lower the tensile strength in a specific direction. As such a first material, there is a film produced by stretching the ionomer resin in the longitudinal direction during extrusion production. Such stretching causes the hydrocarbon chains to be oriented in the stretching direction, while the bonds of metal ions having weak bonding strength are generated in the width direction. As a result, the film tends to tear in the width direction.

The second material is a film stretched in the width direction by extruding low-molecular-weight, high-density polyethylene at a low speed and expanding it while increasing the degree of expansion in the width direction. The film thus obtained is easily broken in the width direction.

The third material is, for example, high density polyethylene with a melt mass flow rate (MFR) of 10 or greater. The resulting film becomes brittle and prone to tearing. By the way, MFR means the weight (g) of the resin that flows out from the pores in 10 minutes when the resin is placed in a cylinder and heated to 190° C. and a load of 2.16 kg is applied.

In the reinforcing bar fixing material 3 of this embodiment, the first protective layer 31 and the second protective layer 32 have, for example, different tensile strengths in two non-parallel directions along their planes. In each of the first protective layer 31 and the second protective layer 32 , the direction in which the minimum tensile strength is obtained is aligned with the X direction parallel to one side of the reinforcing bar fixing member 3 .

However, as shown in FIG. 2(b), the minimum tensile strength direction X1 in the first protective layer 31 and the minimum tensile strength direction X2 in the second protective layer 32 need not exactly match. If the angular difference between the directions is within the preset allowable angle α, the first protective layer 31 and the second protective layer 32 will break substantially at the same time. Incidentally, the permissible angle α is, for example, 15 degrees.

These minimum tensile strength directions X1 and X2 are set, for example, in a direction that intersects the extending direction of the thread groove of the male screw portion 11 of the threaded reinforcing bar 1 when the reinforcing bar fixing material 3 is wound around the threaded reinforcing bar 1. Keep By doing so, when the threaded reinforcing bar 1 is rotated, the reinforcing bar fixing member 3 is deformed along the shape of the gap between the two screw grooves and stretched in the minimum tensile strength directions X1 and X2. Fracture is accelerated and the filler J is quickly released.

The thickness of the protective layer formed using such materials is, for example, several tens of microns. The total thickness including the filler J is formed to be about 0.5 mm or thinner. When an adhesive layer N, which will be described later, is added, a thickness of several tens of microns is added.

(adhesive layer)
It is convenient to provide an adhesive layer N on the surface of the first protective layer 31 or the second protective layer 32 . In that case, the surface of the adhesive layer N is covered with a removable third protective layer 33 when the reinforcing bar fixing material 3 is used. By providing the adhesive layer N, the reinforcing bar fixing material 3 can be temporarily fixed, for example, to the surface of the screw reinforcing bar 1 or the receiving member 2, and the posture of the screw reinforcing bar 1 can be arbitrary, and the work of disposing the filler J is facilitated. Become.

(Construction method)
As shown in FIG. 1 , the reinforcing bar fixing material 3 is usually wrapped around the screw reinforcing bar 1 in one layer. When the reinforcing bar fixing material 3 is wound, if the ends of the reinforcing bar fixing material 3 do not reach each other and the surface of the screw reinforcing bar 1 is visible, the filler J is not arranged around the entire circumference of the screw reinforcing bar 1, and the desired connection strength may not be obtained. On the other hand, if the reinforcing bar fixing material 3 is wound in multiple layers, part of the reinforcing bar fixing material 3 may be left outside the receiving member 2 when the screw reinforcing bar 1 is screwed into the receiving member 2 . be. Ideally, the reinforcing bar fixing material 3 should be wound in just one layer. In that case, the total amount of the filler J is defined. Therefore, it is desirable to adjust the amount of the filler J held by the reinforcing bar fixing member 3 in consideration of the size of the gap between the screw reinforcing bar 1 and the receiving member 2 to be connected.

Of the dimensions of the reinforcing bar fixing member 3, the dimension along the longitudinal direction of the screw reinforcing bar 1 is set to a length that allows the screw reinforcing bar 1 to be inserted into the receiving member 2 or slightly longer than that. As a result, an appropriate amount of filler J is filled in the gap between the two. If the expansion coefficient of the filler J is large when the filler J hardens, the length of the reinforcing bar fixing member 3 along the longitudinal direction of the screw reinforcing bar 1 may be shorter than the insertion length of the screw reinforcing bar 1 . Also, as shown in FIG. The insertion depth of the screw reinforcing bar 1 becomes accurate by aligning it with the mark 12 indicating the insertion depth.

As shown in FIG. 3 , the threaded reinforcing bar 1 around which the reinforcing bar fixing material 3 is wound is fitted to the receiving member 2 . When one of the screw reinforcing bars 1 is already installed at a predetermined position, the receiving member 2 is engaged with the screw reinforcing bar 1, and another screw reinforcing bar 1 is screwed. FIG. 4 shows a state in which the two screw reinforcing bars 1 have been connected.

(vent)
In the case of this embodiment, the filling material J is filled inside the receiving member 2 at the same time as the threaded reinforcing bar 1 is screwed together. Therefore, unlike the conventional receiving member 2, it is not necessary to provide the side surface of the receiving member 2 with a filling hole for injecting the filler J after the threaded reinforcing bar 1 is screwed. However, it is preferable to provide a vent hole 23 for discharging the air inside the receiving member 2 . That is, in the case of this embodiment, as soon as the threaded reinforcing bar 1 starts to be screwed into the receiving member 2, the gap between the male threaded portion 11 and the female threaded portion 21 is immediately sealed by the reinforcing bar fixing member 3, and the space inside the receiving member 2 is sealed. becomes a closed space. In that case, there is a possibility that the pressure inside the receiving member 2 increases as the threaded reinforcing bar 1 is screwed, and the filler J is pushed back.

Therefore, as shown in FIGS. 1, 3, and 4, it is preferable to provide at least one ventilation hole 23 at an intermediate position in the longitudinal direction of the receiving member 2, which communicates the female screw portion 21 with the outside. The vent hole 23 may be a conventional hole for injecting the filler J, or may be a hole with a smaller diameter than that.

By using the reinforcing bar fixing member 3 of the present embodiment in this manner, the filler J can be efficiently arranged between the threaded reinforcing bar 1 and the receiving member 2 that are connected to each other. Therefore, even if the connection points and connection directions of the threaded reinforcing bars 1 are various, and the tip of the threaded reinforcing bars 1 is located at a higher place than the worker's position, it is difficult for the worker to reach. However, the connection work becomes extremely easy.

[Second embodiment]
As shown in FIG. 5(a), the filler J of the reinforcing bar fixing material 3 can also be composed of the main agent J1 and the curing agent J2. In this case, a partition layer 34 is provided between the first protective layer 31 and the second protective layer 32 . That is, the main agent J1 is arranged between the partition layer 34 and the first protective layer 31, and the curing agent J2 is arranged between the partition layer 34 and the second protective layer 32. As shown in FIG. 5(b), a sealing portion 35 is formed around the reinforcing bar fixing material 3, in which each layer is joined to each other by fusion or adhesion.

The thicknesses of the first protective layer 31, the second protective layer 32, and the partition layer 34 are each several tens of microns as in the first embodiment. Although the volume of the main agent J1 and the volume of the curing agent J2 may differ, the total thickness including the main agent J1 and the curing agent J2 is formed to be about 0.5 mm or thinner. In addition, when the adhesive layer N is added, the thickness of several tens of microns is added.

In principle, the minimum tensile strength directions of the first protective layer 31, the second protective layer 32, and the partition layer 34 are made to coincide. This is because each layer is more likely to break at the same time when the threaded reinforcing bars 1 are screwed together, and the main agent J1 and the hardening agent J2 are reliably mixed. However, as shown in FIG. 5B, the minimum tensile strength direction X1 in the first protective layer 31, the minimum tensile strength direction X2 in the second protective layer 32, and the minimum tensile strength direction X3 in the partition layer 34 are An exact match is not required. If the angular difference between the directions of each layer is within a preset allowable angle α, the layers are fractured substantially at the same time. Incidentally, the permissible angle α is, for example, 15 degrees.

Furthermore, as shown in FIG. 5A, it is convenient to provide an adhesive layer N on the surface of the second protective layer 32, for example. Of course, it may be the surface of the first protective layer 31 . A removable third protective layer 33 is provided on the surface of the adhesive layer N when the adhesive layer N is used. By providing the adhesive layer N in this way, the reinforcing bar fixing material 3 can be affixed to the threaded reinforcing bar 1 in advance, and the posture of the connecting work of the threaded reinforcing bar 1 can be arbitrary, and the filling work of the filler J is facilitated. Become.

As the filler J to be used, for example, there is “screw grout type Y” which is a two-liquid organic grout material manufactured by JFE Bar Steel. This organic grout material is made by mixing the main agent J1 and the curing agent J2 at a volume ratio of 2:1. If it is a two-liquid type, hardening starts after the connection work of the screw reinforcing bar 1 is completed, so long-term management of the reinforcing bar fixing material 3 is facilitated.

The organic grout material gradually begins to harden when the first protective layer 31 and the like are broken and the base material J1 comes into contact with air. Therefore, in the case of this organic grout material, the curing agent J2 can be used to adjust the curing time. Further, this organic grout material expands when the main agent J1 and the curing agent J2 are cured. Therefore, the gap between the screw reinforcing bar 1 and the receiving member 2 is reliably filled, and a strong connection can be obtained.

By using the reinforcing bar fixing material 3 of the present embodiment, the two-liquid filler J can be easily arranged between the screw reinforcing bar 1 and the receiving member 2 that are connected to each other, and can be efficiently mixed. Therefore, it is extremely easy to perform the connection work in places where the screw reinforcing bars 1 are arranged in various directions, such as the connection points of the screw reinforcing bars 1, and where connection is required at a high place, which is difficult for workers to reach.

[Third embodiment]
As shown in FIGS. 6(a) and 6(b), when a two-liquid filler J is used, the reinforcing bar fixing material 3 can also be configured using a single common protective layer 31a. That is, instead of the above-described first protective layer 31, partition layer 34, and second protective layer 32, a sheet of common protective layer 31a is folded over as a member for holding the main agent J1 and the curing agent J2, and the main agent J1 and curing agent J2 are sandwiched.

In the fabrication, as shown in FIG. 6A, first, the common protective layer 31a having a predetermined length is stretched, and the main agent J1 is applied to a predetermined region near one end. Subsequently, the common protective layer 31a is folded over the main agent J1 to sandwich the main agent J1. Furthermore, after applying the curing agent J2 to the surface of the common protective layer 31a so as to overlap the area coated with the main agent J1, the common protective layer 31a is folded back so as to cover the surface of the curing agent J2. Finally, the overlapping common protective layers 31a are sealed by fusion bonding or adhesion to form a sealing portion 35 in the area around the main agent J1 and the curing agent J2.

As shown in FIG. 6(b), the minimum tensile strength direction X4 of the common protective layer 31a is set, for example, in the X direction along the folding line 36 of the common protective layer 31a. The minimum tensile strength direction X4 is well matched. Of course, the minimum tensile strength direction X4 may be along the Y direction perpendicular to the X direction in FIG.

With this configuration, the number of parts for protecting the filler J is reduced, and the configuration of the reinforcing bar fixing member 3 is simplified. Further, it is possible to easily obtain the reinforcing bar fixing member 3 which is easily broken when the threaded reinforcing bar 1 is screwed.

[Fourth embodiment]
As shown in FIG. 7, a wall portion 24 may be provided at a central position as a receiving member 2 to which two screw reinforcing bars 1 can be connected. With this configuration, each threaded reinforcing bar 1 can be screwed into the wall portion 24 until it abuts on the wall portion 24, and the screwing depth of the threaded reinforcing bar 1 can be easily determined.

As shown in FIG. 7, it is preferable to provide a ventilation hole 23 in the vicinity of the wall portion 24 in each female screw portion 21 . As another configuration, the wall portion 24 may be provided with the second vent holes 23a. In this case, one of the air holes 23 can be omitted. However, when connecting the screw reinforcing bar 1, if the connection work is performed from the female screw portion 21 on the side where the ventilation hole 23 is not provided, the air in the female screw portion 21 on that side first flows through the second ventilation hole 23a. When the other female screw portion 21 is connected after being discharged, the air can be smoothly discharged through the ventilation hole 23 .

However, such ventilation hole 23 and second ventilation hole 23a are not essential components. Even if the reinforcing bar fixing material 3 seals the gap between the male threaded portion 11 and the female threaded portion 21 and air is trapped inside the receiving member 2, the filler J before hardening has a predetermined fluidity. Therefore, by continuing to screw the threaded reinforcing bar 1, part of the air whose pressure has increased pushes the filler J away and is discharged to the outside.

[Fifth embodiment]
As shown in FIG. 8 , prior to screwing the threaded reinforcing bar 1 onto the receiving member 2 , the reinforcing bar fixing member 3 may be inserted into the receiving member 2 and pressed toward the female screw portion 21 . FIG. 8 shows how the screw reinforcement 1 is connected to the receiving member 2 embedded in the ceiling slab 4 . As shown in FIGS. 8(a) and 8(b), only the reinforcing bar fixing member 3 is placed inside the female threaded portion 21, and the reinforcing bar is fixed using a presser bar 5 having an outer diameter smaller than the inner diameter of the female threaded portion 21. Preferably, the material 3 is pressed against the female threaded portion 21 .

However, even if such a presser bar 5 is not used, after inserting the reinforcing bar fixing member 3 into the female threaded portion 21, at least the male threaded portion 11 and the female threaded portion 21 at the open end portion 21a of the female threaded portion 21 are separated from each other. When the reinforcing bar fixing member 3 is sandwiched between the two, the reinforcing bar fixing member 3 is sequentially filled in the gap between the male threaded portion 11 and the female threaded portion 21 by screwing the male threaded portion 11 thereafter. However, the reinforcing bar fixing member 3 is not well filled in the gap between the male threaded portion 11 and the female threaded portion 21 , and the shape of the reinforcing bar fixing member 3 is disturbed and pushed by the end of the threaded reinforcing bar 1 . sometimes pushed into. In this case, by further screwing in the screw reinforcing bar 1, the reinforcing bar fixing member 3 is crushed at the tip of the male threaded portion 11, and the filler J is pushed through the gap between the male threaded portion 11 and the female threaded portion 21. It is pushed out toward the open end 21 a of the female screw portion 21 . By disposing the reinforcing bar fixing material 3 in advance inside the female threaded portion 21 in this manner, the filler J is placed in the gap between the male threaded portion 11 and the female threaded portion 21 as shown in FIG. 8(c). can be reliably filled.

Incidentally, the receiving member 2 in FIG. 8 is already embedded in the ceiling slab 4 when the screw reinforcing bar 1 is interposed from below. Therefore, the receiving member 2 is not provided with the ventilation holes 23 . Even if the reinforcing bar fixing material 3 traps air inside the receiving member 2, the filling material J before hardening can flow so as to release the air, and the threaded reinforcing bar 1 can be screwed without any particular problem. be.

[Sixth Embodiment]
As shown in FIG. 9, the reinforcing bar fixing material 3 may be configured in a roll shape. This reinforcing bar fixing material 3 is wound around the outer surface of the screw reinforcing bar 1 in use. The winding direction or winding pitch of the reinforcing bar fixing material 3 may be determined according to the tear properties of each protective layer used for the reinforcing bar fixing material 3 . For example, when the direction in which the tear strength of the reinforcing bar fixing member 3 is weak is set in the width direction of the reinforcing bar fixing member 3, the reinforcing bar fixing member 3 is formed in a helical shape generally along the direction of the thread groove of the male screw portion 11. It is better to wrap it around By doing so, when the male threaded portion 11 is engaged with the female threaded portion 21, the reinforcing bar fixing member 3 is deformed and stretched in the width direction along the shape of the gap between the screw grooves on both sides, and the reinforcing bar fixing member 3 fracture is promoted.

In addition to this, the manner of winding the reinforcing bar fixing material 3 can be changed according to the shapes such as the pitch of the male threaded portion 11 and the female threaded portion 21 and the depth of the screw groove, the tearing characteristics of the reinforcing bar fixing material 3, and the like. good to change.

Further, the reinforcing bar fixing member 3 may be spirally wound around the male threaded portion 11, or the longitudinal direction of the reinforcing bar fixing member 3 may be perpendicular to the longitudinal direction of the screw reinforcing bar 1, and a plurality of reinforcing bar fixing members 3 may be wound in width units. It may also be wrapped around a point. In any case, if the side edges of the reinforcing bar fixing members 3 at adjacent pitches are not overlapped with each other, the filling material J can be easily filled in the gap between the male threaded portion 11 and the female threaded portion 21, which is preferable.

[Other embodiments]
As the reinforcing bar 1a to be connected, in addition to the threaded reinforcing bar 1, a reinforcing bar 1a having normal joints can be used. In this case, in order to improve the engagement function of the filling material J, it is preferable to provide some kind of concave-convex shape inside the receiving member 2 instead of the female screw portion 21 . In that case, if the expansion coefficient and strength of the filler J to be used are increased, the function of preventing the rebar 1a from slipping out is improved.

INDUSTRIAL APPLICABILITY The reinforcing bar fixing material of the present invention and the method for connecting reinforcing bars using the reinforcing bar fixing material can be widely applied to connecting portions of reinforcing bars in which reinforcing bars are inserted into receiving members and fixed with fillers.

1 screw reinforcing bar 1a reinforcing bar 11 male threaded portion 2 receiving member 21 female threaded portion 22 hole portion 3 reinforcing bar fixing material 31 first protective layer 32 second protective layer 33 third protective layer J filler J1 main agent J2 curing agent N adhesive layer X1 First direction X2 Second direction

Claims (5)

forming a sheet while covering the filler with the first protective layer and the second protective layer;
A screw reinforcing bar fixing material provided with an adhesive layer on the outer surface of the first protective layer or the second protective layer, and further provided with a third protective layer on the outer surface of the adhesive layer to be removed when the adhesive layer is used. The screw rebar fastener according to claim 1, wherein the filler material comprises a base agent and a hardener separated from each other by a partition layer. The first protective layer has the first direction, and the second protective layer has the second direction, as the direction along the plane of each of the first protective layer and the second protective layer in which the tensile strength is the minimum. has
The screw reinforcing bar fixing material according to claim 1 or 2, wherein an angle formed by the first direction and the second direction is within a preset angle when viewed in a direction perpendicular to the plane. When inserting an end of a threaded reinforcing bar having a male threaded portion on its surface into a receiving member having a female threaded portion that screws together with the male threaded portion to connect the threaded reinforcing bar and the receiving member,
A filler is formed in a sheet shape while being covered with a first protective layer and a second protective layer, and a reinforcing bar fixing material provided with an adhesive layer and a third protective layer on the outer surface of the first protective layer or the second protective layer. , after removing the third protective layer, wound around the outer surface of the screw reinforcing bar,
A method for connecting threaded reinforcing bars, wherein the first protective layer and the second protective layer are broken while the threaded reinforcing bars are screwed into the receiving member to harden the filler. The filler has a main agent and a curing agent, and the main agent and the curing agent are separated by a partition layer and stacked in layers, the main agent is covered with the first protective layer, and the curing agent is the second protective layer. is covered with a protective layer,
5. The main agent and the curing agent are mixed and cured by breaking the first protective layer, the second protective layer, and the partition layer by screwing the screw reinforcing bar into the receiving member . How to connect screw rebar as described.

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