JP2002174000A - Construction method for interconnecting reinforcing block at installation site and fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a firm and uniform on-site connection between reinforcements through the site construction work of reinforcing blocks. SOLUTION: The reinforcing block such as a reinforcing bar cage comprises reinforcement 11, a reinforcing frame 13 and reinforcing bars. A part or the whole of the reinforcement 11 of the block is caused to slide on the end of the opposite reinforcement 11 of an adjacent reinforcing block so that the amount of clearance between the ends of both reinforcements 11 is set at a predetermined size or the pressure of contact between both ends is held at a predetermined pressure. Thereafter, the reinforcements are welded together by induction heating or by gas pressure welding, or both reinforcements 11 are connected together by a mechanical connection using female screws or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jointing work at an installation site of a reinforcing steel cage and a connecting wall block used for a reinforcing steel work of a building.

[0002]

2. Description of the Related Art A reinforcing steel cage 10 (FIGS. 10 and 8) used for a reinforcing steel work for a building is constructed by fixing a vertical reinforcing steel 11 to a reinforcing frame 13 with a wire 15 or welding it by arc welding. 14 is wound from the outside of the rebar and bounded by a line, and is manufactured at a fixed length. At the installation site, a process of joining rebar baskets together (FIG. 8) is repeated, and a rebar of a predetermined size is repeated. It has a structure. In the case of the continuous wall block 20 (FIG. 9), the vertical reinforcing bar 11 is fixed to the reinforcing frame 13 and the horizontal reinforcing bar 12 is fixed to the vertical reinforcing bar.
At the installation site, the connecting wall blocks are joined together (FIG. 9) to form a reinforced structure having a predetermined size. The process is the same as that for the reinforced car. Note that the vertical reinforcing bars and the horizontal reinforcing bars are simply referred to as reinforcing bars.

[0003] In recent years, as the damage caused by natural disasters has become severe, the strength of reinforced concrete has been regarded as a problem, and in particular, it has become important to secure the strength of reinforcing steel which affects the strength of reinforced concrete. For this reason, in order to prevent material deterioration of the rebar due to undercut by welding and heavy use of welding, and to reduce the effect of differences in welding skills of workers, welding must be allowed except for joints between rebars on site joints The so-called non-welding method has also been adopted, and the importance of rebar joints has been recognized again.

[0004] A reinforcing bar of a predetermined length is provided with a steel cage and a continuous wall block (hereinafter referred to as a "reinforcing bar") which has been manufactured in advance and transported to the site to be erected. (FIGS. 8 and 9) are combined and completed. Therefore, the greatest effect on the strength of the rebar structure is the in-situ joint of the rebars between the rebar blocks.

[0005] For this reason, in order to ensure sufficient strength of the in-situ joints of the reinforcing bars, the ends of the reinforcing bars of the reinforcing bar block are manufactured so as to be oriented so that all of them are in the same plane. Nevertheless, it is usually due to the fact that the reinforced block must be assembled in a short time outdoors near the construction site, the stiffness of the reinforced block itself is not sufficient, and it has to be transported and erected to the site. As a result, the ends of the reinforcing bars deviate from the same plane state, and the state of contact / gap between the ends of the reinforcing bars facing each other at the site varies (FIGS. 8 and 9). In this case, it is impossible to move the reinforcing bar from the reinforcing frame by a method in which the reinforcing bar is firmly fixed to the reinforcing frame with a wire or by welding by arc welding. It is extremely difficult to adjust the amount and the contact pressure (hereinafter referred to as “end adjustment”).

On the other hand, if the end adjustment can be sufficiently performed so as to meet the predetermined specifications, and as a result, the strength of the in-situ joint portion of the reinforcing bar can be made to be equal to the strength of the reinforcing bar itself. On the other hand, the reinforcing steel structure can withstand a larger load as it is, and can greatly contribute to the reduction of construction costs.

[0007]

SUMMARY OF THE INVENTION Accordingly, it is a main object of the present invention to obtain a strong and uniform in-situ joint in an in-situ jointing operation of a reinforcing bar of a reinforcing bar block.

A further object of the present invention is to provide a metal fitting for fixing a reinforcing bar slidably from another member and a metal fitting for controlling a gap amount and a contact pressure between opposing reinforcing bars.
An object of the present invention is to easily and economically obtain a strong and homogeneous in-situ joint of a reinforcing bar.

[0009]

SUMMARY OF THE INVENTION According to the first aspect of the present invention, there is provided a gap between opposing rebars by sliding rebars at a construction site while allowing the rebars to be displaced when the rebar blocks are transported and erected. By making the amount controllable including the case where the gap amount is zero, it is possible to obtain a strong and uniform in-situ joint portion of the reinforcing bar in the subsequent joining process. The invention described in claim 1 is also applicable to the case of the horizontal reinforcing bar 12 (FIG. 9).

[0010] The invention according to claim 2 of the present application is characterized by using a special fixing bracket for fixing a reinforcing bar to another member such as a reinforcing frame and allowing the reinforcing bar to slide in an axial direction at a construction site. It makes the implementation of the described invention easy and economical.

Further, the invention according to claim 3 of the present application provides a dedicated metal fitting for controlling the gap between the reinforcing bars while sliding the reinforcing bars in the axial direction at the construction site, or the gap between the reinforcing bars and the contact between the reinforcing bars. By using a dedicated metal fitting for controlling the pressure, the invention according to claim 1 can be easily and economically implemented.

The invention according to claim 4 of the present application makes it easier and economical to implement the invention according to claim 1 by using both the fixing bracket according to claim 2 and the dedicated bracket according to claim 3. Is what you want.

The invention described in claim 5 of the present application is a metal fitting used to easily and economically implement the invention described in claim 2 and claim 4, and the invention described in claim 6 and claim 7 is claimed in claim 6. It is another object of the present invention to provide a metal fitting used to implement the invention according to the third and fourth aspects more easily and economically.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 10, in addition to a reinforcing bar 10 having a circular cage cross section, a reinforcing bar block having a rectangular, elliptical or oblong cage cross section and a main reinforcing bar facing each other are shown in FIG. There is a so-called continuous wall block 20 (FIG. 9) or the like that exists only on the surface, but for convenience of explanation, a case of a reinforced car will be described below. Of course, the present invention can be applied to a car having a rectangular, elliptical, or oval cross section or a continuous wall block.

The reinforcing bar cage 10 generally comprises a reinforcing bar 11, a reinforcing frame 13, and a reinforcing bar 14. Reinforcing bars and reinforcing bars are mainly made of steel bars for reinforced concrete (JIS G
3112) is also used, which also has protrusions (knots, ribs)
A deformed steel bar having a shape is used. Mild steel is used for the reinforcing frame. For fixing the reinforcing bar and the reinforcing frame, a wire 15 is used in addition to the welding method by arc welding, and for fixing the reinforcing bar or the reinforcing frame to the reinforcing bar, the wire is used. No. 10 is usually a 10th annealed iron wire (JIS G3532)
(Hereinafter referred to as “bundling wire”).

The invention according to claim 1 of the present application provides the binding wire 15
Is set to a predetermined value so that the reinforcing bar 11 can be slid, and the end portion is adjusted by sliding the reinforcing bar at the time of the on-site connection. In this case, in order to facilitate the setting of the predetermined value, an object having a sliding property and a cushioning property between the binding wire and the reinforcing bar, for example, a metal leaf spring, rubber, plastic,
Wes or the like may be interposed.

However, in this method, it takes a long time to adjust the end portions, and the construction cost is not reduced. Therefore, it is preferable to use dedicated metal fittings. Therefore, the construction method using dedicated metal fittings will be described in detail below.

According to the second and fourth aspects of the present invention, the reinforcing frame 1 shown in FIGS.
After fitting metal fittings 30, 40, and 50 for fixing the reinforcing bar 11 slidably from 3 (hereinafter referred to as “fixing metal fittings”) to the reinforcing steel, the fixing metal fitting is fixed to the reinforcing frame (FIG. 1, FIG.
2, 8, and 9). At this time, the above-mentioned fixing bracket is omitted for two to four rebars of the rebars of the rebar cage 10,
These can be used as reference reinforcing bars for adjusting the linearity / verticality of the reinforcing bar structure. Generally, three or four reinforcing frames are used. As the next step, reinforcing bars are wound around the reinforcing bars and are appropriately fixed to each other with the binding wires 15 (FIG. 10).

The rebar cage 10 thus manufactured is transported to a construction site and erected, and the rebar cage 10 is hung down so that the rebar of the other rebar cage installed earlier and the rebar of the rebar cage can be connected. You. The direction of the reinforcing bars to be joined is usually a vertical direction as shown in the side views of FIGS. 8 and 9, but is not limited thereto. The method according to the invention is also possible in the direction.

Immediately after the rebar cage is placed, the opposing rebars may be in various situations, such as those in contact with each other, those having a too large gap between the rebars, and those having a gap that is too small. (FIGS. 8 and 9).

Therefore, according to the method of the present invention, the ends of the reinforcing bars are adjusted by checking the linearity and verticality of the reinforcing bars using several of the opposing reinforcing bars as reference reinforcing bars, and then the exclusive fixing metal 3 is used.
The remaining rebars are individually slid using 0.40.50 for end adjustment.

Further, a dedicated metal fitting for adjusting the gap amount as shown in FIG. 6 and FIG.
That. ) 70/80 to adjust to a predetermined gap amount, or a dedicated bracket for adjusting the gap amount and contact pressure as illustrated in FIG. 5 (hereinafter, “contact pressure / gap amount adjusting bracket”). The contact pressure and the gap amount are adjusted in consideration of the effect of the weight of the reinforcing bar using the reference numeral 60.

After the above-mentioned end adjustment, the reinforcing bars are welded to each other by welding such as an enclosed welding method in the case of a predetermined gap amount, and the welding is performed by using the contact pressure in the case of a predetermined contact pressure. The rebars can be welded together by a heating method or a gas pressure welding method, or can be mechanically fixed using a mechanical connection using screws or the like. As a result, it is possible to obtain an in-situ joint having low quality and constant strength.

The fixing bracket according to the fifth aspect is, for example, as shown in FIGS. The method of fixing the fixing bracket to the reinforcing frame 13 is not limited to welding, but may be any method as long as a predetermined fixing strength can be obtained. For example, a bolt and nut (FIG. 2) provided on the fitting may be used to fix the fixing bracket. May be fixed to the reinforcing frame. As the fixing bracket, a type in which the nodes of the projections (nodes, ribs) provided on the reinforcing bar are actively used is convenient.

The fixing brackets shown in FIGS. 2 and 3 are provided with notch projections 31 and 41 on the inner surface of a U-shaped member by press working or the like, and the fixing bracket 30 in FIG. 3 are provided in one direction in the axial direction of the reinforcing bar, and the fixing bracket 40 shown in FIG.
And provided in the opposite direction.

The fixing bracket 50 shown in FIG. 4 has a band-shaped push projection 51 provided on the inner surface of a U-shaped member. The pushing protrusion does not need to be formed in a band shape, but may be formed by a simple extrusion process having a head such as a conical shape, a cylindrical shape, an elliptic cylindrical shape, a rectangular shape, or a conical shape.

In FIG. 2, three notch projections 31 are provided in the axial direction of the reinforcing bar 11, but the number thereof can be set to an arbitrary number in consideration of the weight of the reinforcing bar block. The same applies to the case. As the notch projection or the push-in projection, three stripes as shown in FIG. 2 are usually used.
Articles may be provided. The size and pitch of the notch projection and the pushing projection are determined in consideration of the shape and pitch of the nodes of the reinforcing bar. In any case, the reinforcing bar is designed not to fall off easily from the reinforcing frame 13 but to slide from the reinforcing frame when a certain force or more is applied, by using the notch / pressing protrusion and the node provided on the reinforcing bar. ing. The above-mentioned fixing brackets 30, 40, and 50 are formed by machining a U-shaped member. However, as another structure, a metal leaf spring, rubber, silicon rubber is provided on the inner surface of the U-shaped member. An elastic body such as plastic, which is arranged in the same manner as the cutout projection, can be used as needed. Further, as a simple fixing metal, a metal plate spring, double-sided adhesive tape, rubber, silicone rubber, or the like wound around the U-shaped portion of a U-shaped bolt can be used. It should be noted that attaching an adhesive tape, a magnet, or the like to the fixing brackets 30, 40, and 50 makes it convenient to temporarily fix the fixing bracket fitted to the reinforcing bar to the reinforcing frame 13.

The metal fittings (gap adjusting metal fittings) for controlling the gap between the opposing reinforcing bars according to claim 6 include, for example, those shown in FIGS. 6 and 7. The gap adjusting metal fitting 70 shown in FIG. 6 is of a type in which two semi-cylindrical members are used, projections are provided on each inner surface corresponding to the nodes of the reinforcing bar, and the projections are fixed to the reinforcing bar using the nodes of the reinforcing bar. The gap adjusting metal fitting 80 shown in FIG. 7 uses two cylindrical members and has a two-part ring 83 embedded in each inner surface so as to fit the reinforcing bar joint. It is of the type that is fixed to the rebar. It is desirable that notches be formed in the protrusions and a part of the two-part ring so as to avoid ribs of the reinforcing bar (FIGS. 6 and 7). FIGS. 6 and 7 illustrate a case where two sets of protrusions and two sets of two-split springs are provided. The number can be any number. In addition, two semi-cylindrical members are used to embed multiple sets of springs and ball balls on each inner surface, and the spring is used to force the ball balls into and out so that they fit into the nodes of the rebar, and fixed to the rebar. There are also things. The two semi-cylindrical members may be opened and closed by hinges 71, and may be fastened to a reinforcing bar using a stopper 72. Further, if a magnet is fixed to a part of the semi-cylindrical member using a magnet instead of the stopper, and it can be detached by lever operation like a magnet stand when detaching, it is convenient to attach and detach the fitting.

FIG. 5 shows a metal fitting (contact pressure / gap adjusting metal fitting 60) for controlling the gap amount and the contact pressure between the opposing reinforcing bars according to the present invention. In this method, two cylindrical pieces 61 and 62 having an inner diameter corresponding to the outer diameter of the reinforcing bar 11 are fixed by a spring 63, a screw hole is formed in the upper cylindrical piece 61, and a bolt 64 is provided on the upper cylindrical piece 61. In addition, a flanged cylindrical piece 65 slidable and slidable on the lower and side surfaces of the cylindrical piece 62, and a C ring 66 provided on the flanged cylindrical piece. The metal fitting 60 is fitted to the other end of the connecting end of the reinforcing bar, the metal fitting is screwed to the reinforcing steel with a bolt, and the weight of the reinforcing steel is supported using a spring provided in the metal fitting. By utilizing the relationship between the screw position of the metal fitting and the reinforcing bar and the spring force of the spring, the gap between the reinforcing bar and the reinforcing bar facing each other can be controlled, and the contact pressure at the connecting bar of the reinforcing bar can be reduced. The contact pressure can be set to a predetermined value. In the latter case, the contact pressure can be used to facilitate the application of the induction heating method, the gas pressure welding method, and the mechanical connection. In addition, since the lower cylindrical piece and the flanged cylindrical piece are slidable and slidable with each other, the rebar itself can be rotated, and the adjustment of the gap amount and the contact pressure is further facilitated. In addition, an elastic body such as rubber or plastic can be used instead of the spring. In this case, the metal member can be divided into two parts. 6. The two-part type shown in FIG. 7 can also be used.

As described above, FIGS. 2 to 4 show the fixing bracket, FIG. 5 shows the contact pressure / gap adjusting metal, and FIGS. 6 and 7 show the gap adjusting metal. It is not limited.

[0031]

The present invention is embodied in the form described above and has the following remarkable effects.

According to the first aspect of the present invention, the gap between the opposing rebars can be reduced to zero by allowing the rebars to slide arbitrarily at the construction site while allowing the rebars to be displaced when the rebar blocks are transported and erected. Since it can be arbitrarily controlled including the case, the present invention has an effect that in the subsequent joining step, the joining conditions are strictly maintained, and a strong and uniform in-situ joint portion of the reinforcing bar can be obtained. In addition, welding of the reinforcing bar and the reinforcing frame by arc welding becomes unnecessary, and a so-called welding-free construction method becomes possible.

The second aspect of the present invention plays a role in supporting the implementation of the first aspect of the present invention from the side, and a gap between the opposing rebars is provided by using metal fittings for slidably fixing the rebars from other members. Since the amount can be set in a short time, construction can be performed economically, and a more uniform and strong in-situ joint portion of reinforcing steel can be obtained. Also in this case, similarly to the above, welding by rebar welding and the reinforcing frame by arc welding becomes unnecessary, and a so-called welding-free construction method becomes possible.

The third aspect of the present invention plays a role in supporting the implementation of the first aspect of the present invention from the side, and by using a metal fitting which can control the gap amount and the contact pressure between the reinforcing bars arbitrarily. It is possible to set the amount of gap and contact pressure between reinforcing bars to a predetermined value in a short time, and when a predetermined contact pressure is obtained, use the contact pressure to perform induction heating or gas pressure welding. Can be used immediately,
This has the effect that a more uniform and strong in-situ joint of reinforcing steel can be obtained.

The invention described in claim 4 plays a role to further support the implementation of the invention described in claim 1, and the fixing bracket according to claim 2 and the gap adjusting metal fitting or the contact pressure / gap according to claim 3. Since various types of end adjustment methods using the amount adjustment metal fittings can be adopted, the gap amount and contact pressure between the opposing reinforcing bars can be set to a predetermined value in a shorter time, and a more uniform and strong This has the effect that an in-situ joint of the rebar can be obtained.

The inventions of claims 5 to 7 have the effect of providing an easily manufactured and inexpensive metal fitting so that the implementation of the inventions of claims 2 to 4 can be made easier and more economical. In particular, since the metal fittings according to claim 6 and claim 7 can be used repeatedly, it is economical and the construction cost can be further reduced.

[Brief description of the drawings]

[Fig. 1] Fixing bracket, clearance adjustment bracket and contact pressure
It is a perspective view which shows the attachment state of a clearance gap adjustment metal fitting.

FIGS. 2A and 2B are a plan view and a cross-sectional view illustrating an example of a fixing bracket (a cut projection type, part 1).

FIG. 3 is a cross-sectional view showing an example of a fixing bracket (a cut projection type, part 2).

FIG. 4 is a cross-sectional view showing an example of a fixing bracket (press-in type).

FIG. 5 is a perspective view showing an example (spring type) of a contact pressure / gap adjusting metal fitting.

6A and 6B are a plan view and a cross-sectional view illustrating an example of a gap adjusting metal fitting (inner projection type).

FIG. 7 is a plan view and a cross-sectional view illustrating an example (inner ring type) of a gap adjusting metal fitting.

FIG. 8 is a cross-sectional view of a reinforcing bar block made of a reinforcing cage and a side view at the time of site arrangement.

FIG. 9 is a cross-sectional view of a reinforcing bar block by a continuous wall block and a side view at the time of site arrangement.

FIG. 10 is a perspective view showing a general rebar cage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rebar basket 11 Reinforcing bar (vertical rebar) 12 Reinforcing bar (horizontal rebar) 13 Reinforcement frame 14 Reinforcing bar 15 Bundling wire (number line) 16 Field connection point 20 Connected wall block 30 Fixing bracket (cutting projection type, 1) 31 Notch Projection 40 Fixing bracket (cutting projection type, part 2) 41 Cutout projection (cutting projection in the opposite direction to 31) 50 Fixing bracket (band-shaped pushing projection type) 51 Band-shaped pushing projection 60 Contact pressure / gap adjustment metal fitting (Spring type) 61 Upper cylindrical piece 62 Lower cylindrical piece 63 Spring 64 Bolt 65 Flanged cylindrical piece 66 C ring 70 Clearance adjusting bracket (inner projection type) 71 Hinge 72 Stopper 80 Clearance adjusting bracket (inner ring type) 83 split ring

Claims (7)

[Claims] In a case where reinforcing bars of a reinforcing bar block which is slidable in the axial direction and fixed to another member are joined at a construction site, one reinforcing bar block is disposed on another adjacent reinforcing bar block, and A part or all of a reinforcing bar of a reinforcing bar block is moved to approach or contact an opposing reinforcing bar of the other reinforcing bar block, and a method of connecting reinforcing bars is provided. 2. The joining method according to claim 1, wherein the means for slidably fixing the reinforcing bar to another member is a metal fitting for fixing the reinforcing bar to the other member so that the reinforcing bar is slidable in the axial direction. 3. A metal fitting capable of controlling the gap amount between opposing reinforcing bars or a metal fitting capable of controlling the gap amount and contact pressure between opposing reinforcing bars. Joining method 4. The joining method according to claim 1, wherein the metal fitting according to claim 2 and the metal fitting according to claim 3 are used. 5. A metal fitting for use in the invention according to claim 2 and 4, wherein the metal reinforcing rod is slidable in the axial direction and is fixed to another member. 6. A metal fitting used in the third and fourth aspects of the present invention, which makes it possible to control the amount of gap between opposing reinforcing bars. 7. A metal fitting used in the invention according to claim 3 and 4 for controlling the gap amount and contact pressure between opposing reinforcing bars.