JP2009264045A - Reinforcement arrangement construction method of concrete construction beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcement arrangement structure of a concrete construction beam and its construction method excelling in reduction of the amount of reinforcements used and simplification of reinforcement arrangement, and attaining shortening of a time for delivery, quality stabilization and cost reduction by standardization of size without causing problems of structure regulation related to reinforcement joint positions, strength and reliability. <P>SOLUTION: The reinforcement arrangement structure of the concrete construction beam and its construction method are applied to a reinforced concrete construction beam 3 or a steel-framed reinforced concrete construction beam provided along a bearing wall 1. Each of an upper end reinforcement 12 and a lower end reinforcement 13 comprises a pair of hooked reinforcements A1, A2 arranged at both ends of the beam and an intermediate reinforcement B joined thereto. The hooked reinforcements A1, A2 have hooks Aa at one ends, and these hooks Aa are embedded in concrete of a reinforced concrete construction column 2. The hook Aa is a 90° hook, for instance. The hooked reinforcements A1, A2 are prepared as standard items of standard size by a reinforcement manufacturer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reinforcing bar arrangement method for concrete beams in a reinforced concrete building or a steel reinforced concrete building which is an apartment house or the like.

  In general, as shown in FIG. 15, the ends of the main bars 12 and 13 of the reinforced concrete beam 3 are provided with hooks 12 a and 13 a extending in the vertical direction in order to ensure the fixing to the column concrete.

Further, it is stipulated in the structural regulations that a general rebar joint of a large beam is performed at a location where stress is small. For example, as shown in FIGS. 16A and 16B, in both the gas pressure welding joint and the lap joint, the upper bar is in the range of L0 / 2 at the center of the beam, and the lower bar is L0 from the column to the beam formation D. / 4.
JP 2003-239379 Edited by the Architectural Institute of Japan, Guideline for Reinforcement of Reinforced Concrete, 2nd Edition, Published by Architectural Institute of Japan, April 15, 1992

As for the rebar assembling process as described above, in general, each building is cut at a factory, bent, carried to the site, and then assembled.
Conventionally, the reinforced concrete beam provided along the bearing wall also adopts the range of the reinforced joint described above with reference to FIG. 16, so that the length of the building differs depending on the property of the building and the site of use of the building. Things are required. For this reason, after the bar arrangement of the building is completed, an order is made to the reinforcing bar manufacturer, and the production is made to order.
The processing of the hooks 12a and 13a at the reinforcing bar manufacturer requires a bending process after manufacturing a reinforcing bar material having a required size, which is a laborious process. Therefore, it takes time from order receipt to delivery, which hinders the shortening of the construction period of the building. Since it is a made-to-order production, production planning is difficult, and there is also a problem that the operating rate of the processing equipment is lowered due to the uneven ordering time, resulting in uneconomical.

  The object of the present invention is to provide a concrete beam which enables standardization of production by standardization, quality stabilization, shortening of delivery time, and cost reduction without causing problems of structural regulation, strength and reliability related to the position of the reinforcing bar joint. It is to provide a bar arrangement method.

The concrete bar arrangement method of the first configuration of the present invention is a method of constructing a reinforcing bar of a reinforced concrete beam or a steel reinforced concrete beam provided along a bearing wall,
Each main reinforcing bar, which is a reinforcing bar extending in the beam length direction, has a pair of reinforcing bars with anchoring heads arranged at both ends of the beam, and an intermediate reinforcing bar with both ends joined to the pair of reinforcing bars with fixing heads via reinforcing bar joints. The pair of fixing head-attached reinforcing bars has a fixing head at one end, and the fixing head is embedded in the concrete of a reinforced concrete column or a steel reinforced concrete column adjacent to the load-bearing wall,
The reinforcing bar with fixing head is a reinforcing bar with hook having a hook to be the fixing head, and the reinforcing bar with fixing head is selected from a plurality of reinforcing bars with fixing head standardized as a standard It is characterized by using the above.
In this specification, the “bearing wall” includes a “seismic wall”. Further, the length of the reinforcing bar means the length of the portion excluding the fixing head. However, in the case of a linear rebar, the length of the rebar refers to the full length.

According to the bar arrangement construction method of this configuration, a plurality of types of lengths that are standardized as a standard length are prepared for the reinforcing bar with a fixed head, and one selected from them is used. This makes it easy to automate the production line for the production of reinforcing bars with anchoring heads, making it possible to reduce costs and ensure consistent quality through thorough automation, shortening the construction period of buildings by shortening delivery times. Can contribute.
Reinforcing bars with anchoring heads will be joined with intermediate reinforcing bars and reinforcing steel joints, but this invention is applied to reinforced concrete beams or steel reinforced concrete beams provided along the bearing walls. There is no problem of touching the regulations, and there is no problem in structural strength. The arrangement of the reinforcing bar joints defined in the structural regulations is a provision for general beams not adjacent to the bearing walls. In the case of reinforced concrete beams and steel reinforced concrete beams installed along the bearing walls, many stresses are borne by the bearing walls, so the reinforcement of the reinforcing bars in the beams is a problem in terms of strength and reliability. In addition, there is no problem that conflicts with the structural regulations. In other words, in the past, for reinforced concrete beams that are installed along the bearing walls, the position of the reinforced joints should be the same as that of ordinary large beams, or a single continuous reinforcing bar without joints to ensure strength reliability. In terms of this, it is a wasteful overdesign. This invention has been reviewed and optimized for such overdesign, so standardization of production by standardization, quality stabilization, and shortening of delivery time while ensuring strength and reliability. Cost reduction is possible. Further, since the fixing head is made of a hook, processing is easy.

In this bar arrangement method, of the upper and lower bars constituting the main bars, the upper and lower bars located in the same vertical section along the beam length direction have a fixing head at one end of the upper bars. The reinforcing bar and the reinforcing bar with the fixing head at the other end of the lower bar are of the same length, and the reinforcing bar with the fixing head on the same end side of the upper and lower bars has a different length. Also good.
In this case, by preparing two types of reinforcing bars with fixing heads, the positions of the joints of the upper and lower bars can be shifted from each other. In addition, by using the above-described two types of reinforcing bars with fixing heads, the intermediate reinforcing bars can have the same length for both the upper and lower reinforcing bars, resulting in excellent productivity.

In this bar arrangement method, reinforcing bars with fixed heads having the same length may be used for a plurality of reinforced concrete beams or steel reinforced concrete beams having different lengths in one building.
In this way, when the same length of reinforcing bars with anchoring heads is used for a plurality of beams having different lengths in a single building, the number of types of reinforcing bars with anchoring heads to be prepared can be reduced, resulting in higher productivity. , Workability is improved. When rebars with fixed heads of fixed length are used for beams of different lengths, the position of the rebar joints will vary with respect to the beam span, but in the case of beams provided along the bearing walls, The position of the reinforcing bar joint does not matter in terms of strength and reliability, and thus it is reasonable to use reinforcing bars with fixed heads having the same length for a plurality of length beams.

  In addition, with multiple reinforced concrete beams or steel-framed reinforced concrete beams in a single building, with fixed heads that correspond to each other, that is, the positional relationships in the length direction, vertical direction, and width direction within each beam are the same. Reinforcing bars having the same length may be used. In that case, the number of types of reinforcing bars with fixing heads in one building can be reduced. For this reason, productivity improves further.

According to the second embodiment of the concrete beam reinforcing bar arrangement method according to the present invention, the upper and lower ends of the reinforcing bar with the fixing head are formed in a U-shape with the upper and lower bars extending continuously through the bent portion serving as the fixing head. A continuous reinforcing bar is used, and the upper and lower continuous reinforcing bars are selected from a plurality of reinforcing bars with fixed heads that are standardized as a standard length.
In the reinforcing bar arrangement method of the second configuration, each of the main reinforcing bars that are reinforcing bars extending in the beam length direction is a method of applying reinforcing bars of a reinforced concrete beam or a steel reinforced concrete beam provided along the bearing wall. A pair of reinforcing bars with fixing heads arranged at both ends of the beam, and intermediate reinforcing bars joined at both ends to the pair of reinforcing bars with fixing heads through reinforcing bar joints. The fixing head is embedded in the concrete of the reinforced concrete column or the steel reinforced concrete column adjacent to the load-bearing wall at one end of the concrete beam of the first configuration. It is the same as the bar arrangement method.

  As a reinforcing bar with a fixing head, a reinforced concrete beam provided along a load bearing wall also in the case where an upper end and a lower end continuous U-shaped continuous reinforcing bar is used as the upper end and the lower end of the reinforcing head. In the case of steel reinforced concrete beams, by preparing them as standard ones, standardization of production by standardization, quality stabilization, and shortening of delivery time without causing problems of structural regulations, strength and reliability related to the position of the reinforcing steel joints Cost reduction is possible.

According to the third embodiment of the concrete beam reinforcing bar arrangement method of the present invention, the reinforcing bar with a fixing head is a linear shape in which the fixing head is a part extending linearly from the main body of the reinforcing bar and the whole is linear. As the reinforcing bar, the reinforcing bar with a fixing head is selected from a plurality of reinforcing bars with a fixing head that are standardized as a standard. In addition, in the case of the said linear reinforcement, the part embedded in a pillar becomes a fixing head. Further, in the case of this linear reinforcing bar, a plurality of types of reinforcing bars having different overall lengths are prepared and selected from them.
In the reinforcing bar arrangement method of the third configuration, each reinforcing bar that is a reinforcing bar extending in the beam length direction is a method for constructing a reinforcing bar for a reinforced concrete beam or a steel reinforced concrete beam provided along the bearing wall. A pair of reinforcing bars with fixing heads arranged at both ends of the beam, and intermediate reinforcing bars joined at both ends to the pair of reinforcing bars with fixing heads through reinforcing bar joints. The fixing head is embedded in the concrete of the reinforced concrete column or the steel reinforced concrete column adjacent to the load-bearing wall at one end of the concrete beam of the first configuration. It is the same as the bar arrangement method.

  When the column width is wide, the necessary fixing length can be secured even if the fixing head is linear. Reinforced concrete beams or steel reinforced concrete provided along the bearing wall even when the reinforcing head with anchoring head is a linear reinforcing bar with the fixing head extending linearly from the main body of the reinforcing bar. In the case of steel beams, by preparing them as standard ones, standardization of production by standardization, quality stabilization, shortening of delivery time, cost without causing problems of structural regulations, strength and reliability related to the position of rebar joints. Reduction is possible.

According to a fourth aspect of the present invention, there is provided a reinforcing method for a concrete beam having a fixing head with a hook having a hook serving as the fixing head, and the fixing head having a hook with the hook. In a straight state before the part to be bent, a hook selected from a plurality of reinforcing bars with fixing heads standardized as a standard length is used, and the hook is attached to the selected linear reinforcing bar. After bending, the bar arrangement work is performed.
A pair of anchor heads in which the main reinforcement bars, which are reinforcing bars extending in the beam length direction, are the methods of constructing reinforcement bars for reinforced concrete beams or steel reinforced concrete beams provided along the bearing walls. The reinforcing bar with a portion and an intermediate reinforcing bar joined at both ends to the pair of reinforcing bar with fixing head via a reinforcing bar joint, and the pair of reinforcing bar with fixing head has a fixing head at one end and this fixing The point that the head is embedded in the concrete of the reinforced concrete column or the steel reinforced concrete column adjacent to the load-bearing wall is the same as the reinforcing method of the concrete beam of the first configuration.

  In this way, even when the reinforcing bar is prepared in a straight state and is prepared as a standard length, and the hook that becomes the fixing head is bent and processed, the problem of structural provision, strength, and reliability related to the position of the reinforcing bar joint It is possible to standardize production by standardization, to stabilize quality, to shorten delivery time, and to reduce costs. Since bending is performed after selection, productivity is inferior to that in the case of preparing as a standard one with a hook, but the extra hook length can be made free. For this reason, even if the hook extra lengths required for structural design are different, it is possible to use the same standard reinforcing bar.

According to a fifth aspect of the present invention, a concrete beam reinforcing bar mounting method includes a reinforcing bar with a fixing head, a reinforcing bar with a hook having a hook serving as the fixing head, or an enlarged diameter head serving as a fixing head. Prepare rebars with expanded heads, these rebars with hooks and rebars with expanded heads, each with a standard of the same length, with multiple types of lengths that are set to the standard length, One selected from a plurality of types of reinforcing bars with hooks or reinforcing bars with a diameter-enlarged head that are standardized as those of a fixed length is used as a reinforcing bar with a fixing portion constituting a beam.
Reinforced concrete beams or steel reinforced concrete beams arranged along the bearing wall, and a pair of anchored head reinforcing bars in which the main reinforcing bars that are reinforcing bars extending in the beam length direction are arranged at both ends of the beam And a pair of intermediate reinforcing bars joined at both ends to the pair of fixing head-attached reinforcing bars via reinforcing bar joints, and the pair of fixing head-attaching reinforcing bars has a fixing head at one end. It is the same as the concrete bar arrangement method of the concrete beam of the first configuration in that it is embedded in the concrete of the reinforced concrete column adjacent to the bearing wall or the steel reinforced concrete column.

  According to this construction method, a plurality of types of lengths are prepared for each of the reinforcing bars with hooks and the reinforcing bars with a diameter-enlarged head according to the standard of the same length. Therefore, in a beam having the same structural design, a reinforcing bar with a hook and a reinforcing bar with an enlarged head can be freely selected as a reinforcing bar with a fixing head. In this case, since the reinforcing bar with hook and the reinforcing bar with an enlarged head are both prepared as a fixed scale, highly flexible construction can be performed according to inventory and circumstances. In addition, because it is a reinforced concrete beam or a steel reinforced concrete beam provided along the bearing wall, standardization of production by standardization and quality stability without causing problems of structural regulation, strength and reliability related to the position of the reinforced joint , Shorten delivery time, and reduce costs.

  The first embodiment of the concrete bar arrangement method according to the present invention is a method of constructing a reinforcing bar for a reinforced concrete beam or a steel reinforced concrete beam provided along a bearing wall, and extends in the beam length direction. Each main reinforcing bar is a pair of reinforcing bars with fixing heads arranged at both ends of the beam, and an intermediate reinforcing bar with both ends joined to the pair of reinforcing bars with fixing heads through reinforcing bar joints. The reinforcing head with fixing head has a fixing head at one end, and the fixing head is embedded in the concrete of the reinforced concrete column or the steel reinforced concrete column adjacent to the bearing wall. A rebar with a hook having a hook to be the fixing head, and a rebar with a fixing head of a plurality of types standardized as a fixed length to the rebar with a fixing head. For using those selected from, structures according to the reinforcing bar joint position defined intensity, without causing reliability problems, standardization of production by standard dimension of quality stabilization, delivery time, it is possible to reduce costs.

  According to the second embodiment of the concrete beam reinforcing bar arrangement method according to the present invention, the upper and lower ends of the reinforcing bar with the fixing head are formed in a U-shape with the upper and lower bars extending continuously through the bent portion serving as the fixing head. Because it is a continuous rebar, the top and bottom continuous rebars selected from a plurality of rebars with fixed heads that are standardized as standard are used. It is possible to standardize production by standardization, to stabilize quality, to shorten delivery time, and to reduce costs without causing a problem of stability.

  According to the third embodiment of the concrete beam reinforcing bar arrangement method of the present invention, the reinforcing bar with a fixing head is a linear shape in which the fixing head is a part extending linearly from the main body of the reinforcing bar and the whole is linear. Since the reinforcing bar with the fixing head is selected from a plurality of reinforcing bars with a fixing head standardized as a standard, the structural provisions, strength and reliability related to the position of the reinforcing bar joint Without causing problems, it is possible to standardize production by standardization, stabilize quality, shorten delivery time, and reduce costs.

  According to a fourth aspect of the present invention, there is provided a reinforcing method for a concrete beam having a fixing head with a hook having a hook serving as the fixing head, and the fixing head having a hook with the hook. In a straight state before the part to be bent, a hook selected from a plurality of reinforcing bars with fixing heads standardized as a standard length is used, and the hook is attached to the selected linear reinforcing bar. After bending the wire, the bar arrangement work is performed, so that standardization of production, quality stabilization, delivery time reduction, and cost reduction can be achieved without causing structural problems, strength, and reliability problems related to the position of the reinforcing bar joint. It becomes possible.

  According to a fifth aspect of the present invention, a concrete beam reinforcing bar mounting method includes a reinforcing bar with a fixing head, a reinforcing bar with a hook having a hook serving as the fixing head, or an enlarged diameter head serving as a fixing head. Prepare rebars with expanded heads, these rebars with hooks and rebars with expanded heads, each with a standard of the same length, with multiple types of lengths that are set to the standard length, The same structural design is used in order to use one selected from multiple types of reinforcing bars with hooks or reinforcing bars with an enlarged head as the reinforcing bars with fixing heads that make up the beam. In the beam, as a reinforcing bar with a fixing head, a reinforcing bar with a hook and a reinforcing bar with an enlarged head can be freely selected. Since both the reinforcing bars with hooks and the reinforcing bars with enlarged heads are prepared as standard ones, highly flexible construction can be performed according to the stock and situation. In addition, because it is a reinforced concrete beam or a steel reinforced concrete beam provided along the bearing wall, standardization of production by standardization and quality stability without causing problems of structural regulation, strength and reliability related to the position of the reinforced joint , Shorten delivery time, and reduce costs.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1 (A), this concrete beam reinforcement construction method and reinforcement design method are applied to a reinforced concrete beam 3 provided between columns 2 on both sides along a bearing wall 1. . This bearing wall 1 is a seismic wall. The bearing wall 1 and the column 2 are both reinforced concrete, and the wall concrete 5 (FIG. 6) and the column concrete 4 are continuously placed with the beam concrete 6 of the beam 3. The column 2 has column main bars 7 and band bars 8 as reinforcing bars. The load-bearing wall 1 is provided with reinforcing bars 9 in a mesh shape in the vertical and horizontal directions.

  FIG. 7 shows a schematic horizontal cross-sectional view of a multi-storey reinforced concrete apartment house building 11. In this apartment house building 11, each dwelling space 10 arranged in the girder direction is partitioned by a load-bearing wall 1 as a door wall extending in the wife direction. The reinforcing bar structure shown in FIGS. 1 to 6 is applied to the reinforced concrete beam 3 extending along the top and bottom of each of the bearing walls 1.

  In FIG. 1, the reinforced concrete beam 3 has, as a reinforcing bar, an upper bar 12 that is a main bar extending in the beam length direction, a lower bar 13, and a plurality of ribs 14 surrounding the upper bar 12 and the lower bar 13. . At least two upper end bars 12 and lower end bars 13 are provided side by side in the beam width direction. For example, as shown in FIG. 4 (A), even if three upper end bars 12 and three lower end bars 13 are arranged side by side in the beam width direction, as shown in FIG. The number of lower end bars 13 arranged in the beam width direction may be different.

  In FIG. 1, upper and lower reinforcing bars 12 and 13 which are main reinforcing bars, respectively, are a pair of reinforcing bars A1 and A2 with hooks which are arranged at both ends of the beam, and a pair of reinforcing bars A1 and H1 with hooks. It consists of an intermediate rebar B whose both ends are joined to A2 via a rebar joint 15. The pair of hooked reinforcing bars A1 and A2 each have a hook Aa as a fixing head at one end. The hook Aa is a 90 ° hook obtained by bending a reinforcing bar 90 °. The hook Aa is embedded in the column concrete 4 of the reinforced concrete column 2 adjacent to the bearing wall 1. The hook Aa is embedded vertically downward with respect to the upper end line 12 and vertically upward with respect to the lower end line 13. The fixing length, which is the depth at which the hook Aa is embedded in the column concrete 4, is appropriately set in accordance with the structure regulations.

As shown in FIG. 3, the upper bar 12 and the lower bar 13 have a hooked reinforcing bar A1 at one end of the upper bar 12 (the left end in FIGS. 1 and 3) and the other end of the lower bar 13 (FIG. 1, FIG. 1). The hooked reinforcing bar A1 at the right end in FIG. 3 has the same length and the same cross-sectional dimensions. Further, the reinforcing bars A1 and A2 with hooks on the same end side of the upper bar 12 and the lower bar 13 are different in length from each other and have the same cross-sectional dimensions. The intermediate reinforcing bar B has the same length as the upper reinforcing bar 12 and the lower reinforcing bar 13.
It should be noted that the relationship between the hooked reinforcing bars A1 and A2 at the upper end bars 12 and the lower end bars 13 is that the upper end bars 12 and the lower end bars 13 arranged in the width direction are at the same position in the width direction. It is applied between the lower end bars 13. The positions of the reinforcing bar joints 15 are different between the upper end bars 12 and the lower end bars 13 arranged in the width direction. For example, with respect to any one of the upper end bars 12 arranged in the width direction, the shorter hooked reinforcing bar A1 in FIG. 3 is used at one end and the longer hooked reinforcing bar A2 at the other end. In this case, for the upper end bars 12 adjacent to each other in the width direction, the longer hooked reinforcing bar A2 shown in FIG. 3 is used at one end, and the shorter hooked reinforcing bar A1 is used at the other end. As in the case of the upper end reinforcement 12, the short and long hooked reinforcing bars A 1 and A 2 are arranged between the lower end reinforcements 13 adjacent in the width direction.

  As shown in FIG. 16 (A), the position of the reinforcing bar joint 15 connecting the reinforcing bars A1 and A2 with hooks and the intermediate reinforcing bar B is the range of L0 / 2 in the center of the beam (hatched). (L0 is the total length between the columns 2 and 2 of the beam 3), and the bottom bar 13 is between L0 / 4 from the column 2 to the center of the beam starting from the position of the beam formation D (range with hatching) ) Is preferable. This range is a range determined in the case of gas pressure welding in the above-described general reinforced concrete beam, but this range is also preferable in this embodiment. In addition, since it is the reinforced concrete beam 3 along the load-bearing wall 1 and the load-bearing wall 1 bears stress, the position of the reinforced joint 15 does not necessarily have to be the above position, and may be arbitrarily determined.

  Further, in this embodiment, in all the reinforced concrete beams 3 at the positions of the load-bearing walls 1 in the single building described above with reference to FIG. 3, the upper and lower reinforcing bars 12 and 13 are connected to a pair of hooks as shown in FIG. It is assumed that the attached reinforcing bars A1, A2 and the intermediate reinforcing bar B. Further, in the plurality of reinforced concrete beams 3, the hooked reinforcing bars A 1 and A 2 having the same positions are located at the positions corresponding to each other, that is, in the longitudinal direction, the vertical direction, and the width direction in each beam. The same cross-sectional dimensions and the same standards are used.

  In FIG. 1, the reinforcing bar joint 15 includes a lap joint in which an overlapping range 20 a is provided in the reinforcing bar 20 shown in FIG. 5A, and a gas pressure welding joint that joins the end faces 20 b of the reinforcing bars 20 as shown in FIG. Or other welded joints (not shown), or special joints (not shown) such as mechanical rebar joints are used. When using a gas pressure welded joint or a welded joint, the end of the hooked reinforcing bar A and the intermediate reinforcing bar B that are joined to each other is cut slightly at the site (for example, around 10 mm) and joined at the cut surfaces. , To ensure the joining.

As shown in FIG. 1C, the hooked reinforcing bar A (A1, A2) is formed by forming a hook Aa made of a hook by bending at the end of the reinforcing bar main body Ab. Here, the hook Aa made of this hook is bent at 90 °, but may be bent at 135 ° or 180 °. In the case of the hook Aa formed of a 90 ° hook, the hook Aa continues to the reinforcing bar main body Ab through the arcuate portion Aaa at the base end. In this specification, the length L _B of the hooked rebar A, the length of the portion excluding the hook Aa, i.e. a length of rebar body Ab, when the hook Aa consisting of 90 ° hooks of the hook Aa The distance from the bending start point (that is, the bending start position) to the other end. The extra length L _A of the hook Aa refers to the length of the straight line portion.
For the reinforcing bar main body Ab, a deformed reinforcing bar having a protrusion (not shown) on the outer periphery is used. The outer ridges are formed into an annular shape, a spiral shape, or a semi-annular shape that is alternately shifted by 180 °.

In this concrete beam reinforcement construction method and design method, these hooked reinforcing bars A1 and A2 are a plurality of types of hooked reinforcing bars A (A) as standardized as shown in FIG. 2A. _{1 to} A _n ) are used. For example, the standardized reinforcing bars A _{1 to An} are prepared by a reinforcing bar maker or the like, and the standardized reinforcing bars A _{1 to An} are selected in the bar arrangement design in the building manufacturer.

There are at least two types of the length L _B of the hooked reinforcing bar A that is standardized and prepared, but there may be three or more types. For example, it is preferable to use several types (2 to 3 types or about 2 to 4 types). In the case of a general apartment building, the beam length is mostly 7 to 10 m, so if there are two types, the positions of the rebar joints 15 are different between the upper reinforcement 12 and the lower reinforcement 13 as in the example of FIG. Can be made. If the number of types of length is large, it is easy to respond more appropriately according to the building, but the mass productivity of the rebar A with a hook is reduced, and if there are several types, it can be applied to most apartment buildings. . For this reason, it is not necessary to prepare many kinds more than that, and about two to three kinds are preferable. These multiple types of reinforcing bars A with hooks are prepared, for example, having a difference of 0.4 to 1.0 m, for example, a difference of 0.5 m and about 2 to 3 m. In the case of two types with a difference of 0.5 m, for example, 2.5 m and 3.0 m.
The length L _B of the hooked rebar A, as described above, the length of the portion excluding the hook Aa.

Further, in the reinforcing bars A with hooks of each length prepared by standardization, the extra length L _A of the hook A may be one type, but two or more types, for example, 3 as shown in FIG. It is preferable to make the type. The surplus length L _A is the length of the straight portion of the hook A.
The extra length L _B of the reinforcing bar hook A at the beam-column joint is, for example, 10d (d is the diameter of the reinforcing bar) in the case of the 90 ° hook, but the extra length is regulated by various factors in the building regulations. ing. For example, it is regulated by the reinforcing bar diameter, the type of reinforcing bar (steel type), concrete strength, and the like. If about three types of extra length L _B are prepared for such regulations, the optimum extra length can be selected for any part of concrete strength or the like.
Note that the above description of the types of reinforcing bars is for the case where the diameters of the reinforcing bars are the same, and the reinforcing bars A with hooks prepared by standardization are of the above-mentioned types for each thickness (reinforcing bar diameter d). It is preferable to prepare. Further, in addition to the thickness, the above-mentioned length types may be prepared for each material.

  According to the bar arrangement structure, bar arrangement construction method, and design method of this structure, the upper bar 12 and the lower bar 13 which are the main bars are a pair of hooked reinforcing bars A (A1, A2) arranged at both ends of the beam. And the intermediate rebar B joined between them, and the rebar A with a hook is a standard one, that is, a standardized one. This makes it easy to automate the production line, making it possible to reduce costs and ensure consistent quality through thorough automation, and contribute to shortening the construction period of the building by shortening the delivery time. Since the hook Aa of the reinforcing bar A with a hook is a 90 ° hook, it can be easily processed from a reinforcing bar material.

  The reinforcing bar A with the hook is connected to the intermediate reinforcing bar B and the reinforcing bar joint 15. However, since this embodiment is applied to the reinforced concrete beam 3 provided along the bearing wall 1, the arrangement of the reinforcing bar joint 15 is structured. There is no problem of touching the regulations, and there is no problem in structural strength. That is, in the case of the reinforced concrete beam 3 provided along the bearing wall 1, it does not belong to a pure column beam structure, and the stress acting on the reinforced concrete beam 3 is not greatly different at any position in the beam length direction. Therefore, even if the reinforcing bars are joined at an arbitrary position, there is no problem in strength and reliability. The arrangement of the reinforcing bar joints defined in the structural rules is a rule for general beams not adjacent to the bearing walls. Conventionally, reinforced concrete beams that are installed along the load-bearing walls are either located at the same position as a general large beam or as a single continuous rebar without joints, but this ensures strength reliability. In terms of this, it is a wasteful overdesign. Moreover, it is difficult to improve the quality of long rebars having hooks at both ends due to difficulty in automation. The present invention has been reviewed and optimized for such excessive design, so it is possible to shorten delivery time, ensure quality, and reduce costs through standardization while ensuring strength and reliability. It becomes.

  For each upper bar 12 and lower bar 13 constituting the main bar, the hooked reinforcing bar A1 at one end of the upper bar 12 and the hooked reinforcing bar A1 at the other end of the lower bar 13 have the same length and the same cross-sectional dimension. Since the hooked reinforcing bars A1 and A2 on the same end side of the upper and lower reinforcing bars 12 and 13 have different lengths, two types of hooked reinforcing bars A1 and A2 are prepared. The positions of the joints of the upper muscle 12 and the lower muscle 13 can be shifted from each other. Further, by using the two types of hooked reinforcing bars A1 and A2, the intermediate reinforcing bar B can have the same length for the upper reinforcing bar 12 and the lower reinforcing bar 13 and is excellent in productivity.

  In this embodiment, the upper reinforcing bars 12 and the lower reinforcing bars 13 which are the main reinforcing bars in the plurality of reinforced concrete beams 3 in one building 11 are the pair of hooked reinforcing bars A1 and A2 and the intermediate reinforcing bar B. The hooked reinforcing bars A1 and A2 corresponding to the same positions in the plurality of reinforced concrete beams 3 have the same length and the same cross-sectional dimensions. For this reason, the number of types of hooked reinforcing bars A1 and A2 in one building 11 can be reduced. For this reason, productivity improves further.

  In the above embodiment, the case where the present invention is applied to the reinforced concrete beam 3 along the load-bearing wall 1 of the same width of one building has been described. However, the present invention is, for example, as shown in FIG. The present invention can also be applied to a case where there are a plurality of types of load bearing walls 1A and 1B with different reinforced concrete beams 3 along the entire length of the load bearing walls 1A and 1B. In this case, the lengths of the reinforcing bars A1 and A2 with hooks are the same for the upper and lower bars 12 and 13 of the reinforced concrete beams 3 provided along the bearing walls 1A and 1B having different widths. Only the length of the intermediate rebar B may be varied.

  In addition, as shown in FIG. 8B, when one reinforced concrete beam 3 is provided across the bearing walls 1 on both sides where the pillar 2A exists in the middle, the middle pillar 2A portion is shown in FIG. As shown, the upper reinforcing bars 12 and the lower reinforcing bars 13 may be provided through the intermediate rebar B through the column 2A and the hooked reinforcing bars A1 and A2 are joined to both sides thereof as shown in FIG.

In addition, although the said embodiment demonstrated about the case where all were applied to the reinforced concrete beam, this invention can also be applied to a steel frame reinforced concrete beam. When applied to a steel-framed reinforced concrete beam, it is also applied when it is provided along a bearing wall.
FIG. 10 shows an example applied to a steel-framed reinforced concrete beam. The column 2 'and the beam 3' are composed of a steel column 21 and a steel beam 23 made of H-shaped steel and the like, and a reinforced concrete portion provided around the column. Is done. The steel column 21 and the steel beam 23 are joined to each other. Reinforcing bars in the reinforced concrete portion of the column 2 'and the beam 3' are the same as those of the column 2 and the beam 3 shown in FIG. Further, in FIG. 10, the shapes of the steel column 21 and the steel beam 23 are illustrated in a simplified manner.

  FIG. 11 shows a reinforcing bar arrangement method for a concrete beam according to another embodiment of the present invention. In this method, as shown in FIG. 5A, as the reinforcing bar with the fixing head, the beam 3 having the hooked reinforcing bar A (A1, A2) having the hook Aa serving as the fixing head, and FIG. This is a construction method that can be selectively constructed on a beam 3 using a rebar A ′ (A1 ′, A2 ′) with an enlarged head having an enlarged head Aa ′ as a fixing head shown.

  The rebar A ′ having an enlarged head has a conical or circular flange-shaped enlarged head Aa ′ formed by plastic working at the end of the rebar main body Ab. The plastic working of the enlarged head Aa ′ is performed by, for example, high-frequency induction heating of one end of a reinforcing bar material manufactured or cut to a predetermined dimension (a dimension slightly longer than the reinforcing bar A ′ with an enlarged head), It is performed by compressing with, for example. In addition, the diameter-enlarged head Aa ′ may be obtained by joining a member separate from the reinforcing bar main body Ab to the reinforcing bar main body Ab by welding or other joining methods.

As shown in FIGS. 4C and 4D, a plurality of types of the reinforcing bar A with a hook and the reinforcing bar A ′ with an enlarged head are standardized with the same length. Prepare one of each length.
One selected from a plurality of types of reinforcing bars A with hooks or reinforcing bars A ′ with an enlarged head, which are standardized as those of a fixed length, is used as a reinforcing bar with a fixing portion constituting the beam 3. It should be noted that the reinforcing bar with hook A and the reinforcing bar with enlarged diameter head A ′ have a standard that the reinforcing bar length L _B is the same length except for the fixing heads Aa and Aa ′.

According to the construction method of this embodiment, in a beam having the same structural design, a reinforcing bar A with a hook and a reinforcing bar A 'with an enlarged head can be freely selected as the reinforcing bar with a fixing head. In this case, since the reinforcing bar A with hook and the reinforcing bar A ′ with an enlarged head are both prepared as a fixed scale, highly flexible construction can be performed according to inventory and circumstances. In addition, because it is a reinforced concrete beam 3 or a steel reinforced concrete beam provided along the bearing wall 1, standardization of production by scaling without causing problems of structural regulation, strength and reliability related to the position of the reinforced joint, It is possible to stabilize quality, shorten delivery time, and reduce costs.
Other configurations and effects are the same as those of the first embodiment shown in FIGS.

FIG. 12 shows a concrete bar arrangement method according to still another embodiment of the present invention. In this method, the upper and lower end continuous reinforcing bars A ″ (A1 ″) of the reinforcing head with the fixing head are connected to the upper end A ₁₂ and the lower end A _{13 in} a U shape via the bent portion Ac serving as the fixing head. , A2 ″). In the upper / lower continuous reinforcing bar A ″, the lengths of the upper end A ₁₂ and the lower end A ₁₃ are different from each other by 400 mm or more, for example, about 500 mm. As the upper / lower continuous reinforcing bar A ″ (A1 ″, A2 ″), one selected from a plurality of upper / lower continuous reinforcing bars A ″ standardized as a standard is used. Incidentally, upper-lower continuous rebar A1 at both ends ", A2" is using the same one another, in the upside down to each other, lower muscle upper muscle portion A ₁₂ for upper-lower continuous rebar A1 "end It is shorter than the portion A ₁₃ , and the upper end stripe portion A ₁₂ is longer than the lower end stripe portion A ₁₃ for the upper end / lower end continuous reinforcing bar A 2 ″ at the other end.
In this case, the plurality of upper and lower continuous rebars A ″ that are standardized as a standard length may have a plurality of types or a single type, and a plurality of different extra lengths L _A. Prepare one of the types, and use the upper and lower end continuous rebar A ″ having an appropriate extra length L _A according to the beam formation.

Thus, as the reinforcing bar with the fixing head, the upper end / lower end continuous reinforcing bar A ″ in which the upper end A ₁₂ and the lower end A ₁₃ continue in a U shape via the bent portion Ac serving as the fixing head is used. Even in the case of a reinforced concrete beam or steel reinforced concrete beam provided along the bearing wall, by preparing as a standard one, without causing structural problems, strength, reliability problems related to the position of the reinforced joint, Standardization of production by standardization, quality stabilization, delivery time reduction, and cost reduction are possible.
Other configurations and effects are the same as those of the first embodiment shown in FIGS.

  FIG. 13 shows a concrete beam reinforcement construction method according to still another embodiment of the present invention. In this method, the fixing head-attached reinforcing bar is a linear reinforcing bar AA in which the fixing head AAa is linearly extended from the reinforcing bar main body, and the fixing head is the linear reinforcing bar AA. As the attached reinforcing bar, one selected from a plurality of linear reinforcing bars AA standardized as a standard length is used. In this case, the portion embedded in the column 2 in the linear reinforcing bar AA becomes the fixing head AAa.

In a building such as an apartment house, the width W of the pillar 2 adjacent to the bearing wall 1 may be designed to be as wide as about 2 m, for example. When such a column width is wide, a necessary fixing length can be secured even if the fixing head AAa is linear.
As described above, even when the reinforcing head-attached reinforcing bar is a linear reinforcing bar AA, in the case of the reinforced concrete beam 3 or the steel-framed reinforced concrete beam provided along the bearing wall 1, the reinforcing bar is prepared as a fixed length. Standardization of production by standardization, quality stabilization, shortening of delivery time, and cost reduction can be achieved without causing problems of structural definition, strength, and reliability related to the position of the joint 15. Other configurations and effects are the same as those of the first embodiment shown in FIGS.

  FIG. 14 shows a concrete beam reinforcing bar installation method according to still another embodiment of the present invention. In this embodiment, the reinforcing bar with a fixing head is a hooked reinforcing bar A (A1, A2) having a hook Aa as a fixing head. AB is assumed to be in a linear state before the portion to be the hook Aa is bent. One selected from a plurality of reinforcing bars AB with fixing heads, which is standardized as a linear and fixed scale, is used.

  Thus, even when the reinforcing bar AB is prepared in a straight state as a fixed scale, and the hook Aa serving as the fixing head is bent after being selected, the structural regulation, strength, Standardization of production by standardization, quality stabilization, shortening of delivery time, and cost reduction are possible without causing problems of reliability. Since bending is performed after selection, productivity is inferior compared to the case of preparing as a standard with the hook Aa, but the hook extra length can be made free. Therefore, even if the hook extra lengths required for structural design and the like are different, the same length of the reinforcing bar AB can be used. Other configurations and effects are the same as those of the first embodiment shown in FIGS.

(A) is a fracture front view of a reinforcing bar showing a reinforced concrete beam constructed by the construction method according to one embodiment of the present invention and its surrounding structure, (B) is an enlarged view of a part of FIG. 1, (C) These are explanatory drawings of the reinforcing bar with a fixing part to be prepared. It is explanatory drawing of the kind of reinforcing bar with a fixing part prepared as a fixed scale thing. It is explanatory drawing of the upper bar and the lower bar in the same reinforced concrete beam. It is explanatory drawing of the example of arrangement | positioning of the upper bar and the lower bar in the cross section of the same reinforced concrete beam. (A), (B) is explanatory drawing which shows each example of a rebar joint, respectively. It is a fracture perspective view which shows the reinforced concrete beam of FIG. 1, and its surrounding structure. It is a schematic horizontal sectional view which shows an example of the apartment house building using the same reinforced concrete beam. It is a schematic horizontal sectional view which shows each modification of the building to which the same reinforced concrete beam is applied. It is a front view of the bar arrangement which shows the relationship between the column in the middle of a beam, and a reinforcing bar. It is a fracture | rupture front view which shows the steel frame reinforced concrete beam constructed | assembled by the construction method concerning other embodiment of this invention, and its surrounding structure. It is explanatory drawing of the construction method concerning other embodiment of this invention. It is explanatory drawing of the construction method concerning other embodiment of this invention. It is explanatory drawing of the construction method concerning other embodiment of this invention. It is explanatory drawing of the construction method concerning other embodiment of this invention. It is explanatory drawing of a prior art example. It is explanatory drawing of structure prescription | regulation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bearing wall 2 ... Column 3 ... Reinforced concrete beam 3 '... Steel-framed reinforced concrete beam 10 ... Dwelling space 11 ... Apartment house building 12 ... Top bar 13 ... Bottom bar 14 ... Stirrup 21 ... Steel column 23 ... Steel beam A, A1, A2, An ... Rebar with hook (rebar with anchoring head)
Aa ... Hook (fixing head)
A ', A1', A2 '... Reinforcing bar with expanded head (rebar with anchoring head)
Aa '... Diameter-expanded head (fixing head)
A "... Upper and lower end continuous rebar (rebar with anchoring head)
Ac ... bent part (fixing head)
A ₁₂ ... upper end bar A ₁₃ ... lower end bar AA ... linear reinforcing bar (rebar with anchoring head)
AB ... Rebar with fixing head B ... Intermediate rebar

Claims (7)

A method for constructing a reinforcing bar of a reinforced concrete beam or a steel reinforced concrete beam provided along a bearing wall,
Each main reinforcing bar, which is a reinforcing bar extending in the beam length direction, has a pair of reinforcing bars with anchoring heads arranged at both ends of the beam, and an intermediate reinforcing bar with both ends joined to the pair of reinforcing bars with fixing heads via reinforcing bar joints. The pair of fixing head-attached reinforcing bars has a fixing head at one end, and the fixing head is embedded in the concrete of a reinforced concrete column or a steel reinforced concrete column adjacent to the load-bearing wall,
The reinforcing bar with a fixing head is a reinforcing bar with a hook having a hook to be the fixing head,
Reinforcing method for concrete beam, wherein the reinforcing bar with a fixing head is selected from a plurality of types of reinforcing bars with a fixing head that are standardized as a standard length. .   2. The upper and lower bars located in the same vertical section along the beam length direction among the upper and lower bars constituting the main bars are the reinforcing head-attached reinforcing bars at one end of the upper bars. Concrete where the reinforcing bar with the fixing head at the other end of the bottom bar has the same length as each other, and the reinforcing bar with the fixing head on the same end side of the upper bar and the lower bar has a different length from each other Reinforcing bar construction method.   3. Reinforcement construction of concrete beams using reinforcing bars with fixed heads of the same length on a plurality of reinforced concrete beams or steel reinforced concrete beams of different lengths in one building in claim 1 or claim 2. Method. A method for constructing a reinforcing bar of a reinforced concrete beam or a steel reinforced concrete beam provided along a bearing wall,
Each main reinforcing bar, which is a reinforcing bar extending in the beam length direction, has a pair of reinforcing bars with anchoring heads arranged at both ends of the beam, and an intermediate reinforcing bar with both ends joined to the pair of reinforcing bars with fixing heads via reinforcing bar joints. The pair of fixing head-attached reinforcing bars has a fixing head at one end, and the fixing head is embedded in the concrete of a reinforced concrete column or a steel reinforced concrete column adjacent to the load-bearing wall,
The rebar with the fixing head is a standard upper end and lower end continuous rebar with the upper end and the lower end continuous in a U-shape through the bent part that becomes the fixing head. A method for reinforcing bar arrangement for concrete beams, characterized by using one selected from a plurality of reinforcing bars with fixing heads. A method for constructing a reinforcing bar of a reinforced concrete beam or a steel reinforced concrete beam provided along a bearing wall,
Each main reinforcing bar, which is a reinforcing bar extending in the beam length direction, has a pair of reinforcing bars with anchoring heads arranged at both ends of the beam, and an intermediate reinforcing bar with both ends joined to the pair of reinforcing bars with fixing heads via reinforcing bar joints. The pair of fixing head-attached reinforcing bars has a fixing head at one end, and the fixing head is embedded in the concrete of a reinforced concrete column or a steel reinforced concrete column adjacent to the load-bearing wall,
The rebar with the fixing head is a straight rebar with the fixing head as a part extending linearly from the rebar main body, and is standardized as a fixed length with the rebar with the fixing head. A method for laying a concrete beam, comprising using a plurality of reinforcing bars with fixed heads. A method for constructing a reinforcing bar of a reinforced concrete beam or a steel reinforced concrete beam provided along a bearing wall,
Each main reinforcing bar, which is a reinforcing bar extending in the beam length direction, has a pair of reinforcing bars with anchoring heads arranged at both ends of the beam, and an intermediate reinforcing bar with both ends joined to the pair of reinforcing bars with fixing heads via reinforcing bar joints. The pair of fixing head-attached reinforcing bars has a fixing head at one end, and the fixing head is embedded in the concrete of a reinforced concrete column or a steel reinforced concrete column adjacent to the load-bearing wall,
The reinforcing bar with a fixing head is a reinforcing bar with a hook having a hook to be the fixing head,
As the reinforcing bar with the fixing head, one selected from a plurality of reinforcing bars with a fixing head, which is standardized as a standard, in a linear state before the hook portion is bent. ,
A concrete bar arrangement method, comprising: bending the hook on the selected linear reinforcing bar and then performing a bar arrangement work. A method for constructing a reinforcing bar of a reinforced concrete beam or a steel reinforced concrete beam provided along a bearing wall,
Each main reinforcing bar, which is a reinforcing bar extending in the beam length direction, has a pair of reinforcing bars with anchoring heads arranged at both ends of the beam, and an intermediate reinforcing bar with both ends joined to the pair of reinforcing bars with fixing heads via reinforcing bar joints. The pair of fixing head-attached reinforcing bars has a fixing head at one end, and the fixing head is embedded in the concrete of a reinforced concrete column or a steel reinforced concrete column adjacent to the load-bearing wall,
The rebar with the fixing head is a rebar with a hook having a hook to be the fixing head, or a rebar with an enlarged head having an enlarged head to be a fixing head,
For each of these rebars with hooks and rebars with expanded heads, we prepare each of a plurality of types of lengths that are standard in the same length,
Concrete selected from a plurality of types of rebars with hooks or rebars with expanded heads that are standardized as these standard lengths, and used as rebars with fixing parts constituting the beam Reinforcing bar construction method.

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