JP4744027B2 - Foundation reinforcement structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bar arrangement structure that facilitates bar arrangement at a site where main bars arranged on a basic module intersect in a straight line direction or an orthogonal direction when constituting the foundation of a building.
[0002]
[Prior art]
In a reinforced concrete (RC) foundation of a low-rise industrialized house (prefabricated house), it is common to use an assembled reinforcing bar in which a plurality of main bars are connected in advance by a stirrup at the factory stage. Then, this rebar is placed in a basic module of the target prefabricated house and set in advance, and then a formwork is installed around the placed rebar and concrete is placed in this formwork. Configured.
[0003]
The rebars used in the RC foundation have at least four main bars (transverse bars) and are connected to the main bars by ribs formed in a substantially rectangular loop shape. There are unit rebars arranged in a lattice plate by arranging multiple main bars in a row and connecting them by straight ribs, and these saddle-type rebars and unit rebars can be built in houses to be built The foundation is constructed by selectively using it according to the applied load and ground conditions.
[0004]
In the assembled rebar, the amount of main bars and the amount of stirrups connecting the main bars are set so as to satisfy the amount of reinforcing bars required as a result of structural calculation. In general, the arrangement position of the streaks relative to the main streaks is matched with the basic module set in the building.
[0005]
For example, the technique disclosed in Japanese Patent Application Laid-Open No. 07-054353 relates to a bar arrangement structure of a slab foundation, and a stirrup bar in a beam bar unit having a stirrup bar (a rib bar) is a basic module of a building. Are arranged at equal intervals according to the dimensional position with reference unit as the reference unit. And by using such a beam reinforcement unit as a reinforcing bar for the foundation beam, the lateral reinforcement of the slab foundation is aligned with the stirrup so that it can be arranged without any special marking. is there.
[0006]
Next, an example in the case of installing an assembly reinforcing bar arranged so that the stirrups coincide with the basic module will be described with reference to the drawings. 4 (a), 4 (b), and 5 show a grid plate unit reinforcing bar 51 formed by connecting main bars 51a by loose bars 51b arranged in series on a building basic module 52, or in a T-shape. An example of connection to is shown.
[0007]
As shown in the figure, the ribs 51b constituting each unit reinforcing bar 51 are close to each other at the intersection 53 where the plurality of unit reinforcing bars 51 intersect. In particular, at the intersection 53 of the unit reinforcing bars 51 arranged in two orthogonal directions, the three stirrups 51b approach each other, and the fixing bars 54 are arranged along the main bars 51a. For this reason, a large number of rebars are combined in a complicated manner at the intersection part 53.
[0008]
FIG. 6C shows an example in which the unit reinforcing bars 51 and 51 are connected in a cross shape from the orthogonal direction to the unit reinforcing bars 51 arranged in one direction. Even in this case, the stirrups 51b constituting the unit reinforcing bars 51 arranged in each direction are concentrated at the intersecting portion 53 of the unit reinforcing bars 51 in each direction.
[0009]
FIG. 6 shows an example in which a hook-shaped rebar 55 configured in a bowl shape by connecting main bars (horizontal bars) 55a with loop-shaped ribs 55b is arranged on a basic module of a building and connected in a T-shape. is there. As shown in the figure, at the crossing portion 53 where the saddle-shaped reinforcing bars 55 in two directions intersect, the ribs 55b provided at the end of the saddle-shaped reinforcing bar 55 on the abutting side fit into the penetrating-side saddle reinforcing bar 55 Since both interfere with each other, it is impossible to connect in this state, and it is necessary to adjust the length of the main bar at the end and the position of the stirrup 55b to be arranged at the end. is there.
[0010]
[Problems to be solved by the invention]
As described above, in the unit rebar 51 and saddle-type rebar 55 configured by matching the stirrups to the basic module, the stirrups of the rebars 51 and 55 approach each other at the intersection 53 and the concrete is placed. When this occurs, there is a risk that this concrete will not be sufficiently filled in the narrow portion.
[0011]
For this reason, in the unit rebar 51 and the saddle-type rebar 55 arranged at the intersection, the terminal is cut in advance or the position of the stirrup is shifted. It is necessary to shift the position of. If the unit rebar 51 and saddle type rebar 55 that were reasonably manufactured in advance at the factory stage are further processed as described above, or if they are devised at the time of bar arrangement, workability will be inferior, and it is not an effective means. There's a problem.
[0012]
It is an object of the present invention to provide a basic bar arrangement structure in which, when the bars are arranged, the streaks are not concentrated at the connecting part or the crossing part of the reinforcing bars, and no extra processing is required for the connecting part or the crossing part. Is to provide.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the bar arrangement structure of the foundation according to the present invention is a foundation in which the main bar is arranged on the basic module of the building, and the installation position of each stirrup bar in the assembled reinforcing bar or the vertical reinforcing bar is The position is set to be displaced by 1/2 pitch with respect to the basic module of the building.
[0014]
In the basic bar arrangement structure, it is preferable that the main reinforcing bar of the assembly reinforcing bar is set to a length that is an integral multiple of the basic module of the building.
[0015]
In the above-mentioned basic bar arrangement structure, the ribs of the assembly rebar or saddle type rebar (hereinafter referred to as “assembly rebar”) are set at a position displaced by 1/2 pitch with respect to the basic module. When arranged on the basic module, each stirrup is not arranged on the basic module, but is arranged at a position displaced by 1/2 pitch from the basic module, and both end portions of the main reinforcing bar in the assembled reinforcing bar are staggered. Is in a free end state without being arranged.
[0016]
Therefore, when connecting the assembled reinforcing bars in series, the free ends of the main bars are butted at the connection part, but the stirrups are not arranged, and the arrangement interval of the stirrups at the connection part is the arrangement of other parts. It is the same as the interval. In addition, when crossing the assembly reinforcing bars arranged in two orthogonal directions, the free ends of the main bars are concentrated at the intersecting part, but the stirrups are not arranged, and the spacing between the staggered bars at the intersecting part is the other part. It becomes the same as the arrangement interval in. Therefore, there is no problem in strength at the connecting part or the crossing part of the assembled reinforcing bars.
[0017]
For this reason, even when the main bars at the connecting part or the crossing part of the assembled reinforcing bars are connected by the fixing bars or joint bars, these fixing bars and joint bars are arranged along the main bars, No more reinforcing bars are placed than necessary. For this reason, a plurality of reinforcing bars are not arranged close to each other at the connecting part or the crossing part of the assembled reinforcing bars, and when the concrete is placed, the placed concrete is surely filled.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the above-described basic reinforcement structure will be described. In the bar arrangement according to the present invention, when the main bars constituting the assembly reinforcing bars are arranged on the basic module of the building, the ribs connecting the main bars are arranged at a position displaced by 1/2 pitch from the basic module. In this way, the spliced bar is arranged at a position displaced from the basic module even though the main bar is arranged on the basic module, or the connecting part for connecting the assembled reinforcing bars in series, or Eliminating the concentration of stirrups at the intersections where the assembly reinforcing bars arranged in two orthogonal directions intersect, facilitating the bar arrangement work, and eliminating the filling failure of concrete due to the approach of multiple reinforcing bars It is what I did.
[0019]
In the present invention, the basic module of a building refers to a position that is set in a target building and to which a frame including columns and beams can be attached, and the interval between the basic modules is referred to as a module dimension. This basic module is generally different depending on a house maker or a contractor, and is not uniquely set for all houses including a wooden house and a steel frame house. In this embodiment to be described later, the module size is set to 305 mm.
[0020]
In the present invention, as the assembled reinforcing bars, a plurality of main reinforcing bars are arranged in a line on the same plane and connected by straight ribbed bars, unit reinforcing bars formed in a lattice plate shape, and the plurality of main reinforcing bars are substantially rectangular. A hook-shaped reinforcing bar formed into a saddle shape is set by connecting to the corners of the ribs formed in a loop shape, and either of these unit reinforcing bars or hook-shaped reinforcing bars can be used selectively .
[0021]
The number and thickness of the main reinforcing bars in the assembled reinforcing bars are not limited as long as the necessary reinforcing bar amount obtained from the result of the structural calculation can be satisfied. Further, it is preferable that the assembled reinforcing bars are manufactured in advance at the factory stage. As described above, by industrially producing the assembled reinforcing bar, it is possible to make the assembled reinforcing bar into parts, and it is possible to supply a rational and preferable assembled reinforcing bar corresponding to the module of the building.
[0022]
In the present invention, the meaning of placing the main reinforcing bar on the basic module of the building does not necessarily mean that the main reinforcing bar coincides with the basic module, but when the assembled reinforcing bar is placed at a predetermined position, This means that the main bars arranged in the horizontal direction (width direction) are evenly distributed in the width direction with reference to the basic module.
[0023]
That is, when the assembled reinforcing bars are lattice plate-like unit reinforcing bars, the plurality of main reinforcing bars constituting the unit reinforcing bars are arranged in a line on the same plane, and the main reinforcing bars are arranged in the vertical direction. For this reason, when arranging the unit reinforcing bars, arranging the main bars on the basic module means that the main bars coincide with the basic module.
[0024]
Further, when the assembly reinforcing bar is a saddle type reinforcing bar, a plurality of main bars are arranged in the vertical direction and the width direction, respectively. For this reason, when arranging saddle-type reinforcing bars, placing the main reinforcing bars on the basic module means that the positions of the plurality of main reinforcing bars arranged in the width direction of the saddle-type reinforcing bars are even with reference to the basic module. It will be distributed. In this case, the main bar does not coincide with the basic module, but even in such a case, the main bar is arranged on the basic module of the building.
[0025]
Therefore, if the rebar has an odd number of main bars in the width direction, the central main bar matches the basic module, but if the rebar has an even number of main bars in the width direction, the positions of these main bars are even from the basic module. There is no main line that is allocated and matches the basic module. In the present invention, in any case, the assembled reinforcing bars are arranged on the basic module of the building.
[0026]
Although the displacement dimension with respect to the basic module of the stirrup which comprises an assembly reinforcing bar is not specifically limited, It is preferable that this displacement dimension is 1/2 of a basic module. Since the displaced stirrup has a constant displacement dimension, it is arranged at the same interval as the basic module and at the center of the adjacent basic module.
[0027]
For this reason, after constructing a foundation beam having an assembled reinforcing bar, when a hole for piping or the like is additionally processed in the foundation beam, it is possible to easily confirm the position of the stirrup from the outside.
[0028]
Next, a preferred embodiment of the bar arrangement will be described with reference to the drawings. FIG. 1 is a diagram for explaining the structure of a connecting portion for connecting unit reinforcing bars in series and the structure of an intersecting portion that intersects in a T-shape. FIG. 2 is a diagram for explaining the structure of the intersection where the unit reinforcing bars intersect in a cross shape. FIG. 3 is a diagram for explaining the structure of the crossing portion where the saddle-shaped reinforcing bars cross in a T shape.
[0029]
First, the structure of the connection part which connects the some unit rebar A in series with FIG. 1 and the cross | intersection part which cross | intersects in T shape is demonstrated. In addition, the figure (a) is an elevation view, and the figure (b) is a top view.
[0030]
In the assembled reinforcing bar according to the present embodiment, a plurality of main reinforcing bars 1 are arranged in a line at a predetermined interval on the same plane, and connected to a plurality of linear ribs 2 by means of welding or the like. It is configured as a lattice plate unit rebar A. This unit rebar A is manufactured at the factory stage, and is configured as a standard part having a length corresponding to an integral multiple of a module set in a building.
[0031]
A basic module M and a pitch are set in advance in a building (not shown). In this embodiment, the pitch of the basic module M is set to 305 mm, and the dotted lines constituting the vertical and horizontal grids shown in FIGS. 1B and 2 indicate the basic module M, respectively. The pitch of adjacent basic modules M corresponds to 305 mm. However, not all the lines of the basic module M are described in the plan view of the house, and in fact, the positions corresponding to the housing and the positions corresponding to the integer multiples of the pitch of the basic module M are described. The
[0032]
In the unit reinforcing bar A, the interval between adjacent stirrups 2 to which the main reinforcing bar 1 is connected is equal to the pitch of the basic module, and each arrangement position is displaced by 1/2 pitch from the basic module M set in the building. is doing. For this reason, there is no right and left hand on the member and the arrangement of the reinforcing bars, and the stirrups 2 are not arranged at both end portions of the unit reinforcing bar A.
[0033]
Accordingly, as shown in the figure, when the unit reinforcing bars A are arranged so that the main reinforcing bars 1 are positioned on the basic module M and the both ends in the longitudinal direction thereof are arranged so as to coincide with the basic module M, each stirrup 2 Is arranged at a position displaced from the basic module M by a half pitch. That is, although the main reinforcement 1 of the unit reinforcing bar A is arranged in the basic module M, the loose reinforcement 2 is not arranged.
[0034]
For this reason, in the connection part B which connects the unit reinforcing bars A in series and the crossing part C where the unit reinforcing bars A intersect in series and orthogonal directions, the stirrup 2 on the end side in the unit reinforcing bars A in each direction is It is arranged at a position displaced by 1/2 module from the connection part B and the intersection part C, and the streaks 2 do not exist in these connection part B and intersection part C.
[0035]
Therefore, in the connection part B, it is possible to connect via the joint bar | burr 3 by connecting the linear joint bar | burr 3 along the main bar | burr 1 of each unit reinforcing bar A connected in series. In the connection part B configured in this way, the plurality of streaks 2 are not concentrated as in the prior art. For this reason, when concrete is laid, this concrete is filled around the main reinforcing bar 1 and the joint reinforcing bar 3 at each of the reinforcing bars 1 and 2 and the intersection B constituting the unit reinforcing bar A to form a preferable foundation beam. Is possible. Further, in the unit reinforcing bars A connected in series, the stirrup bars 2 are arranged at a pitch equal to the module size, and there is no problem in strength.
[0036]
In addition, at the intersection C where the plurality of unit reinforcing bars A intersect in a T shape, the ends of the main reinforcing bars 1 constituting the unit reinforcing bars A arranged in three directions around the intersection C are concentrated. The rib 2 is not present at the end.
[0037]
Therefore, the unit reinforcing bar A can be connected through the fixing bar 4 by connecting the fixing bar 4 formed in an L shape along the main reinforcing bar 1 of the unit reinforcing bar A arranged in the orthogonal direction. is there. In the intersection C configured in this way, the plurality of stirrups 2 do not concentrate. For this reason, when concrete is laid, this concrete is filled around the reinforcing bars 1 and fixing bars 4 at the reinforcing bars 1 and 2 and the crossing part C constituting the unit reinforcing bar A to form a preferable foundation beam. Is possible.
[0038]
Further, in the unit reinforcing bars A connected in each direction, the ribs 2 are arranged at a pitch equal to the module size, and there is no problem in strength.
[0039]
Further, when installing anchor bolts 5 for connecting the chassis to the connection part B or the intersection part C, the anchor bolts 5 match the streaks 2 unless the distance between the anchor bolts 5 matches the module dimensions. There is nothing to do. For this reason, even when a plurality of anchor bolts 5 are installed in the vertical direction and the concrete is cast, the cast concrete flows between the anchor bolt 5 and the stirrup 2 and is sufficiently filled. . Accordingly, there is no problem with strength.
[0040]
Next, the structure of the intersection D where a plurality of unit rebars A intersect in a cross shape will be described. In the figure, the same parts and parts having the same functions as those of the above-described embodiment are designated by the same reference numerals and the description thereof is omitted.
[0041]
The intersection D is set at the intersection of two basic modules M orthogonal to each other, and a plurality of unit reinforcing bars A are arranged in each direction. There is a case where one set of unit reinforcing bars A is arranged in each direction at the intersection D where the unit reinforcing bars A in two orthogonal directions intersect, and four sets of unit reinforcing bars A can be concentrated at the intersection D. However, in this embodiment, the unit rebar A arranged in one direction (vertical direction in FIG. 2) passes through the intersection D, and is orthogonal to the unit rebar A (in FIG. 2). Two sets of unit reinforcing bars A cross each other in the left-right direction).
[0042]
In the unit reinforcing bars A arranged in each basic module M, the main reinforcing bars 1 constituting these unit reinforcing bars A are arranged on the basic module M, and the ends of the main reinforcing bars 1 of the unit reinforcing bars A arranged opposite to each other intersect. Concentrate on part D. However, the crossover part D does not have the stirrup 2 that constitutes the three sets of unit reinforcing bars A arranged in each direction.
[0043]
Accordingly, in the connecting portion D, the linear reinforcing bar 3 is connected to the main reinforcing bar 1 of the unit reinforcing bar A arranged in the left and right direction and opposite to the unit reinforcing bar A arranged in the vertical direction in the figure. It is possible to connect through the joint bars 3 by tying them along. In the connecting portion D configured as described above, when concrete is placed, the concrete can be filled around the main reinforcing bar 1 and the joint reinforcing bar 3 constituting the unit reinforcing bar A to form a preferable foundation beam. . In the unit reinforcing bars A connected in a cross shape, the stirrups 2 are arranged at a pitch equal to the module size, and there is no problem in strength.
[0044]
Moreover, when installing the anchor bolt 5 for connecting a housing to the connection part D, this anchor bolt 5 does not correspond with the stirrup 2 except the case where the space | interval of these anchor bolts 5 corresponds with a module dimension. . Therefore, even when a plurality of anchor bolts 5 are installed in the vertical direction and the concrete is cast, the cast concrete flows between the anchor bolt 5 and the stirrup 2 and is sufficiently filled. There is no problem with strength.
[0045]
Next, the reinforcing bar 7 has a rib 7 formed in a substantially rectangular loop shape, and the main bar 6 is disposed at least at the corner of the barb 7, and the main bar 6 and the barb 7 are welded to each other in this state. A bar arrangement structure in the case of using a saddle type reinforcing bar E connected by means and having a saddle shape will be described with reference to FIG. In the present embodiment, the same portions and portions having the same functions as those of the above-described embodiments are denoted by the same reference numerals and description thereof is omitted.
[0046]
The saddle type reinforcing bar E is manufactured at the factory stage like the unit reinforcing bar A, and is configured as a standard part having a length corresponding to an integral multiple of a module set in a building.
[0047]
When the vertical reinforcing bar E is installed by placing the main reinforcing bar 6 on the basic module M, the two main reinforcing bars 6 arranged in the width direction constituting the vertical reinforcing bar E are separated from the basic module M by the distance between them. Evenly distributed based on the basic module M. In short, the saddle type reinforcing bar E is arranged with the center connecting the two main reinforcing bars 6 arranged in the width direction of the saddle type reinforcing bar E aligned with the basic module M.
[0048]
The rib 7 in the saddle type reinforcing bar E is the same as the rib 2 of the unit reinforcing bar A. The pitch of the adjacent rib 7 is the same as the pitch of the basic module M, and the installation position is 1 with respect to the basic module M. / 2 pitch displacement. Therefore, when the main reinforcing bar 6 of the saddle type reinforcing bar E is arranged on the basic module M, the main reinforcing bar of each vertical type reinforcing bar E is connected at the connecting part connecting the vertical type reinforcing bars E in series or at the intersecting part F intersecting at right angles. Although the ends of 6 are concentrated, the stirrup 7 does not exist.
[0049]
That is, as shown in FIG. 3, the saddle type reinforcing bar E arranged in the orthogonal direction (vertical direction in FIG. 3) with respect to the saddle type reinforcing bar E arranged in one direction (left and right direction in FIG. 3). Are crossed in a T-shape, at the intersection F, the ends of the main muscle 6 are concentrated, but the stirrup 7 does not exist. For this reason, it is possible to connect to each other by tying a fixing bar (not shown) formed in an L shape along the main bar 6 in two directions.
[0050]
In the connecting portion F configured as described above, when concrete is placed, the concrete is sufficiently filled and adhered around the main reinforcement 6 and the fixing reinforcement constituting the saddle type reinforcing bar E. For this reason, it is possible to constitute a preferable foundation beam. Further, in each saddle type reinforcing bar E, the ribs 7 are arranged at a pitch equal to the module size, and there is no problem in strength.
[0051]
Further, when the anchor bolts 5 for connecting the frame to the connecting portion F are installed, the anchor bolts 5 do not coincide with the streaks 7 unless the distance between the anchor bolts 5 coincides with the module dimensions. . For this reason, even when a plurality of anchor bolts 5 are installed in the vertical direction and the concrete is cast, the cast concrete flows between the anchor bolt 5 and the stirrup 7 and is sufficiently filled. There is no problem with strength.
[0052]
【The invention's effect】
As described above in detail, in the reinforcing bar structure of the foundation according to the present invention, since the stirrup of the rebar is set at a position displaced by a certain dimension with respect to the basic module, the main bar of the rebar is placed on the basic module of the building. When arranged, the stirrup is disposed at a position displaced by a certain dimension from the basic module, and both end portions of the main rebar in the assembled reinforcing bar are in a free end state without disposing the stirrup.
[0053]
For this reason, when connecting assembled rebars in series, or when connecting crossed rebars arranged in two orthogonal directions, the free ends of the main bars are concentrated at these connecting parts, Since the arrangement intervals of the stirrups at the intersections are not the same as the arrangement intervals at the other portions, there is no problem of strength at the connection portion or the intersection portion.
[0054]
Accordingly, it is possible to improve the fit in the connecting part and the crossing part of the assembled reinforcing bars and to secure the filling property of the concrete, so that a solid and highly durable foundation can be obtained.
[0055]
In addition, since the stirrups that make up the rebars are displaced with a fixed pitch relative to the basic module, after placing these rebars, the standard for footing and foundation slabs Can be used as Further, even if the foundation is completed, the position of the streaks can be easily confirmed from the outside, which is advantageous when additional processing such as drilling is performed.
[0056]
In particular, when the assembled reinforcing bar is a lattice plate-shaped unit reinforcing bar, if the main reinforcing bar of this unit reinforcing bar is placed on the basic module and installed, the main reinforcing bar is always placed at the center. It is possible to eliminate the fit when unit rebars are crossed.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a structure of a connecting portion that connects unit reinforcing bars in series and a structure of an intersecting portion that intersects in a T-shape.
FIG. 2 is a diagram for explaining a structure of an intersecting portion where unit reinforcing bars intersect in a cross shape.
FIG. 3 is a diagram for explaining a structure of an intersecting portion that intersects saddle-shaped reinforcing bars in a T shape.
FIG. 4 is a diagram showing an example in which conventional unit reinforcing bars are arranged in series on a basic module and connected.
FIG. 5 is a diagram showing an example in which conventional unit reinforcing bars are arranged on a basic module and connected in a T shape.
FIG. 6 is a diagram showing an example in which conventional saddle-shaped reinforcing bars are arranged on a basic module and connected in a T shape.
[Explanation of symbols]
A unit reinforcing bar B connecting part C, D, F crossing E saddle type reinforcing bar M basic module 1,6 main bar 2,7 stirrup 3 joint bar 4 anchoring bar 5 anchor bolt

Claims (2)

In the foundation where the main reinforcement is placed on the basic module of the building,
A bar arrangement structure of a foundation characterized in that the installation position of each stirrup in the assembled reinforcing bar or vertical reinforcing bar is set at a position displaced by 1/2 pitch with respect to the basic module of the building. The reinforcing bar structure of the foundation according to claim 1, wherein the main reinforcing bar is set to an integral multiple of the basic module of the building.

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