JP2013185425A - Bar arrangement structure and bar arrangement construction method of steel structure building/concrete foundation beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bar arrangement structure and a bar arrangement construction method capable of supplying and constructing reinforcing bars in a short period of time, stabilizing quality, minimizing inspections and reducing costs, while using highly reliable mechanical reinforcing bar joints, in a concrete foundation beam for which a superstructure is a steel structure.SOLUTION: Continuous reinforcing bars 10 which are longitudinal bars continuously provided over the entire length of a concrete foundation beam 6 comprise a pair of end reinforcing bars 11 positioned at both ends, a plurality of intermediate standard length reinforcing bars 12 of the length equal to each other, that are respectively arranged side by side between them, and one length adjusting reinforcing bar 13. The pair of end reinforcing bars 11 have a diameter-enlarged head 11 for fixation at the end to be the end of the continuous reinforcing bars 10. The end reinforcing bars 11, the intermediate standard length reinforcing bars 12 and the length adjusting reinforcing bar 13 are connected to each other by screw type mechanical reinforcing bar joints 14. For the end reinforcing bars 11 and the intermediate standard length reinforcing bars 12, the ones prepared by a steel product manufacturer or the like as standard length objects are used.

Description

  The present invention relates to a bar arrangement structure and a bar arrangement method for a concrete foundation beam in a building in which the upper structure is a steel structure and the foundation is a concrete structure.

  Reinforcing bar joints are graded into SA class, A class, B class, C class, etc. according to the building rules depending on the type, reliability, etc., and the joint position is restricted by the class. Reinforced joints used for RC (steel reinforced concrete) frames are not restricted when the grade is SA class, and there are some restrictions due to building rules when grade A is used. Even in that case, because of the build-to-order production for each building property by the frame form and construction method, the productivity cannot be increased. Regarding the improvement of productivity, there are some proposals for standardizing only the outer end portion having the fixing enlarged head portion.

  In RC buildings, various proposals have been made regarding rebar scaling and threaded rebar joints (for example, Patent Documents 1 to 5).

JP2011-84897A JP 2011-84898 A JP 2009-1114810 A JP 2009-161986 JP 2009-260456 A

Each of the above proposal examples is a proposal for an RC building, and is a device that takes into account the restrictions in the strength and building rules of the RC building.
However, in concrete foundation beams in buildings where the upper structure is steel structure (S structure), it is easy to ensure the required strength and reliability. There are no restrictions. Most buildings with medium to low floor areas with large to small scales are usually made up of rebars with a medium diameter or less, with lap joints for small diameters and gas pressure welding for medium diameters. In fact, joints and welded joints are mainly used.

  In the case of steel frame construction, if the period from the start of construction to the reinforcement work is short and only the material (reinforcement) can be dealt with, subsequent measures were taken on site. However, lap joints, gas pressure welding, and welding work depend on errors, quality inspections, weather, and skill of technicians, and are not optimal. Although it is preferable to use a mechanical rebar joint such as a screw type, in a threaded mechanical rebar joint, it is necessary to process a male thread portion at the end of the rebar. Therefore, in the case of a steel structure building with a short period from start to rebar construction, it is difficult to keep various lengths of rebars according to customer requirements in time for delivery.

  The object of the present invention is to provide rebar in a short period of time while using a highly reliable mechanical rebar joint in a concrete foundation beam whose upper structure is a steel frame, stable quality and minimization of inspection. It is intended to provide a bar arrangement structure and a bar arrangement method for a steel structure / concrete foundation beam that can reduce costs.

The reinforcement structure of a steel structure building / concrete foundation beam according to the present invention is a reinforcement structure of a concrete foundation beam in a building whose upper structure is a steel structure,
The continuous reinforcing bars, which are a plurality of main reinforcing bars provided continuously over the entire length of the concrete foundation beam, are arranged side by side between the pair of end reinforcing bars located at both ends of the continuous reinforcing bars and the pair of end reinforcing bars, respectively. It is composed of a plurality of intermediate fixed bars having the same length and one length adjusting reinforcing bar.
The pair of end rebars has a fixing head at an end on the side that becomes the end of the continuous rebar, and the end rebar, the intermediate fixed rebar, and the adjacent rebar in the length adjusting rebar The connection between each other is performed by mechanical rebar joints.
Mechanical rebar joints, also called mechanical joints, refer to rebar joints other than lap joints, gas pressure welded joints, and welded joints, and are deformed by mechanical stress transmission such as threaded rebar joints, sleeve joints, and collar crimps. It is a steel bar joint.

According to this configuration, since the upper structural body is a concrete foundation beam in a building having a steel structure and uses mechanical rebar joints, there is no restriction on the joint position in terms of structure or building rules. The mechanical rebar joint is classified into class A or class SA, and the position of the joint is not restricted by the building rules in a concrete foundation beam in a building whose superstructure is a steel structure.
Therefore, it is possible to continuously connect any length by three or four types of rebars, two end rebars at both ends and an appropriate number of medium-sized rebars, only by interposing one length adjusting rebar. Reinforcing bars can be constructed and concrete foundation beams with different lengths can be dealt with for each property and each part of the property. When the lengths of the two end rebars at both ends are the same, there are three types, and when the lengths are different from each other, there are four types. One length adjusting rebar is necessary as a rebar that needs to change the length according to the beam length. However, since there is only one length adjusting rebar for each continuous rebar, As a whole of the necessary reinforcing bars, it does not take a long time from order receipt to delivery. End rebar and intermediate rebar need only be a standard object, and only one type of intermediate rebar and one or two end rebars are needed. Neither will there be a problem on the inventory storage location for the classification storage.
For these reasons, it is possible to supply rebars in a short period of time while using reliable mechanical rebar joints in concrete foundation beams whose superstructure is a steel structure, ensuring stable quality, minimizing inspection, and cost. Reduction can be achieved.

The fixing head may be a fixing enlarged diameter head provided in an enlarged shape at an end of the end reinforcing bar. The fixing enlarged diameter head may be in the form of a flange or a cylinder.
The fixing head may be a bending portion of a reinforcing bar, but when a fixing enlarged diameter head is provided, the bar arrangement structure is larger than that fixed by a fixing head consisting of a bending portion of the reinforcing bar. Simplified and highly reliable. On the other hand, end rebars with an enlarged diameter head for fixing are disadvantageous in that it takes time and effort to manufacture, but if only one or two types are prepared, a large number of them are manufactured and stocked without waste. I can leave.

In this invention, each of the mechanical rebar joints is a threaded rebar joint, and the pair of end rebars are provided with male thread portions constituting the threaded rebar joint at the end opposite to the fixing head. And each of the intermediate fixed bars and the length adjusting reinforcing bars may have male screw portions constituting the threaded reinforcing bar joint at both ends.
There are various types of mechanical rebar joints as described above, but since the sleeve joint injects the grout inside the sleeve, it takes time to cure. Compared to this, the threaded reinforcing bar joint does not require curing, can be constructed in a short time, and has high reliability. The threaded reinforcing bar joint has such advantages, but has a disadvantage that it takes time to process the reinforcing bar because it is necessary to process the male threaded portion at the end of the reinforcing bar. However, in the present invention, the end rebar and the intermediate rebar that are connected by the screw-type rebar joint need only be prepared in a standard size, and it is mass-produced before ordering by a steel manufacturer or the like without causing waste. Thus, the efficiency of screw machining can be improved.

In the present invention, each of the pair of end reinforcing bars, intermediate fixed length reinforcing bars, and length adjusting reinforcing bars is a screw reinforcing bar in which a spiral protrusion is provided over the entire length, and each of the mechanical types The reinforcing bar joint may be a threaded reinforcing bar joint in which the spiral protrusion of the threaded reinforcing bar becomes a thread of a male screw.
The screw rebar is a kind of deformed rebar, and is a rebar in which the outer ridge is spiral. When such a threaded rebar is used, a threaded rebar joint in which the spiral protrusion of the threaded rebar becomes the thread of a male thread is used to machine a male thread part dedicated for connection at the end of the rebar. This eliminates the need to improve productivity.

  In this invention, two types of continuous reinforcing bars which are a plurality of the main reinforcing bars provided on the concrete foundation beam are provided, and these two types of continuous reinforcing bars use two types of end reinforcing bars, respectively. The end reinforcing bar arrangement is reversed, but the end reinforcing bars used are the same, but the end reinforcing bars are the same except that the end reinforcing bar arrangement is reversed. The order of arrangement of the intermediate fixed reinforcing bars and the length adjusting reinforcing bars may be the same.

  In this configuration, the length of the end rebar on one end side is different between the two types of continuous rebar, and the position of each mechanical rebar joint is shifted from each other by the difference in length. become. Mechanical rebar joints are designed to be stronger than the general part of a rebar, and are so prescribed in the building rules. However, if the mechanical rebar joint is weaker than the general part of the rebar, an excessive load acts on the concrete foundation beam due to a large earthquake, etc., and the rebar breaks at the position of the mechanical rebar joint However, since the positions of the mechanical reinforcing bar joints of the plurality of main reinforcing bars of the concrete foundation beam are shifted, the reinforcing bars do not break at the same length position, and the strength reduction of the concrete foundation beam can be mitigated. Although there are two types of end reinforcing bars, it is sufficient to prepare four types of reinforcing bars as a whole of the continuous reinforcing bars, so that the effect of supplying the reinforcing bars in a short period with a small number of types of reinforcing bars is sufficiently obtained.

The steel bar building / concrete foundation beam reinforcement construction method according to the present invention is a concrete foundation beam reinforcement construction method in a building whose upper structure is steel, and has a fixing head at one end. And a medium-sized rebar having the same length and a length-adjusting rebar that is used by adjusting the length arbitrarily,
Continuous reinforcing bars that are main bars provided continuously over the entire length of the concrete foundation beam are arranged side by side between the pair of end reinforcing bars located at both ends of the continuous reinforcing bars and the pair of end reinforcing bars. A plurality of intermediate rebars and one length adjusting rebar,
The connection between the end reinforcing bar, the intermediate fixed reinforcing bar, and the adjacent reinforcing bar in the length adjusting reinforcing bar is performed by a mechanical reinforcing bar joint.
The fixing head may be a fixing enlarged diameter head provided in an enlarged shape at the end of the end reinforcing bar, or may be a bent part of the reinforcing bar.

  According to this construction method, similarly to the description of the reinforcing structure of the steel building / concrete foundation beam of the present invention, in the concrete foundation beam whose upper structure is a steel structure, a mechanical rebar joint with excellent reliability is provided. Reinforcing bars can be supplied in a short period of time, and quality can be stabilized, inspection can be minimized, and costs can be reduced.

In the method of the present invention, each of the mechanical rebar joints is a screw rebar joint, and the pair of end rebars are male screw portions constituting the screw rebar joint at the end opposite to the fixing head. Each of the intermediate fixed reinforcing bars and the length adjusting reinforcing bars may have male threaded portions constituting the threaded reinforcing bar joints at both ends.
In this case, as described with respect to the bar arrangement structure of the present invention, the threaded reinforcing bar joint can be effectively employed, and the construction period can be further shortened.

  The reinforcing structure of a steel building / concrete foundation beam according to the present invention is a reinforcing structure of a concrete foundation beam in a building whose upper structure is a steel structure, and is continuous over the entire length of the concrete foundation beam. The continuous reinforcing bars, which are the main reinforcing bars, are arranged in parallel between a pair of end reinforcing bars located at both ends of the continuous reinforcing bars and a pair of end reinforcing bars. The rebar is composed of a rebar and one length-adjusting rebar, and the pair of end rebars has a fixing head at the end that is the end of the continuous rebar, and the end rebars, A mechanical rebar with high reliability in a concrete foundation beam whose upper structure is a steel structure because the intermediate rebar and the adjacent rebar in the length-adjusting rebar are connected by a mechanical rebar joint. Using rebar joints, iron can be used in a short period of time. And it can supply stable quality, minimizing the inspection cost can be reduced.

  The steel bar building / concrete foundation beam reinforcement construction method of the present invention is a concrete foundation beam reinforcement construction method in a building whose upper structure is steel, and has a fixing head at one end. And an intermediate fixed reinforcing bar having the same length and a length-adjusting reinforcing bar that is arbitrarily adjusted in length, and a continuous reinforcing bar that is a main reinforcing bar that is continuously provided over the entire length of the concrete foundation beam. A pair of the end reinforcing bars located at both ends of the continuous reinforcing bar, a plurality of the intermediate regular reinforcing bars arranged in parallel between the pair of end reinforcing bars, and the one length adjusting reinforcing bar A concrete foundation in which the upper structure is a steel structure because the end rebar, the intermediate-size rebar, and the length-adjusting rebar are connected to adjacent rebars by mechanical rebar joints. Excellent reliability in beams While using a mechanical reinforcing bar joint, able supplying rebar quickly, stability of quality, minimizing the inspection cost can be reduced.

It is a partially broken front view of the schematic structure of the building using the reinforcement structure of the steel structure building and concrete foundation beam concerning one embodiment of this invention. It is a concealed figure of the concrete foundation beam of the steel structure building part. It is sectional drawing of the concrete foundation beam. It is explanatory drawing of the various reinforcing bars used for the concrete foundation beam. It is sectional drawing of the mechanical rebar joint. It is a front view of the external thread part of the mechanical rebar joint. (A), (B) is the front view and fracture | rupture front view of each example of the diameter expansion head for fixation of the same-end part reinforcement, respectively. It is a partially broken front view of the schematic structure of the building using the reinforcement structure of the steel structure building and concrete foundation beam which concerns on other embodiment of this invention. It is explanatory drawing of the various reinforcing bars used for the concrete foundation beam. It is a partially broken front view of the schematic structure of the building using the reinforcement structure of the steel structure building and concrete foundation beam which concerns on other embodiment of this invention. It is explanatory drawing of the various reinforcing bars used for the concrete foundation beam. It is sectional drawing of the modification of a mechanical rebar joint. It is explanatory drawing of the various rebars in the case of using the mechanical rebar joint of the modification.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a part of a building to which a reinforcement structure of a steel structure building / concrete foundation beam and a reinforcement construction method according to this embodiment are applied. This building is a medium to low-rise building that becomes an office building, a commercial facility, or a housing complex, for example. The upper structure 1 of this building is a steel structure composed of steel columns 2 and steel beams 3, and the foundation 4 is a reinforced concrete structure.

  The foundation 4 includes a column base 5 that is a locally rising foundation portion, and a concrete foundation beam 6 that is provided across the plurality of column bases 5. Although the concrete foundation beam 6 is illustrated as being provided between a pair of adjacent column bases 5 and 5 in FIG. 1, in the case of a building having a large floor area, generally, as shown in FIG. In addition, another column base 5 is interposed between one concrete foundation beam 6. The concrete foundation beam 6 to which the bar arrangement structure and the bar arrangement construction method according to this embodiment are applied is provided between the column bases 5 at both ends, and no other column base 5 is interposed in the middle. Alternatively, the column base 5 may be present at both ends and in the middle.

  One concrete foundation beam 6 is a beam continuously provided at the same height position. As shown in FIG. 1, beams having different heights are different concrete foundation beams 6. The concrete foundation beam 6A shown with hatching in FIG. 2 is different from the concrete foundation beam 6 without hatching in height as shown in FIG.

  For example, as shown in a cross section in FIG. 3, the reinforcement of each concrete foundation beam 6 includes a plurality of upper bars 7 and a plurality of lower bars 8, which are main bars, and a rib 9. The upper bar 7 and the lower bar 8 are provided over the entire length of one concrete foundation beam 6, and the upper bar 7 and the lower bar 8 become continuous reinforcing bars 10.

  As shown in FIG. 1, the continuous reinforcing bar 10 includes a pair of end reinforcing bars 11 located at both ends, and a plurality of intermediate bars that are arranged side by side between the pair of end reinforcing bars 11. It is composed of a fixed length reinforcing bar 12 and one length adjusting reinforcing bar 13. The pair of end reinforcing bars 11 have a fixing enlarged diameter head 11 b that is a fixing head at the end on the side that becomes the end of the continuous reinforcing bar 10. Each reinforcing bar 11, 12, 13 is a deformed reinforcing bar having the same diameter. These end rebars 11, intermediate fixed rebars 12, and length adjusting rebars 13 are connected to adjacent rebars by mechanical rebar joints 14.

  The end rebar 11 and the medium-sized rebar 12 are both manufactured and stored in one or more types of rebar for each rebar diameter in order to be used for any building in a steel manufacturer or the like. It is used by selecting from the stored. The length of the fixed length is preferably about 1.8 m to 5.3 m for both the end reinforcing bar 11 and the intermediate fixed reinforcing bar 12, for example. The end rebar 11 and the intermediate standard rebar 12 may be prepared in a plurality of types having different lengths in a steel manufacturer or the like, but one concrete foundation beam 6 has the same length. It is preferable to use the partial reinforcing bar 11 and the intermediate fixed reinforcing bar 12 for simplification of preparation. The length adjusting rebar 13 is manufactured for each building, for example.

  As described above, the mechanical rebar joint 14 is a reinforced joint other than a lap joint, a gas pressure welded joint, or a welded joint, and may be any of a screw-type rebar joint, a sleeve joint, a collar pressure bonding, and the like. In the form, it is a threaded rebar joint.

  FIG. 5 shows an example of a mechanical rebar joint 14 that is a threaded rebar joint. The threaded mechanical reinforcing bar joint 14 is a male threaded portion 11a provided at the end of a pair of reinforcing bars (one of the end reinforcing bar 11, the intermediate fixed reinforcing bar 12, and the length adjusting reinforcing bar 13) connected to each other. , 12a, 13a, and a steel screw cylinder 15 whose inner peripheral surface is a female screw portion 15a and is screwed over both male screw portions 11a, 12a, 13a. Each of the reinforcing bars (11, 12, 13) is a deformed reinforcing bar, and has a rib 16a extending along the axial direction on the outer peripheral surface and a protrusion 16 such as a node 16b extending in the circumferential direction over a half circumference or the entire circumference. have. As shown in FIG. 6, each of the male screw portions 11 a, 12 a, and 13 a has a screw bottom diameter d <b> 2 that is larger than the outer diameter d <b> 1 of the protrusion 16, thereby ensuring the strength of the mechanical rebar joint 14. At the same time, the screw cylinder 15 can be screwed deeper into the center side where the protrusion 16 exists than the male screw portions 11a, 12a and 13a, and the connection work can be performed by unscrewing the screw cylinder 15. We are trying to improve. Each of the male screw portions 11a, 12a, and 13a may be formed by rolling or the like on a reinforcing bar, or a male screw member (not shown) threaded on the outer peripheral surface of a round steel may be pressed against the end of the reinforcing bar. It may be joined with.

  In FIG. 7, an enlarged diameter head portion 11b for fixing the end reinforcing bar 11 is called a T head or the like, and is used for a mechanical reinforcing bar fixing structure. For example, as shown in FIG. A diameter of the reinforcing bar 11 is integrally increased. For example, as shown in FIG. 5B, the fixing enlarged diameter head portion 11b has a male screw portion 11a formed at the end portion of the end reinforcing bar 11, and a head forming member 17 is screwed into the male screw portion 11a. It may be combined. The male screw portion 11a may be provided exclusively for screwing the head forming member 16, but may have the same specifications as the male screw portion 11a constituting the screw-type mechanical rebar joint 14. In this case, the end rebar 11 can be formed by screwing the head forming member 16 into the rebar prepared as the intermediate fixed rebar 12a.

  The construction method, operation, and effect of the reinforcing structure of the steel structure / concrete foundation beam with this configuration will be described. As shown in FIG. 4, three types of reinforcing bars are used: an end reinforcing bar 11, an intermediate fixed reinforcing bar 12, and a length-adjusting reinforcing bar 13, and a mechanical reinforcing bar joint 14 is used as a joint. A screw cylinder 15 (FIG. 5) is prepared. The end reinforcing bar 11 has a fixing enlarged diameter head portion 11b at one end and a male screw portion 11a at the other end. The intermediate fixed reinforcing bar 12 and the length adjusting reinforcing bar 13 have male screw portions 12a and 13a at both ends, respectively.

The end rebar 11 and the intermediate rebars 12 are both fixed lengths, that is, standardized lengths, and the necessary number is selected from those prepared by steel manufacturers for any purpose. Prepare with. For one continuous reinforcing bar 10, the end reinforcing bars 11 are two, the intermediate fixed reinforcing bar 12 is the number (n) according to the length of the continuous reinforcing bars 10, that is, n is the following formula (1),
[(Continuous rebar length) − (end rebar length) × 2] / (intermediate fixed length of rebar) (1)
This is the quotient (integer value) obtained by. The length-adjusting reinforcing bar 13 is one, and prepares the length which becomes the remainder of said Formula (1). The length adjusting rebar 13 is manufactured and prepared for each building.
The three types of rebars 11, 12, and 13 prepared in this way are connected by a mechanical rebar joint 14 as shown in FIG.

According to the bar arrangement structure and the bar arrangement construction method, the upper structural body 1 is a concrete foundation beam 6 in a building having a steel structure, and the mechanical reinforcing bar joint 14 is used. There are no restrictions. The mechanical rebar joint 14 is classified into class A or class SA, and the position of the joint is not limited by the building rules in the concrete foundation beam 6 in the building in which the upper structure 1 is a steel structure.
For this reason, by simply interposing one length-adjusting rebar 13, a continuous length of any length can be achieved by three types of rebars: two end rebars 11 at both ends and an appropriate number of intermediate fixed rebars 12. Reinforcing bar 10 can be constituted and it can cope with concrete foundation beam 6 from which length differs for every property and every part of the property. One length adjusting rebar 13 is necessary as a reinforcing bar having a length corresponding to the length of the concrete foundation beam 6, but only one length adjusting rebar 13 per continuous reinforcing bar 10, It does not take a long time from order receipt to delivery. The end rebar 11 and the intermediate rebar 12 need only be of a fixed size, and only one type of each is required. The above problem does not occur. Since the end reinforcing bar 11 has the fixing enlarged diameter head portion 11b, the bar arrangement structure is simplified and the fixing reliability is high as compared with the fixing by the bending portion of the reinforcing bar. On the other hand, there is a disadvantage that it takes time and labor to manufacture the end rebars 11, but if only one kind is prepared, a large number can be manufactured and stocked without waste.
Therefore, in the concrete foundation beam 6 in which the upper structure 1 is a steel frame, it is possible to supply the rebar in a short period of time while using the mechanical rebar joint 14 having excellent reliability, and stable quality and minimum inspection. And cost reduction. In addition, when the thing which screwed the head formation member 17 as FIG.7 (B) is used as the end part reinforcement 11, the same thing is used for the end part reinforcement 11 and the intermediate fixed scale reinforcement 12, and on the spot. Therefore, the number of types of reinforcing bars to be prepared can be further reduced.

  There are various mechanical rebar joints 14 as described above. However, since the sleeve joint injects the grout inside the sleeve, it takes time for curing. Compared to this, the threaded reinforcing bar joint used in this embodiment does not require curing, can be constructed in a short time, and has high reliability. The threaded reinforcing bar joint has such an advantage, but it has a drawback that it takes time to process the reinforcing bars because it is necessary to process the male threaded portions 11a, 12a and 13a at the ends of the reinforcing bars. However, in this embodiment, the end rebar 11 and the intermediate fixed rebar 12 to be connected by the threaded reinforcing bar joint need only be prepared in a standard size, and are not mass-produced before receiving an order without causing waste. Thus, the efficiency of screw machining can be improved.

  8 and 9 show another embodiment of the present invention. In this embodiment, in the first embodiment shown in FIG. 1 to FIG. 7, each of the main reinforcement bars is the upper reinforcement 7 or the lower reinforcement 8 provided on the concrete foundation beam 6 as shown in the sectional view of FIG. 3. Two types of reinforcing bars 10 are provided. Each of these two types of continuous reinforcing bars 10 (10A, 10B) uses two types of end reinforcing bars 11A, 11B, and the arrangement of the long and short end reinforcing bars 11A, 11B is reversed. The end reinforcing bars 11A and 11B, the intermediate rebars 12 and the length adjusting reinforcing bars 13 are the same, and the end reinforcing bars 11A and 11B, The arrangement order of the intermediate fixed reinforcing bars 12 and the length adjusting reinforcing bars 13 is also the same. Specifically, in the case of the bar arrangement example as shown in FIG. 3, the lower bar 8 and the upper bar 7 located on one side of the beam are different from each other, and between the lower bars 8, 8 at the left and right ends of the cross section, The upper end muscles 7 and 7 are different. The upper end stripe 7 at the center of the three upper end stripes 7 may be of any kind. The degree of the difference in length between the end reinforcing bars 11A and 11B is, for example, about 300 to 1000 mm. Thereby, although it is not required for the concrete foundation beam 6, it also conforms to the regulations for the arrangement of the reinforced joints required for the reinforced joints used for the RC (reinforced concrete) frame in the building rules.

In the case of this configuration, since the lengths of the end reinforcing bars 11A and 11B on one end side are different between the two types of continuous reinforcing bars 10 (10A and 10B), each mechanical type is corresponding to the difference in length. The positions of the reinforcing bar joints 14 are shifted from each other. The mechanical rebar joint 14 is designed to be stronger than the general part of the continuous rebar 10 and is also so prescribed in the building rules. However, when the mechanical rebar joint 14 is weaker than the general part of the continuous rebar 10 and an excessive load acts on the concrete foundation beam 6 due to a large earthquake or the like, the continuous rebar 10 breaks. Even if it breaks at the position of the joint 14, the positions of the mechanical reinforcing bar joints 14 of the plurality of main bars of the concrete foundation beam 6 are shifted from each other, so that the continuous reinforcing bar 10 does not break at the same length position, and the concrete foundation The strength reduction of the beam 6 can be mitigated. There are two types of end rebars, the end rebars 11A and 11B. However, since four types of rebars should be prepared as a whole of the continuous rebar 10, the effect that the number of rebar types is small and rebars can be supplied in a short period of time. Fully obtained.
Other configurations and effects in this embodiment are the same as those in the first embodiment described with reference to FIGS.

  10 and 11 show still another embodiment of the present invention. In this embodiment, in the first embodiment shown in FIGS. 1 to 7, the fixing head 11c provided on the end reinforcing bar 11 is constituted by a bent part of the reinforcing bar. As shown in FIG. 11, the end rebar 11 is prepared in a factory or the like having a fixing head portion 11c formed of a bent portion.

  In the case of this configuration, an effect such as simplification of the bar arrangement structure by using the fixing diameter-expanding head portion 11b in the first embodiment cannot be obtained, but the fixing head portion 11c including a bent portion is used. Since the processing is simpler than the fixing enlarged diameter head portion 11b, the cost of the end reinforcing bar 11 is reduced.

In the embodiment using the end rebar 11 having the fixing head portion 11c formed of the bent portion, similarly to the examples of FIGS. 8 and 9, two types of end rebar 11 having different lengths are provided, and the mechanical rebar is provided. The position of the joint 14 may be shifted.
Other configurations and effects in this embodiment are the same as those in the first embodiment described with reference to FIGS.

  12 and 13 show mechanical reinforcing bar joints and modifications of each reinforcing bar. In this example, in the first embodiment described with reference to FIGS. 1 to 7, a pair of end reinforcing bars 11, each of the intermediate fixed reinforcing bars 12, and the length adjusting reinforcing bars 13 are spirally projected on the outer periphery. The thread 16c is a screw rebar provided over the entire length. This screw rebar is a kind of deformed rebar. Each mechanical rebar joint 14 is a threaded rebar joint in which a spiral protrusion 16c of a threaded rebar is a thread of a male thread, and a screw cylinder 15 having a female screw 15a screwed into the protrusion 16c, It is comprised with the external thread which consists of the protrusion 16c.

  In the case of this configuration, each intermediate fixed bar 12 to be prepared is simply a long screw rebar cut into a fixed length, and the length adjusting rebar 13 is also cut into a required length with a long screw rebar. Just do things. The end rebar 11 may be formed by cutting a long screw rebar into a predetermined length and processing the fixing enlarged diameter head 11b. Therefore, it is not necessary to process a male thread portion dedicated for connection at the end of each of the reinforcing bars 11, 12, 13 and productivity is improved.

Also in this embodiment, as in the example of FIGS. 8 and 9, two types of end rebars 11 having different lengths may be provided, and the position of the mechanical rebar joint 14 may be shifted. As in the example, the end rebar 11 may have a fixing head 11c formed of a bent portion.
Other configurations and effects in this embodiment are the same as those in the first embodiment described with reference to FIGS.

DESCRIPTION OF SYMBOLS 1 ... Upper structure 2 ... Steel column 3 ... Steel beam 4 ... Foundation 5 ... Column base 6 ... Concrete foundation beam 7 ... Top bar 8 ... Bottom bar 9 ... Stirrups 10, 10A, 10B ... Continuous reinforcing bars 11, 11A, 11B ... End rebar 12 ... Medium-sized rebar 13 ... Length adjusting rebar 11a, 12a, 13a ... Male screw part 11b ... Fixing head 11c ... Fixing head 14 ... Mechanical rebar joint 15 ... Screw cylinder

Claims (8)

Reinforcement structure of concrete foundation beams in a building whose upper structure is steel frame,
The continuous reinforcing bars, which are a plurality of main reinforcing bars provided continuously over the entire length of the concrete foundation beam, are arranged side by side between the pair of end reinforcing bars located at both ends of the continuous reinforcing bars and the pair of end reinforcing bars, respectively. It is composed of a plurality of intermediate fixed reinforcing bars having the same length and one length adjusting reinforcing bar,
The pair of end rebars has a fixing head at an end on the side that becomes the end of the continuous rebar, and the end rebar, the intermediate fixed rebar, and the adjacent rebar in the length adjusting rebar Connection between each other was made with mechanical rebar joints.
Reinforcement structure of steel structures and concrete foundation beams.   The reinforcing structure of a steel building / concrete foundation beam according to claim 1, wherein the fixing head is a fixing enlarged diameter head provided in an enlarged shape at an end of the end reinforcing bar.   3. The mechanical reinforcing bar joint according to claim 1, wherein each of the mechanical reinforcing bar joints is a threaded reinforcing bar joint, and the pair of end reinforcing bars are connected to the threaded reinforcing bar joint at an end opposite to the fixing head. Reinforcement structure of a steel building / concrete foundation beam having a male thread portion that constitutes, and each of the intermediate fixed reinforcing bars and the length-adjusting reinforcing bars each having a male screw portion that constitutes the screw-type reinforcing bar joint at both ends.   In Claim 1 or Claim 2, each of the pair of end rebars, intermediate fixed bars, and length-adjusting rebars is a screw rebar in which a spiral protrusion is provided over the entire length on the outer periphery. The bar arrangement of a steel structure / concrete foundation beam, wherein each mechanical rebar joint is a threaded rebar joint in which the spiral protrusion of the screw rebar is a thread of a male thread.   In any one of Claims 1 thru | or 4, 2 types of continuous reinforcing bars which are the said each main reinforcement provided in the said concrete foundation beam are provided, and these 2 types of continuous reinforcing bars are 2 types of length, respectively. Use end rebars to reverse the arrangement of the long and short end rebars, but use each end rebar, each medium-sized rebar, and the length adjustment rebar the same, the end rebar length The arrangement of the steel bars and concrete foundation beams is the same in the arrangement order of the end reinforcing bars, each of the medium-sized reinforcing bars, and the length-adjusting reinforcing bars. Reinforcement method for concrete foundation beams in buildings where the superstructure is a steel structure, with a reinforcing bar having a fixing head at one end, an intermediate length reinforcing bar of equal length, and an arbitrary length Prepare a length-adjusting rebar to be used for adjustment,
A continuous reinforcing bar, which is a plurality of main reinforcing bars provided continuously over the entire length of the concrete foundation beam, is arranged between the pair of end reinforcing bars located at both ends of the continuous reinforcing bar and the pair of end reinforcing bars, respectively. It is composed of a plurality of the intermediate fixed reinforcing bars and one of the length adjusting reinforcing bars,
A connection between the end reinforcing bar, the intermediate scale reinforcing bar, and the adjacent reinforcing bar in the length adjusting reinforcing bar is performed by a mechanical reinforcing bar joint.
Reinforcement construction method for steel structures and concrete foundation beams.   7. The reinforcing bar enforcement method for a steel building / concrete foundation beam according to claim 6, wherein the fixing head is a fixing enlarged diameter head provided in an enlarged shape at an end of the end reinforcing bar. In Claim 6 or Claim 7, each said mechanical rebar joint is a screw-type rebar joint, and the above-mentioned pair of end rebars has the above-mentioned screw-type rebar joint in the end opposite to the above-mentioned fixing head. Reinforcement of steel building / concrete foundation beams having male threaded portions, each intermediate fixed bar and length-adjusting reinforcing bar having male threaded portions constituting the threaded reinforcing bar joints at both ends, respectively Enforcement method.

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