JP2007278037A - Method for preventing deformation of wire-cylinder, fixing metal fitting used in method, wire-cylinder and method for installing wire-cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cage-deformation prevention method capable of reducing costs for preventing a deformation such as loosing a shape of a wire-cylinder or the like generated during the process of assembling, transporting or erecting the cage while work efficiency for assembling the cage can be largely improved and also cages with a narrow space between them can be arranged double. <P>SOLUTION: The method prevents a deformation of a cage which is composed of a plurality of bar-shaped reinforcements 11 arranged around a central axis in almost parallel to the central axial direction and a plurality of hoops 12 disposed for crossing the plurality of the bar-shaped reinforcements 11 in the circumferential direction which is almost perpendicular to the central axis. Four of L-shaped steel materials 14 are inserted into the cage 10 in a parallel cross shape at predetermined intervals for the central axial direction. Furthermore, the inserted L-shaped steel material 14 is crossed with two bar-shaped reinforcements of the plurality of the bar-shaped reinforcements and then the crossing part of the L-shaped steel material 14 and the bar-shaped reinforcement 11 is fastened and fixed with a fixing metal fitting 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for preventing deformation of a reinforcing bar used to reinforce a structure such as a cast-in-place pile constructed of concrete, a fixing bracket used for the method, a reinforcing bar, and a method for installing the reinforcing bar. More specifically, a method for preventing deformation of a reinforcing bar rod suitable for preventing deformation such as mold deformation during assembling, transporting, building, etc. of the reinforcing bar rod, a reinforcing bar fixing bracket used in the method, and a reinforcing bar reinforced by using the bracket The present invention relates to a fence and a method for installing the reinforcing bar fence.

  In order to reinforce a concrete structure, a cast-in-place pile constructed of concrete uses an assembly called a reinforcing bar rod that is formed in a cylindrical shape by combining a number of reinforcing bars in a grid pattern.

  5A and 5B are diagrams showing an example of the structure of a conventional reinforcing bar rod, where FIG. 5A is a side view and FIG. 5B is a plan view. As shown in FIG. 5, the reinforcing bar rod 100 is generally configured to include a large number of main bars 101 arranged in the direction of the central axis on the circumference and a large number of hoop bars 102 substantially orthogonal to the main bars 101. The intersection of the main bar 101 and the hoop bar 102 is joined by iron wire binding, welding or the like. Moreover, the intersection part of the main reinforcement 101 and the hoop reinforcement 102 may be fixed with a clip metal fitting (not shown).

  Further, in order to increase the rigidity of the reinforcing bar 100, a reinforcing belt-like plate 103 is disposed so as to contact the main bar 101 from the inside of the reinforcing bar 100, and is fixed to the main bar 101 at the intersection with the main bar 101. Such a reinforcing bar 100 is disclosed in Patent Document 1 below.

  Such rebar rods 100 are often large, with diameters ranging from 0.6 m to several meters and lengths ranging from 12 m per rod, and the diameter of the main bar 101 is generally about 19 to 41 mm. For this reason, the weight of the entire reinforcing bar 100 is often extremely heavy.

  Since the reinforcing bar 100 is heavy in this way, for example, when it is used for a cast-in-place pile, when a place necessary for assembly can be secured near the built-in place of the reinforcing bar 100, it is close to the built-in place. The work method of assembling, transporting to the construction site, hanging and building in the excavation hole is adopted. On the other hand, when a place necessary for assembly cannot be secured, a method of assembling in another place, transporting to a building place and building it is adopted.

  If the rigidity of the reinforcing bar 100 is not sufficient in the process of assembling, transporting, and building the reinforcing bar 100 in such a manner, the reinforcing bar bar will have a slight impact during transportation or construction. Even if it is received, it loses its shape and deforms to become unusable.

  Therefore, in the case of a large-sized reinforcing bar rod (having a diameter of about 1600 mm or more in general), it is difficult to secure sufficient rigidity of the reinforcing rod rod only by reinforcement with the belt-like plate 103. Further measures are taken to prevent this.

  As a countermeasure, for example, as shown as a plan view in FIG. 6, reinforcing members 104 made of steel bars are assembled in a cross shape inside the reinforcing bar 100A, and both ends of the reinforcing member 104 are connected to the main reinforcing bars 101 or the strip-like plate 103. Or, as shown in a plan view in FIG. 7, a reinforcing material 105 made of steel bars is assembled in a cross-beam shape inside the reinforcing bar 100B, and both ends of the reinforcing material 105 are formed into a main reinforcing bar 101 or a strip shape. A method of joining the plate 103 by welding has been adopted.

  6 and 7, when it is difficult to ensure sufficient rigidity of the reinforcing bar rod, as shown in a plan view in FIG. A method is adopted in which an L-shaped steel material (L-shaped ring steel material) 106 processed into a ring shape in accordance with the inner diameter is arranged so as to contact the main bar 101 from the inside of the reinforcing bar 100C and is attached by welding at the intersection with the main bar 101. It was done.

  However, in the conventional method for preventing deformation of the reinforcing bar shown in FIG. 6, the reinforcing member 104 assembled in a cross shape is an obstacle to inserting a tremely pipe for placing underwater concrete after the reinforcing bar 100A is installed. Therefore, when reinforcing bar 100A is installed, it is necessary to sequentially remove the reinforcing material 104 assembled in a cross shape by gas cutting or the like, the work load at the time of construction increases, and the gas-cut reinforcing material 104 is There is a problem in that the length is short due to cutting and it is difficult to reuse, and the manufacturing cost of the reinforcing bar 100A is high.

  In addition, in the conventional method for preventing deformation of a reinforcing bar shown in FIG. 7, unlike the cross reinforcement shown in FIG. 6, the reinforcing member 105 assembled in a cross-girder shape is a major obstacle when inserting a tremy tube. Therefore, it is not necessary to cut the reinforcing material 105 at the time of construction. However, since the reinforcing material 105 is also buried as it is, the reinforcing material 105 cannot be collected and reused. There was a problem that the production cost was high.

  Further, the deformation prevention method using the L-shaped ring steel material 106 shown in FIG. 8 has a very high processing cost for processing the L-shaped steel material into a ring shape, and the methods shown in FIGS. 6 and 7 have sufficient rigidity. Currently, it is unavoidably adopted when it is difficult to increase it. In any case, in order to prevent deformation of the large-diameter reinforcing bar rod, the reinforcing materials 104 and 105 and the L-shaped ring steel member 106 that cannot be reused must be assembled for each reinforcing bar rod by welding, There was a problem that the production cost of the rebar was high.

  On the other hand, when constructing a large-diameter cast-in-place pile, in order to increase the strength of the pile head of the cast-in-place pile, the pile head may adopt a structure in which reinforcing bar rods are arranged in double. In this case, when the reinforcement member 105 or the L-shaped ring steel member 106 welded as shown in FIGS. 7 and 8 is used as the outer reinforcement rod, the inner reinforcement rod is built inside the outer reinforcement rod. At this time, since the inner reinforcing bar rod competes with the reinforcing material 105 and the L-shaped ring steel member 106 disposed inside the outer reinforcing rod rod, there is a problem that the inner reinforcing rod rod is not easily built.

Furthermore, if the gap between the outer reinforcing bar rod and the inner reinforcing rod rod is about 200 mm, the outer reinforcing rod rod can be handled by the reinforcing rod rod 100C reinforced with the L-shaped ring-shaped steel member 106 shown in FIG. However, in the case where the gap between the outer reinforcing bar rod and the inner reinforcing bar rod is designed to be narrower in order to increase the strength of the pile head, the reinforcing rod rod 100C shown in FIG. There was a problem that.
JP 2002-106113 A

Means for solving the problems and their effects

  The present invention has been made in view of the above-described problems, and can significantly reduce the cost for preventing deformation of the reinforcing bar rod, such as deformation of the reinforcing rod, which occurs in the process of assembling, transporting, and building the reinforcing rod. The method for preventing deformation of reinforcing bar rods, which can greatly increase the work efficiency of assembling the reinforcing bar rods and can also handle double arrangement of reinforcing rod rods with a narrow interval between the rods, and for fixing suitable for the implementation of the method It is an object of the present invention to provide a rebar bar that is assembled using a metal fitting, the fixing metal fitting, has high rigidity, and can reduce the cost, and a method for installing the rebar bar.

  In order to achieve the above object, a method for preventing deformation of a reinforcing bar rod according to the present invention (1) includes a plurality of rod-like bars arranged around a central axis substantially parallel to the central axis direction, and substantially orthogonal to the central axis. A method for preventing deformation of a reinforcing bar rod including a plurality of hoop bars arranged so as to intersect with the plurality of rod-shaped bars in a circumferential direction, and at predetermined intervals with respect to the central axis direction, One or more deformation preventing members for preventing deformation of the reinforcing bar rods are inserted into the reinforcing bar rods, and the inserted deformation preventing member is crossed with two rod-shaped bars of the plurality of rod-shaped bars, It is characterized in that the intersection between the deformation preventing member and the bar-like streak is fastened and fixed with a fixing bracket.

  According to the deformation prevention method (1) of the reinforcing bar rod, the countermeasure for preventing deformation of the reinforcing rod rod is taken by tightening and fixing the crossing portion of the deformation preventing member and the rod-shaped bar with the fixing bracket. Therefore, it is not necessary to perform welding that tends to cause individual differences in skills at an assembly site or the like, and a general worker can easily perform the operation of attaching the deformation preventing member. In addition, since the deformation preventing member can be reliably fixed to the bar-like bars by the fixing metal fittings, there is no risk that the bar-like bars and the like will be damaged by improper welding, and a high-quality stable reinforcing bar can be assembled. it can. Of course, it is possible to obtain a high deformation prevention effect during assembling, transporting and building.

  Further, by using the detachable deformation preventing member and the fixing bracket, it is possible to remove the deformation preventing member and the fixing bracket from the reinforcing bar rod when building into the excavation hole. Therefore, the deformation preventing member and the fixing bracket can be repeatedly used for assembling the reinforcing bar rod. Since several tens of reinforcing bars are usually used per construction, the cost of manufacturing the reinforcing bars per construction is greatly reduced by applying deformation prevention measures to all these reinforcing bars using the above method. be able to.

  Further, the deformation prevention method (2) of the reinforcing bar rod according to the present invention is the reinforcement in which the deformation preventing member is arranged substantially orthogonal to the inside of the plurality of bar-shaped bars in the deformation prevention method (1) of the reinforcing rod rod. It is characterized in that it is disposed in the vicinity of the belt-like plate for use.

  According to the deformation prevention method (2) for the reinforcing bar, even when an inexpensive flat steel material is used as the reinforcing strip, the deformation preventing member is attached to a position in the vicinity of the reinforcing strip. The strength of the reinforcing strip-shaped plate can be reinforced, and the rigidity of the reinforcing bar can be sufficiently increased. Therefore, even when assembling a reinforcing bar with a large diameter (for example, a diameter of 1600 mm or more), an inexpensive flat steel material is used without using an expensive L-shaped ring steel material instead of the reinforcing strip-shaped plate. The cost reduction effect of the reinforcing bar can be enhanced.

  Further, a fixing bracket (1) according to the present invention is a fixing bracket used in the deformation prevention method (1) or (2) of the reinforcing bar rod, and the plate-like body is folded back in a U-shape. A metal fitting body having a letter-shaped bent portion and left and right side pieces is formed, and an insertion groove for inserting a deformation preventing member is formed from one side edge of each of the left and right side pieces, and the top of the bent portion is formed. A fixing bracket, wherein an insertion hole for fixing bolt insertion is formed, and a nut communicating with the insertion hole is fixed inside the bent portion.

  According to the fixing bracket (1), the rod-like streak is inserted inside the bent portion, the deformation preventing member is inserted into the insertion groove, and the fixing bolt attached to the nut is tightened. By the simple operation, the deformation preventing member can be securely fixed to the rod-like muscle, and the rod-like muscle can be removed by simply loosening the fixing bolt and removing the deformation preventing member from the insertion groove. Therefore, anyone can attach and remove the deformation preventing member in a short time without requiring any special technique, and the manufacturing cost of the reinforcing bar can be greatly reduced.

  Further, the reinforcing bar rod (1) according to the present invention includes a plurality of rod-like bars arranged around the central axis substantially parallel to the central axis direction, and a plurality of the reinforcing bars in the circumferential direction substantially orthogonal to the central axis. One or more reinforcing bar rods configured to include a plurality of hoop bars arranged to intersect with the rod-shaped bars, and to prevent deformation of the reinforcing bar rods at predetermined intervals with respect to the central axis direction. The deformation preventing member is disposed so as to intersect with two of the plurality of rod-shaped bars, and the intersection between the deformation preventing member and the bar-shaped bars is fastened by the fixing bracket (1). It is characterized by having.

  According to the reinforcing bar rod (1), it is possible to make an assembly in which the intersection of the deformation preventing member and the rod-shaped bar is firmly fixed by the fixing bracket (1), and the fixing bracket allows the The deformation preventing member fixed to the rod-shaped bars can reliably prevent deformation of the reinforcing bar rod. In addition, the deformation preventing member and the fixing metal fitting (1) can be removed from the reinforcing bar rod and recovered when assembled in the excavation hole, and reused for assembling another reinforcing bar rod. It is possible to provide a reinforcing bar rod that does not waste the member and the fixing bracket (1).

  In addition, since the deformation preventing member can be removed from the reinforcing bar rod when it is installed in the excavation hole, it is possible to eliminate almost the portion protruding to the inside of the reinforcing rod rod, and to increase the inner space. . Therefore, even when another reinforcing bar rod (inner reinforcing bar rod) is arranged inside the reinforcing bar rod (when double rod arrangement is performed), the interval between the inner reinforcing rod rods is narrowed (that is, conventionally) Can be designed to further increase the strength of cast-in-place piles, and it is possible to fully handle double arrangement of reinforcing bar rods with narrow spacing It becomes.

  Further, in the reinforcing bar erection method (1) according to the present invention, the fixing bar which fixes the rod-shaped bar and the deformation preventing member when the reinforcing bar (1) is installed in the excavation hole. The deformation prevention member is pulled out from the reinforcing bar rod, the fixing bracket is removed from the rod-shaped bar and recovered, and then the reinforcing bar rod is inserted into the excavation hole.

  According to the method (1) of building up the reinforcing bar, the deformation preventing member and the fixing bracket can be easily recovered at the time of mounting in the excavation hole by a simple operation of loosening the fastening of the fixing bracket. It is possible to repeatedly use the deformation preventing member and the fixing bracket for assembling different reinforcing bar rods.

  In addition, since the deformation preventing member is recovered from the reinforcing bar rod when it is installed in the excavation hole, it is possible to eliminate almost the portion protruding to the inside of the reinforcing rod rod, so that the inner space can be made large. Therefore, even when another reinforcing bar rod (inner reinforcing bar rod) is arranged inside the reinforcing bar rod, the interval between the inner reinforcing bar rods is narrowed (that is, the inner reinforcing rod rod having a diameter larger than the conventional one). It is possible to perform a design that further increases the strength of the cast-in-place pile, and it is possible to perform double arrangement of the reinforcing bar rods having a narrow space between the rods.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method for preventing deformation of a reinforcing bar according to the present invention, a fixing bracket used for the method, a reinforcing bar, and a method for installing a reinforcing bar are described below with reference to the drawings. FIG. 1 is a partial perspective view showing the structure of a reinforcing bar rod assembled using the method for preventing deformation of a reinforcing bar rod according to the embodiment, and FIG. 2 is a reinforcing bar rod according to the embodiment shown in FIG. FIG.

  In the reinforcing bar rod 10 according to the embodiment, a plurality of hoop muscles 12 are wound around a plurality of main muscles (hereinafter referred to as rod-like muscles) 11 which are longitudinal bars. Each intersecting portion is fixed by welding or a clip metal fitting (not shown) and formed in a cylindrical shape.

  Further, a reinforcing strip plate 13 made of a flat steel plate is wound between the plurality of hoop bars 12 so as to be in contact with the rod-like bars 11 from the inside of the reinforcing bar rod 10, and The part is fixed by welding or a reinforcing bar fixing bracket (not shown). In addition, what was disclosed by Unexamined-Japanese-Patent No. 2004-353314 which this inventor developed can be used for the above-mentioned clip metal fitting and reinforcing metal fitting. The strip plate 13 is arranged at predetermined intervals (several meters) in the length direction of the reinforcing bar rod 10 in consideration of the length and diameter of the reinforcing bar rod 10.

  And the rod-shaped L-shaped steel material 14 as a deformation preventing member is assembled in a substantially cross-girder shape in the form of sandwiching each belt-like plate 13 in the vicinity of each belt-like plate 13 in this embodiment, Both ends of the L-shaped steel material 14 are arranged so as to intersect with two of the rod-shaped reinforcing bars 11, and the intersection of the L-shaped steel material 14 and the rod-shaped reinforcing bars 11 is fastened by the fixing bracket 20. Is fixed.

  FIG. 3 is a view showing a mode in which the crossing portion between the L-shaped steel material 14 and the rod-shaped bar 11 is fixed using the fixing bracket 20 used in the deformation prevention method for the reinforcing bar 10 according to the embodiment. Yes, (a) is a side view and (b) is a plan view.

  As shown in FIG. 3, the object to be fixed by the fixing metal fitting 20 is the rod-shaped streak 11 and the L-shaped steel material 14 as a deformation preventing member. It is fixed by the metal fitting 20.

  The fixing metal fitting 20 is configured to include a metal fitting body 24 having a U-shaped bent portion 21, a left piece 22, and a right piece 23 by folding a plate-like body into a U shape. The U-shaped bent portion 21 is a rod-like muscle insertion portion. An insertion groove 25 for inserting an L-shaped steel material is formed from one side edge of each of the left piece 22 and the right piece 23, and an insertion hole 26 for inserting a fixing bolt is formed at the top of the bent portion 21 serving as a rod-like muscle insertion portion. A nut 27 that is formed and communicates with the insertion hole 26 is fixed inside the bent portion 21, and a fixing bolt 28 is rotatably attached to the nut 27 through the insertion hole 26.

  When the assembled reinforcing bar 10 is transported by a truck or the like, a locking nut (not shown) for preventing loosening is bitten on the outside of the insertion hole 26 in order to prevent the fixing bolt 28 from loosening. It is preferable to attach the bolt 28, and in this case, the neck length of the fixing bolt 28 is set longer.

  Next, a method for assembling the L-shaped steel material 14 to the reinforcing bar 10 will be described. In the present embodiment, it is assumed that the L-shaped steel material 14 is assembled for each arrangement position of the belt-like plate 13.

  First, the reinforcing bar rod 10 in which the strip plate 13 and the hoop bar 12 are fixed to the bar-shaped bar 11 by a predetermined method is assembled. Next, two L-shaped steel members 14 are sequentially inserted into one side of the belt-like plate 13 at a position that is substantially parallel at a predetermined interval, and the outer surface of one piece of the L-shaped steel member 14 is a bar-shaped streak. After aligning the direction of each L-shaped steel material 14 so as to abut on 11, the both end portions of the L-shaped steel material 14 are arranged so as to intersect with the rod-like streaks 11.

  Then, the fixing metal fitting 20 is attached to the rod-like muscle 11 intersecting with the L-shaped steel material 14 (first, the rod-like muscle 11 is inserted into the rod-like muscle insertion portion 21), and the insertion groove 25 of the attached fixing metal fitting 20 is set to L. Fit into one piece of mold steel 14. Thereafter, the fixing bolt 28 mounted on the fixing bracket 20 is rotated, the tip of the fixing bolt 28 is pressed against the bar-shaped bar 11, and the intersection of the L-shaped steel material 14 and the bar-shaped bar 11 is tightened. As a result, the rod-shaped streaks 11 and the L-shaped steel material 14 are fixed.

  Next, the two L-shaped steel materials 14 are arranged at a predetermined interval on the other side surface side of the belt-shaped plate 13 so as to be substantially orthogonal to the two L-shaped steel materials 14 disposed on one side surface of the belt-shaped plate 13. The L-shaped steel members 14 are sequentially inserted in positions that are substantially parallel to each other, and the direction of each L-shaped steel member 14 is adjusted so that the outer surface of one piece of the L-shaped steel member 14 comes into contact with the rod-shaped streak 11. The both ends of are arranged so as to intersect with the rod-like muscle 11.

  Then, in the same manner as described above, the fixing metal fitting 20 is attached to the rod-shaped streak 11 intersecting with the L-shaped steel material 14, and the insertion groove 25 of the attached fixing metal fitting 20 is fitted into one piece of the L-shaped steel material 14. . Thereafter, the fixing bolt 28 mounted on the fixing bracket 20 is rotated, the tip of the fixing bolt 28 is pressed against the bar-shaped bar 11, and the intersection of the L-shaped steel material 14 and the bar-shaped bar 11 is tightened. As a result, the rod-shaped streaks 11 and the L-shaped steel material 14 are fixed.

  By performing the above assembling work for all the strip-like plates 13 of the reinforcing bar 10, the work of assembling the L-shaped steel material 14 in the form of a cross-girder in a form in which the belt-like plate 13 is sandwiched between the L-shaped steel materials 14, Proceed to the next step.

  Then, when the reinforcing bar 10 according to the embodiment in which the L-shaped steel material 14 is assembled by the above method is built in the excavation hole, the reinforcing bar 10 is erected and dropped into the excavation hole. , Loosen the fixing bolt 28 that is hinged to the nut 27 of the fixing bracket 20 that fixes the crossing portion of the rod-shaped streaks 11 and the L-shaped steel material 14 to release the fixed state of the L-shaped steel material 14, The L-shaped steel material 14 is sequentially pulled out from the reinforcing bar 10 and the fixing bracket 20 is sequentially removed from the bar-shaped bar 11 and the removed portion is inserted into the excavation hole. By reusing the removed L-shaped steel material 14 and the fixing bracket 20 for assembling another reinforcing bar rod, it is possible to significantly reduce the cost of the reinforcing bar rod.

  According to the method for preventing deformation of the reinforcing bar 10 according to the above-described embodiment, the crossing portion of the L-shaped steel material 14 and the bar-shaped reinforcing bar 11 is fastened and fixed by the fixing bracket 20, thereby preventing deformation of the reinforcing bar 10. Therefore, it is not necessary to perform welding that is likely to cause individual differences in skills at an assembly site or the like, and even an ordinary worker can easily perform the attaching work of the L-shaped steel material 14. In addition, since the L-shaped steel material 14 can be securely fixed to the bar-shaped bars 11 by the fixing bracket 20, the bar-shaped bars 11 and the like are not damaged by improper welding, and a high-quality stable bar 10 is assembled. Can do. Of course, it is possible to obtain a high deformation prevention effect during assembling, transporting and building.

  Further, by using the detachable L-type steel material 14 and the fixing bracket 20, the L-type steel material 14 and the fixing bracket 20 can be detached from the reinforcing bar 10 when being installed in the excavation hole. Therefore, the L-shaped steel material 14 and the fixing bracket 20 can be repeatedly used for assembling the reinforcing bar 10. Since several tens of reinforcing bar rods 10 are usually used per construction, the conventional method (the method shown in FIGS. 6 to 8) is applied to all the reinforcing bar rods by taking measures for preventing deformation by the above method. Compared with), the production cost of reinforcing bar per construction can be greatly reduced.

  Further, even when an inexpensive flat steel material is used as the reinforcing strip 13, the L-shaped steel 14 is assembled in the vicinity of the strip 13 (in the embodiment, with the strip 13 sandwiched). Thereby, the intensity | strength of the strip | belt-shaped board 13 can be reinforced and the rigidity of the reinforcing bar 10 can fully be improved. Therefore, even when the large-diameter rebar rod 10 is assembled, an inexpensive flat steel material can be used without using the expensive L-shaped ring steel material 106 (see FIG. 8) instead of the strip plate 13. The manufacturing cost of the reinforcing bar 10 can be reduced.

  In addition, according to the fixing bracket 20 according to the above embodiment, the rod-shaped streak 11 is inserted into the bar-shaped streak insertion portion inside the bent portion 21, the L-shaped steel material 14 is inserted into the insertion groove 25, and the nut 27 is The L-shaped steel material 14 can be securely fixed to the rod-like streak 11 by a simple operation of tightening the fixing bolt 28 that is mounted, and the L-shaped steel can be removed from the insertion groove 25 simply by loosening the fixing bolt 28 lightly. The steel material 14 can be removed and removed from the bar-shaped streak 11, and any person can attach and remove the L-shaped steel material 14 in a short time without requiring a special technique, and can be used repeatedly. It becomes possible, and the manufacturing cost of the reinforcing bar can be greatly reduced.

  Further, according to the reinforcing bar rod 10 according to the above embodiment, an assembly in which the intersecting portion of the L-shaped steel material 14 and the rod-shaped bar 11 is firmly fixed by the fixing bracket 20 can be obtained. Thus, deformation of the reinforcing bar 10 can be prevented by the L-shaped steel material 14 fixed to the bar-shaped bars 11.

  In addition, the L-shaped steel material 14 and the fixing bracket 20 can be removed from the rebar rod 10 and collected at the time of installation in the excavation hole and reused for assembling another rebar rod. The production cost of another reinforcing bar can be reduced without wasting the fixing bracket 20.

  Further, according to the method for installing the reinforcing bar 10 according to the above embodiment, the L-type steel material 14 and the fixing bracket 20 are installed in the excavation hole by a simple operation of loosening the fastening of the fixing bracket 20. It can sometimes be easily recovered, and the L-shaped steel material 14 and the fixing bracket 20 can be repeatedly used for assembling another reinforcing bar 10.

  Further, when removing, the L-shaped steel material 14 can be pulled out by simply loosening the fixing bolt 28 of the fixing bracket 20, and the number of times of fastening of the fixing bolt 28 when assembling to the reinforcing bar can be reduced again. It is possible to reduce the work load during removal and installation.

  In the method for preventing deformation of the reinforcing bar 10 according to the above-described embodiment, the case where the L-shaped steel material 14 as the deformation-preventing material is assembled in a cross-girder shape with the strip plate 13 sandwiched therebetween has been described. Alternatively, the strip plate 13 may be assembled in a cross-girder shape in a form that does not sandwich the strip plate 13 (for example, on one side of the strip plate 13). Further, the assembled shape of the L-shaped steel material 14 is not limited to the cross-girder shape, and various assembled shapes such as a cross shape, a triangular shape, and a glutinous net shape can be employed. It can be set in consideration of the diameter and length of the reinforcing bar.

  Moreover, in the said embodiment, although the case where the L-type steel material 14 was used as a deformation | transformation prevention material was demonstrated, as a deformation | transformation prevention material, steel pipe pipe, a bar steel material, etc. of bending strength other than the L-type steel material 14 were demonstrated. Various high-profile steel materials can be applied. In that case, the shape of the insertion groove 25 of the fixing bracket 20 may be changed in accordance with the shape of the steel material to be applied.

  Moreover, in order to increase the strength of the pile head of the cast-in-place pile, when adopting a structure in which the reinforcing bar rod 10 is arranged on the outer side and the inner side in the pile head, the reinforcing bar rod according to the above-described embodiment is used. 10 can be used as an outer cage or an inner cage.

  FIG. 4 shows a double rod using the reinforcing bar rod 10 according to the embodiment as the outer reinforcing rod rod 10A and the inner reinforcing rod rod 10B, and incorporating the outer reinforcing rod rod 10A and the inner reinforcing rod rod 10B having different diameters in the excavation hole 30. It is the top view which showed the state (The L-shaped steel material 14 and the fixing bracket 20 are the collect | recovered states).

  When the reinforcing bar rod 10 according to the embodiment is used for the outer reinforcing bar rod 10A of the double cage, there is almost no portion projecting to the inside of the outer reinforcing rod rod 10A as shown in the drawing (about the thickness of the strip 13). Therefore, the inner rebar rod 10B can be inserted inside the outer rebar rod 10A with a large inner diameter (insertion effective inner diameter), and there is almost no competition with the inner rebar rod 10, so that the inner rebar rod 10B is inserted. Becomes easy.

  That is, as shown in FIG. 4, it is possible to build the inner reinforcing bar rod 10 </ b> B having a larger diameter than the conventional one inside the outer reinforcing bar rod 10 </ b> A. For example, when the outer reinforcing bar 10A having a diameter of 2000 mm is used, when the conventional reinforcing bar 100C reinforced with the L-shaped ring steel 106 shown in FIG. 8 is used for the outer reinforcing bar, the L-shaped ring steel 106 In consideration of the covering thickness of the inner rebar, only a maximum of about 1600 mm in diameter can be applied to the inner rebar rod, and moreover, the construction is difficult because it competes with the L-shaped ring steel material 106 when the inner rebar rod is inserted. .

  On the other hand, when the reinforcing bar rod 10 according to the embodiment is used as the outer reinforcing bar rod 10A, the inner reinforcing rod rod 10B can be used without competing with the outer reinforcing rod rod 10A even when the one having a diameter of about 1850 mm is used. It is possible to design a high-strength cast-in-place pile in which the distance between the outer reinforcing bar rod 10A and the inner reinforcing bar rod 10B is narrower than that of the conventional method, and the reinforcing bar rod having a narrow gap between the rods. It is possible to sufficiently cope with the double arrangement.

It is a fragmentary perspective view of the reinforcing bar rod assembled using the deformation prevention method of the reinforcing bar rod according to the embodiment of the present invention. It is a top view of the reinforcing bar rod assembled using the deformation preventing method of the reinforcing bar rod according to the embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed the aspect which fixes the cross | intersection part of L-shaped steel materials and a rod-shaped reinforcement using the metal fitting for fixing used for the deformation | transformation prevention method of the reinforcing bar rod concerning embodiment, (a) is a side view. , (B) is a plan view. It is the top view which showed the state which used the reinforcement bar which concerns on embodiment, and stood the reinforcement bar twice in the excavation hole. It is a figure which shows one example of the structure of the conventional reinforcing bar cage, (a) is a side view, (b) is a top view. It is a top view which shows one example of the deformation | transformation prevention structure of the conventional reinforcing bar rod. It is a top view which shows an example of the deformation | transformation prevention structure of another conventional reinforcing bar rod. It is a top view which shows one example of the deformation | transformation prevention structure of another conventional reinforcing bar rod.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reinforcing bar 11 Bar-shaped bar 12 Hoop bar 13 Strip plate 14 L-shaped steel
20 Fixing bracket

Claims (5)

A plurality of rod-like bars arranged around the central axis substantially parallel to the central axis direction, and a plurality of hoops arranged in a circumferential direction substantially orthogonal to the central axis so as to intersect the plurality of rod-like bars. A method for preventing deformation of a reinforcing bar rod including a muscle,
One or more deformation preventing members for preventing deformation of the reinforcing bar rod are inserted into the reinforcing bar rod at predetermined intervals with respect to the central axis direction, and the inserted deformation preventing member is inserted among the plurality of rod-shaped bars. A method for preventing deformation of a reinforcing bar rod, comprising: intersecting two bar-shaped bars, and fixing by fixing a crossing portion of the deformation-preventing member and the bar-shaped bars with a fixing bracket.   2. The method of preventing deformation of a reinforcing bar rod according to claim 1, wherein the deformation preventing member is disposed in the vicinity of a reinforcing strip-shaped plate disposed substantially orthogonal to the inside of the plurality of bar-shaped bars. It is a metal fitting for fixation used for the deformation | transformation prevention method of the rebar rod of Claim 1 or Claim 2, Comprising: A plate-shaped object is folded in U shape and has a U-shaped bending part and the left and right piece. The bracket body is formed,
Insertion grooves for insertion of deformation preventing members are formed from one side edge of each of the left and right pieces,
An insertion hole for fixing bolt insertion is formed at the top of the bent portion,
A fixing metal fitting, wherein a nut communicating with the insertion hole is fixed inside the bent portion. A plurality of rod-like bars arranged around the central axis substantially parallel to the central axis direction, and a plurality of hoops arranged in a circumferential direction substantially orthogonal to the central axis so as to intersect the plurality of rod-like bars. A reinforcing bar rod including a bar, wherein at least one deformation preventing member for preventing deformation of the reinforcing bar bar at predetermined intervals with respect to the central axis direction, It is arranged so as to intersect with the two bar-shaped bars of
A reinforcing bar rod, wherein an intersection between the deformation preventing member and the bar-shaped bar is fastened by a fixing metal fitting according to claim 3. When building the reinforcing bar rod according to claim 4 into the excavation hole,
After loosening the fastening of the fixing bracket that fixes the rod-shaped streak and the deformation preventing member, pulling out the deformation preventing member from the rebar rod, and removing and recovering the fixing bracket from the rod-shaped streak, A rebar erection method, comprising inserting a rebar slab into the excavation hole.

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