JP4354365B2 - Main reinforcing bar connection method - Google Patents

Description

  This invention relates to the connection method of the main reinforcement in the construction process of a reinforced concrete structure.

  In a reinforced concrete structure in which a plurality of main reinforcing bars extending in a substantially vertical direction are arranged at predetermined intervals in a horizontal direction, such as a pier made of reinforced concrete, as described in, for example, “Patent Document 1”. The construction is performed by performing reinforcement arrangement and concrete placement for each construction section of a predetermined height.

Japanese Patent Laid-Open No. 10-82019

  When constructing such a reinforced concrete structure, a new main rebar is connected to each of a plurality of completed main reinforcing bars arranged so that the upper end protrudes from the upper surface of the finished concrete. However, when this connection is performed using a screw coupler, there are the following problems.

  In other words, when connecting using a screw-type coupler, a screw-type coupler is mounted in advance in the vicinity of the upper end of the installed main reinforcing bar or in the vicinity of the lower end of the new main reinforcing bar. The threaded coupler is rotated and moved to a position straddling both main reinforcing bars in a state where the main reinforcing bars are butted together. At that time, if the phase of the threaded part of the main reinforcing bar and the threaded part of the new main reinforcing bar are not aligned, the threaded coupler cannot be rotated to the specified position. It is necessary to align the phases of the screw portions of both main reinforcing bars by rotating the new main reinforcing bars in a state of being in contact with the upper end surface of the installed main reinforcing bars. However, since the main reinforcing bar generally has a considerable weight, the sliding resistance when rotating the new main reinforcing bar becomes considerably large, and the rotating work cannot be easily performed. There is.

  On the other hand, if the new main rebar is rotated with the lower end surface of the new main rebar slightly lifted from the upper end surface of the installed main rebar, the work itself of rotating the new main rebar becomes easy. However, if this is done, the new main rebar will float in the air, so when rotating the screw coupler to the specified position, the phases of the screw parts of both main rebars should be kept in phase. There is a problem that it is not easy to keep, and the workability becomes worse.

  The present invention has been made in view of such circumstances, and in the process of constructing a reinforced concrete structure, work efficiency when connecting a constructed main reinforcing bar and a new main reinforcing bar using a screw-type coupler. An object of the present invention is to provide a method for connecting main reinforcing bars capable of improving the strength.

  The present invention is intended to achieve the above object by using a predetermined rigid sphere.

That is, the main reinforcing bar connecting method according to the present invention is:
In the process of constructing a reinforced concrete structure in which a plurality of main reinforcing bars extending in a substantially vertical direction are arranged at predetermined intervals in the horizontal direction by arranging and placing concrete for each construction section of a predetermined height A method of connecting a new main reinforcing bar using a screw-type coupler to each of a plurality of installed main reinforcing bars arranged such that the upper end protrudes from the upper surface of the finished concrete,
A screw-type coupler is attached to the vicinity of the upper end of the constructed main rebar or the vicinity of the lower end of the new main reinforcing bar, and at least one rigid sphere is positioned and arranged on the upper end surface of the constructed main reinforcing bar so as to be able to roll. Thereafter, the lower end surface of the new main reinforcing bar is brought into contact with these rigid spheres, and in this state, the new main reinforcing bar is phased between the screw portion of the new main reinforcing bar and the screw portion of the constructed main reinforcing bar. Are rotated to a position straddling the constructed main reinforcing bar and the new main reinforcing bar, and then the two main reinforcing bars are connected to each other. .

  If the above-mentioned “reinforced concrete structure” is a reinforced concrete structure in which a plurality of main reinforcing bars extending in a substantially vertical direction are arranged at predetermined intervals in the horizontal direction, the specific shape is particularly limited. Instead, for example, a rectangular shape, a polygonal shape, a circular shape, or the like can be adopted as the horizontal sectional shape. Further, the “reinforced concrete structure” may have a hollow structure or a solid structure. Furthermore, the type of the “reinforced concrete structure” is not particularly limited, and for example, a bridge pier, a main tower, a tower, or the like can be adopted.

  If the above-mentioned “screw coupler” is configured to connect both main reinforcing bars by rotating the screw coupler to a position straddling the installed main reinforcing bar and the new main reinforcing bar, A specific configuration is not particularly limited.

  The “rigid sphere” is not particularly limited as long as it is a spherical rigid body.

  The specific number of the “at least one rigid sphere” is not particularly limited, and the phase of the screw portion is also determined with respect to the position on the upper end surface of the main reinforcing bar when the rigid sphere is positioned and arranged. The specific position is not particularly limited as long as it is a position where there is no possibility of falling off from the upper end surface of the completed main reinforcing bar while rotating a new main reinforcing bar for alignment.

  The above-mentioned “positioned and arranged so as to be able to roll” means that until the lower end surface of the new main reinforcing bar comes into contact with the at least one rigid ball, the rigid ball is inadvertently formed on the upper end surface of the installed main reinforcing bar. While positioning so as not to roll, after the lower end surface of the new main reinforcing bar comes into contact with the at least one rigid sphere, the upper end surface of the constructed main reinforcing bar and the lower end surface of the new main reinforcing bar It means that these rigid spheres are arranged in such a manner that they can be rolled by a horizontal relative displacement generated between them. At this time, the specific configuration for preventing the at least one rigid sphere from inadvertently rolling is not particularly limited.

  As shown in the above configuration, the main reinforcing bar connecting method according to the present invention is that the screw type coupler is attached to the vicinity of the upper end of the installed main reinforcing bar or the lower end of the new main reinforcing bar, After positioning and arranging at least one rigid sphere on the end face so that it can roll, the lower end face of the new main reinforcing bar is brought into contact with these rigid spheres. Rotate to the position where the phase with the threaded part of the reinforcing bar is aligned, and then rotate and move the screw coupler to a position straddling the installed main reinforcing bar and the new main reinforcing bar to connect these two main reinforcing bars. Therefore, the following effects can be obtained.

  That is, since at least one rigid sphere is interposed between the upper end surface of the constructed main reinforcing bar and the lower end surface of the new main reinforcing bar, when the new main reinforcing bar is rotated, Only the reaction force due to the rolling resistance of the at least one rigid sphere acts. Therefore, a new main reinforcing bar can be rotated with a slight force, and thereby the operation of aligning the phases of the screw portions of both main reinforcing bars can be easily performed.

  Further, at this time, the new main reinforcing bar is not in a state of floating in the air, and its lower end surface is in contact with the at least one rigid sphere, so when rotating the screw coupler, It is possible to easily maintain the phase of the screw portions of both main reinforcing bars in a uniform state, and thereby the operation of rotating and moving the threaded coupler to a predetermined position can be performed easily and stably.

  Therefore, according to this invention, in the process of constructing a reinforced concrete structure, the work efficiency at the time of connecting a construction completed main reinforcement and a new main reinforcement using a screw type coupler can be improved.

  In the above configuration, if the positioning of the at least one rigid sphere is performed by temporarily fixing the rigid sphere to the upper end surface of the constructed main rebar with an adhesive, the configuration of the main rebar is changed. The above-described effects can be obtained with a simple configuration. In this case, the specific configuration of the “adhesive” is not particularly limited, and for example, a glue, a gel-like sealing agent, a double-sided adhesive tape, and the like can be employed.

  Alternatively, in the above configuration, a recessed portion is formed in a substantially central portion of the upper end surface of the constructed main reinforcing bar, and the positioning and positioning of the at least one rigid sphere is performed by housing these rigid spheres in the recessed portion. If it does so, the operation | work which positions and arrange | positions the said at least 1 rigid ball | bowl to the upper end surface of a construction completed main reinforcement can be performed very easily. Here, as long as the above-mentioned “concave part” can be accommodated so that the at least one rigid sphere does not roll carelessly, the specific configuration such as shape and size thereof is particularly limited. is not. Moreover, this “concave part” may be formed in advance with respect to the main reinforcing bar that has been completed before construction, or is placed so that the upper end protrudes from the top surface of the concrete that has been constructed. Then, for example, it may be formed using a punch or the like.

  In this case, if a recessed portion is also formed in the substantially central portion of the lower end surface of the new main reinforcing bar, the new main rebar is brought into contact with the at least one rigid sphere. Since the rebar can be arranged almost coaxially with the installed main rebar, a new main rebar rotation operation to align the phases of the screw parts of both main rebars and a threaded coupler for connecting both main rebars The rotational movement work can be performed very easily.

  Further, in the above configuration, in a state in which the at least one rigid sphere is positioned and arranged with respect to a predetermined number of constructed main reinforcing bars, contact of the new main reinforcing bars with respect to the rigid spheres is sequentially performed for each constructed main reinforcing bar. If it carries out, the connection operation | work of both main reinforcing bars can be performed efficiently.

  Instead of doing this, in a state where the at least one rigid sphere is positioned and arranged with respect to a predetermined number of constructed main reinforcing bars, the contact of the new main reinforcing bars to these rigid spheres is applied to each constructed main reinforcing bar. On the other hand, if it is performed at the same time, the connecting work of both main reinforcing bars can be performed simultaneously at a plurality of locations, thereby further improving the work efficiency.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a reinforced concrete structure 10 that is an object of a main reinforcing bar connection method according to an embodiment of the present invention in the middle of its construction.

  As shown in the figure, the reinforced concrete structure 10 is a structure such as a reinforced concrete bridge, and has a predetermined height (for example, about 6 m) construction section (a range up to a height indicated by a two-dot chain line in the figure). It is constructed by placing reinforcement and placing concrete every time.

  In the construction stage shown in the figure, a plurality of constructed main reinforcing bars 14 extending in the vertical direction are arranged at predetermined intervals in the horizontal direction with their upper ends protruding from the upper surface of the finished concrete 12. A new main reinforcing bar 16 is connected to each of the plurality of constructed main reinforcing bars 14 by a screw-type coupler 18. At that time, the connecting positions of the constructed main reinforcing bars 14 and the new main reinforcing bars 16 are set to different height positions every other.

  Each of the constructed main reinforcing bars 14 and each of the new main reinforcing bars 16 is constituted by a large-diameter deformed reinforcing bar (for example, D51) having a length of about 6 m, and screw portions 14b and 16b (see FIG. 3) on the outer peripheral surface thereof. ) Is formed.

  FIG. 2 is a side view showing an outline of a process of connecting a new main reinforcing bar 16 to the constructed main reinforcing bar 14.

  As shown in the figure, in the main reinforcing bar connecting step, eight new main reinforcing bars 16 are suspended by the lifting tool 100 and are connected to the constructed main reinforcing bars 14 one by one. ing. The figure (a) has shown the state just before eight new main reinforcing bars 16 are connected, and the figure (b) has shown the state in which the one part was connected.

  The suspension tool 100 includes a suspension beam 102 extending in the horizontal direction, eight brackets 104 provided at equal intervals on the lower surface of the suspension beam 102, and eight suspension wires 106 locked to the brackets 104. And a pair of brackets 108 provided on the upper surface of the suspension beam 102, and a wire 110 for lifting the suspension device 100 with a crane or the like is locked to the pair of brackets 108. ing.

  The interval between the brackets 104 is set to a value equal to the interval between the constructed main reinforcing bars 14 in the reinforced concrete structure 10, whereby each of the new main reinforcing bars 16 suspended by the hanging wires 106 is added to the brackets 104. It can be made to face with respect to the construction completed main reinforcement 14 now. At this time, the lengths of the eight suspension wires 106 are set to different lengths, and when the suspension tool 100 is lowered by this, the lower end surface 16a of each new main reinforcing bar 16 and each construction completed main body 16 are set. The distance from the upper end surface 14a of the reinforcing bar 14 is set to a slightly different value.

  Specifically, as shown in FIG. 5A, when the hanger 100 is lowered, the lower end surface 16a of the new main reinforcing bar 16 positioned at the right end among the eight new main reinforcing bars 16 is first displayed. The distance between the lower end surface 16a of the new main reinforcing bar 16 and the upper end surface 14a of the completed main reinforcing bar 14 increases little by little as it approaches the upper end surface 14a of the completed main reinforcing bar 14 and becomes the second and third from the right end. It is trying to become.

  In the main reinforcing bar connecting step, before the hanger 100 is lowered, the threaded coupler 18 is attached to the vicinity of the upper end of each of the eight installed main reinforcing bars 14 to be connected.

  FIG. 3 is a detailed view of part III in FIG.

  As shown in the figure, the connection between the constructed main reinforcing bar 14 and the new main reinforcing bar 16 is performed between the upper end surface 14 a of the constructed main reinforcing bar 14 and the lower end surface 16 a of the new main reinforcing bar 16 with one rigidity. The operation is performed with the ball 20 interposed. As the rigid sphere 20, for example, a steel ball having a diameter of about 3 to 5 mm is used.

  In the following, a set of main reinforcing bars 14 and a new main reinforcing bar 16 will be taken up and the connecting method will be described.

  4 and 5 are process diagrams for explaining this connection method, and FIG. 4B is a detailed view of the IVb portion of FIG.

  First, as shown to Fig.4 (a), in the state which has positioned the rigid ball | bowl 20 on the upper end surface 14a of the construction completed main rebar 14 so that rolling is possible, the new main rebar 16 is dropped from the upper direction, The lower end surface 16a is brought close to the upper end surface 14a of the main reinforcing bar 14 that has been constructed. At that time, the positioning and arrangement of the rigid spheres 20 are performed by accommodating the rigid spheres 20 in the recessed portions 14c formed on the upper end surface 14a of the finished main rebar 14. This recessed part 14c is previously formed with respect to the construction completed main rebar 14 before construction. On the other hand, a recessed portion 16 c is also formed in advance on the lower end surface 16 a of the new main reinforcing bar 16.

  Then, as shown in FIG. 2B, after the new main reinforcing bar 16 is lowered to a position where the lower end surface 16a abuts against the rigid sphere 20, the new main reinforcing bar 16 is moved around the central axis. By rotating in either direction, the phases of the threaded portion 16b and the threaded portion 14b of the finished main reinforcing bar 14 are aligned.

  Next, as shown in FIG. 5C, the screw coupler 18 is rotated upward. And as shown in the figure (d), the screw type coupler 18 is rotationally moved to the position which straddles the construction completed main reinforcement 14 and the new main reinforcement 16 substantially equally, and both the main reinforcements 14 and 16 are connected. .

  6A is a detailed view of the VIa portion of FIG. 4B, and FIG. 6B is a view taken along the line bb of FIG.

  As shown in the figure, the recessed portion 14 c is formed in a substantially spherical shape at a substantially central portion of the upper end surface 14 a of the finished main reinforcing bar 14, whereby the rigid sphere 20 is formed in a substantially central axis of the finished main reinforcing bar 14. To be positioned on top. On the other hand, the recessed portion 16 c is also formed in a substantially spherical shape at a substantially central portion of the lower end surface 16 a of the new main reinforcing bar 16, whereby the new main reinforcing bar 16 is lowered and the lower end surface 16 a becomes the rigid sphere 20. When abutting, the abutting position is set to be approximately the center of the recessed portion 16c. Thereby, a new main reinforcing bar 16 can be arranged substantially coaxially with the constructed main reinforcing bar 14.

  Further, as shown in the figure, a hexagonal cross-section coupler having a threaded portion 18a screwed with the threaded portions 14b and 16b of both main reinforcing bars 14 and 16 is used as the threaded coupler 18.

  As described above, when the connection of one set of the main reinforcing bar 14 and the new main reinforcing bar 16 is completed, as shown in FIG. 2 (b), the lifting device 100 is slightly lowered and the connection is completed immediately before. The lower end surface 16a of the new main reinforcing bar 16 adjacent to the left side of the new main reinforcing bar 16 is brought into contact with the rigid sphere 20 positioned and arranged on the upper end surface 14a of the completed main reinforcing bar 14, and the connection is made.

  Thereafter, the connection work of each group is sequentially performed in the same manner, and when the connection work for eight groups is completed, the next eight new main reinforcing bars 16 are suspended by the hanger 100 and connected to the constructed main reinforcing bars 14. I do.

  As described above in detail, in the main reinforcing bar connection method according to the present embodiment, the screw-type coupler 18 is attached to the vicinity of the upper end of the finished main reinforcing bar 14, and one rigid ball 20 is rolled on the upper end surface 14a. After the positioning and disposition so as to be movable, the lower end surface 16a of the new main reinforcing bar 16 is brought into contact with the rigid sphere 20, and in this state, the new main reinforcing bar 16 is screwed with the threaded portion 16b and the screw of the main reinforcing bar 14 which has been constructed. Rotate to a position where the phase with the portion 14b is aligned, and then rotate and move the screw coupler 18 to a position straddling the constructed main rebar 14 and the new main rebar 16 so as to connect these main rebars 14 and 16 together. Therefore, the following effects can be obtained.

  That is, since the rigid sphere 20 is interposed between the upper end surface 14a of the constructed main reinforcing bar 14 and the lower end surface 16a of the new main reinforcing bar 16, when the new main reinforcing bar 16 is rotated, the new main reinforcing bar 16 is rotated. Only the reaction force due to the rolling resistance of the rigid sphere 20 acts on the main rebar 16. Therefore, the new main reinforcing bar 16 can be rotated with a slight force, whereby the phases of the threaded portion 14b of the installed main reinforcing bar 14 and the screwed portion 16b of the new main reinforcing bar 16 can be easily aligned.

  At this time, the new main reinforcing bar 16 is not in a suspended state, and its lower end surface 16a is in contact with the rigid sphere 20, so that when the screw coupler 18 is rotated, It is possible to easily maintain the phase of the screw portions 14b, 16b of both the main reinforcing bars 14, 16 in the same state, and thereby the operation of rotating and moving the screw coupler 18 to a predetermined position easily and stably. It can be carried out.

  Therefore, according to this embodiment, in the process of constructing the reinforced concrete structure 10, it is possible to increase the working efficiency when connecting the completed main reinforcing bar 14 and the new main reinforcing bar 16 using the screw coupler 18.

  In particular, in the present embodiment, a concave portion 14c is formed in a substantially central portion of the upper end surface 14a of the finished main reinforcing bar 14, and the rigid sphere 20 is positioned by accommodating the rigid sphere 20 in the concave portion 14c. Since they are arranged, this positioning and arrangement work can be performed very easily.

  In addition, in the present embodiment, the recessed portion 16c is formed in the substantially central portion of the lower end surface 16a of the new main reinforcing bar 16, so that the lower end surface 16a is brought into contact with the rigid sphere 20. Sometimes, a new main reinforcing bar 16 can be arranged substantially coaxially with the constructed main reinforcing bar 14. Therefore, a new main rebar 16 rotation operation for aligning the phases of the screw portions of both main rebars 14 and 16 and a rotational movement operation of the screw coupler 18 for connecting both main rebars 14 and 16 are very easily performed. be able to.

  Further, in the present embodiment, in a state where the rigid spheres 20 are positioned and arranged for each of the eight constructed main reinforcing bars 14, the new main reinforcing bars 16 are brought into contact with the rigid spheres 20. Since the rebars 14 are sequentially performed, the connecting work of the main rebars 14 and 16 can be performed efficiently.

  In the present embodiment, before the hanger 100 is lowered, the threaded coupler 18 is attached to the vicinity of the upper end of each of the eight installed main reinforcing bars 14 to be connected. However, instead of doing this, each of the eight new main reinforcing bars 16 to be connected may be fitted with a screw coupler 18 in the vicinity of the lower end thereof. .

  Next, a modification of the above embodiment will be described.

  FIG. 7 is a view similar to FIG. 6, showing a first modification of the embodiment.

  In this modification, the main reinforcing bars 14, 16 are connected with three rigid balls 22 interposed between the upper end surface 14 a of the constructed main reinforcing bar 14 and the lower end surface 16 a of the new main reinforcing bar 16. Is supposed to do. At this time, a steel ball having a slightly smaller diameter than the rigid sphere 20 of the above embodiment is used as each rigid sphere 22.

  These three rigid spheres 22 are positioned and arranged on the upper end surface 14a of the constructed main reinforcing bar 14 while being accommodated in the recessed portion 14c, but the recessed portion 14c is formed in a spherical shape at a substantially central portion of the upper end surface 14a. Therefore, the three rigid spheres 22 are arranged in close contact with each other so as to surround the central axis of the constructed main rebar 14.

  Even when the configuration of the present modification is employed, the work efficiency when the installed main reinforcing bar 14 and the new main reinforcing bar 16 are connected using the screw coupler 18 can be increased as in the above embodiment.

  In particular, by using the three rigid spheres 22 as in this modification, the lower end surface 16a of the new main reinforcing bar 16 can be received at three points, so that the phases of the screw portions of both the main reinforcing bars 14 and 16 are aligned. Therefore, the rotation operation of the new main reinforcing bar 16 can be performed more easily.

  In this modification, in order to make the interval between the upper end surface 14a of the constructed main reinforcing bar 14 and the lower end surface 16a of the new main reinforcing bar 16 substantially the same value as in the above-described embodiment, Although a steel ball having a slightly smaller diameter than the rigid sphere 20 of the above embodiment is used, it is of course possible to use the rigid sphere 20 of the above embodiment as it is.

  Further, instead of using the three rigid spheres 22 as in the present modification, it is possible to use two or four or more rigid spheres.

  FIG. 8 is a view similar to FIG. 6, showing a second modification of the embodiment.

  In this modified example, the diameter of the slightly larger diameter than the rigid sphere 20 of the above embodiment is provided between the upper end surface 14a of the constructed main reinforcing bar 14 and the lower end surface 16a of the new main reinforcing bar 16 as in the case of the above embodiment. The two main reinforcing bars 14 and 16 are connected in a state where one small rigid ball 24 is interposed. However, as in the above-described embodiment, the main reinforcing bars 14 and 16 are connected to each other without forming the recessed portion 16c in the substantially central portion of the lower end surface 16a of the new main reinforcing bar 16.

  Even when the configuration of the present modification is employed, the work efficiency when the installed main reinforcing bar 14 and the new main reinforcing bar 16 are connected using the screw coupler 18 can be increased as in the above embodiment.

  In this modification, when the lower end surface 16a of the new main reinforcing bar 16 is brought into contact with the rigid sphere 24, the new main reinforcing bar 16 is automatically arranged substantially coaxially with the constructed main reinforcing bar 14. However, it is possible to save the trouble of forming the recessed portion 16 c in the lower end surface 16 a of the new main reinforcing bar 16. In this case, after the constructed main rebar 14 is arranged so that the upper end portion protrudes from the upper surface of the constructed concrete 12, the recessed portion 14c is formed on the upper end surface 14a using a punch or the like. If it forms, the pre-processing with respect to both the main reinforcing bars 14 and 16 can be made unnecessary.

  In this modification, the interval between the upper end surface 14a of the constructed main reinforcing bar 14 and the lower end surface 16a of the new main reinforcing bar 16 is set to substantially the same value as in the above embodiment. Although a steel ball having a slightly smaller diameter than the rigid sphere 20 of the embodiment is used, it is of course possible to use the rigid sphere 20 of the above embodiment as it is.

  FIG. 9 is a view similar to FIG. 6, showing a third modification of the embodiment.

  In this modification, as in the case of the above-described embodiment, the diameter between the upper end surface 14a of the constructed main reinforcing bar 14 and the lower end surface 16a of the new main reinforcing bar 16 is somewhat larger than that of the rigid sphere 20 of the above-described embodiment. The main rebars 14 and 16 are connected with one small rigid ball 26 interposed. However, as in the above embodiment, the main reinforcing bars 14 and 16 are connected to each other without forming the recessed portions 14c and 16c on the upper end surface 14a of the constructed main reinforcing bar 14 and the lower end surface 16a of the new main reinforcing bar 16. It is like that.

  That is, in this modified example, the positioning of the rigid spheres 26 with respect to the upper end surface 14a of the constructed main reinforcing bar 14 is temporarily fixed to the upper end surface 14a with the adhesive 30 made of a gel-like sealing agent. It is to be done by. Specifically, a predetermined amount of the adhesive 30 is supplied to the upper end surface 14a, and the rigid sphere 26 is arranged at the substantially central portion of the upper end surface 14a, thereby taking the rigid sphere 26 into the adhesive 30 and positioning the rigid sphere 26. Arrangement is to be made.

  Even when the configuration of the present modification is employed, the work efficiency when the installed main reinforcing bar 14 and the new main reinforcing bar 16 are connected using the screw coupler 18 can be increased as in the above embodiment.

  In this modification, when the lower end surface 16a of the new main reinforcing bar 16 is brought into contact with the rigid sphere 26, the new main reinforcing bar 16 is automatically arranged substantially coaxially with the constructed main reinforcing bar 14. However, it is possible to save the trouble of forming the recessed portions 14 c and 16 c in the upper end surface 14 a of the constructed main reinforcing bar 14 and the lower end surface 16 a of the new main reinforcing bar 16. Therefore, the pre-processing with respect to both main reinforcing bars 14 and 16 can be made unnecessary.

  In the present modification, the interval between the upper end surface 14a of the constructed main reinforcing bar 14 and the lower end surface 16a of the new main reinforcing bar 16 is set to substantially the same value as in the above embodiment. Although a steel ball having a diameter somewhat smaller than that of the rigid sphere 20 of the embodiment is used, it is of course possible to use the rigid sphere 20 of the above embodiment as it is.

  FIG. 10 is a view similar to FIG. 6, showing a fourth modification of the embodiment.

  In the present modified example, as in the case of the third modified example, the rigid sphere 20 of the above embodiment is to some extent between the upper end surface 14a of the constructed main reinforcing bar 14 and the lower end surface 16a of the new main reinforcing bar 16. The main rebars 14 and 16 are connected with a rigid sphere 28 having a small diameter interposed therebetween.

  However, in this modification, the positioning and arrangement of the rigid spheres 28 with respect to the upper end surface 14a of the constructed main reinforcing bar 14 is substantially the center of the upper end surface 14a with the adhesive 32 made of glue applied to the upper end surface 14a. Three rigid spheres 28 are arranged in the part and temporarily fixed.

  Even in the case of adopting the configuration of the present modification, as in the third modification, it is possible to improve the work efficiency when connecting the completed main rebar 14 and the new main rebar 16 using the screw coupler 18. it can.

  In the present modification, since the three rigid spheres 28 are used, the lower end surface 16a of the new main reinforcing bar 16 can be received at three points, whereby the screw portions 14b and 16b of both the main reinforcing bars 14 and 16 can be received. The new main rebar 16 can be rotated more easily to align the phase than in the third modification.

  In the present modification, as in the third modification, when the lower end surface 16a of the new main reinforcing bar 16 is brought into contact with the rigid sphere 26, the new main reinforcing bar 16 is automatically installed. However, it is possible to save the trouble of forming the recessed portions 14c and 16c in the upper end surface 14a of the constructed main reinforcing bar 14 and the lower end surface 16a of the new main reinforcing bar 16. Therefore, the pre-processing with respect to both main reinforcing bars 14 and 16 can be made unnecessary.

  Instead of applying the adhesive 32 made of glue to the upper end surface 14a of the finished main reinforcing bar 14 as in this modification, three rigid spheres 28 are attached by sticking a double-sided adhesive tape to the upper end surface 14a. It is also possible to temporarily fix.

  Further, instead of using the three rigid spheres 28 as in the present modification, it is possible to use two or four or more rigid spheres.

  FIG. 11 is a view similar to FIG. 3, showing a fifth modification of the embodiment.

  In this modified example, as in the above embodiment, the two main main bars 14 are interposed between the upper end surface 14a of the constructed main rebar 14 and the lower end surface 16a of the new main rebar 16 with one rigid sphere 20 interposed therebetween. The rebars 14 and 16 are connected to each other, and the screw type coupler 18 is attached to the vicinity of the upper end of each of the eight installed main rebars 14 to be connected. In this case, the present embodiment is different from the above-described embodiment in that a screw type coupler 38 is attached to the vicinity of the lower end of each of the eight new main reinforcing bars 16 to be connected.

  The threaded coupler 38 has the same configuration as the threaded coupler 18, and the mounting position of the threaded coupler 38 is such that the lower end edge of the threaded coupler 38 extends from the lower end surface 16 a of the main reinforcing bar 16 to the threaded coupler 18. It is set so as to be located about half of the entire length.

  Even when the configuration of the present modification is employed, the work efficiency when the installed main reinforcing bar 14 and the new main reinforcing bar 16 are connected using the screw coupler 18 can be increased as in the above embodiment.

  In particular, if the screw coupler 38 is attached to the vicinity of the lower end of the new main reinforcing bar 16 as in this modification, when the screw coupler 18 is rotated, the screw coupler 18 is screwed. By rotating and moving to the position where it abuts on the type coupler 38, the screw type coupler 18 can be reliably positioned at a position substantially evenly straddling the constructed main reinforcing bar 14 and the new main reinforcing bar 16.

  In addition, at that time, the screw-type coupler 18 is brought into contact with the screw-type coupler 38 to prevent the position of the screw-type coupler 18 from being inadvertently shifted.

  It should be noted that a lock nut or the like can be used instead of using the screw coupler 38 having the same configuration as the screw coupler 18 as in this modification.

  FIG. 12 is a view similar to FIG. 2, showing a sixth modification of the embodiment.

  In the above-described embodiment, the positioning of the rigid sphere 20 with respect to each of the eight installed main reinforcing bars 14 makes contact with the new main reinforcing bar 16 with respect to the rigid sphere 20. However, in this modification, a new sphere 20 is newly positioned in the state where the rigid sphere 20 is positioned and arranged for each of the eight installed main reinforcing bars 14. The main reinforcing bars 16 are brought into contact with each of the constructed main reinforcing bars 14 at the same time.

  In order to realize this, the lengths of the eight hanging wires 106 are set to the same length every other wire.

  Even when the configuration of the present modification is employed, the work efficiency when the installed main reinforcing bar 14 and the new main reinforcing bar 16 are connected using the screw coupler 18 can be increased as in the above embodiment.

  In particular, the work efficiency of the connecting work can be further increased by performing the connecting work of the main reinforcing bars 14 and 16 simultaneously in eight places as in this modification.

The side view which shows the reinforced concrete structure used as the object of the connection method of the main reinforcement which concerns on one Embodiment of this invention in the state in the middle of the construction In the said embodiment, it is a side view which shows the outline | summary of the process of connecting a new main reinforcement to a construction completed main reinforcement, Comprising: The same figure (a) shows the state just before 8 new main reinforcement is connected. The figure, the figure (b) is the figure which shows the state where the part is connected Detailed view of part III in Fig. 2 Process diagram for explaining the connecting method (part 1) Process drawing for explaining the above connecting method (part 2) Fig. 4 (a) is a detailed view of the VIa portion of Fig. 4 (b), and Fig. 4 (b) is a view taken along the line bb. The same figure as FIG. 6 which shows the 1st modification of the said embodiment. The same figure as FIG. 6 which shows the 2nd modification of the said embodiment. The same figure as FIG. 6 which shows the 3rd modification of the said embodiment. The same figure as FIG. 6 which shows the 4th modification of the said embodiment. The same figure as FIG. 3 which shows the 5th modification of the said embodiment. The figure similar to FIG. 2 which shows the 6th modification of the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reinforced concrete structure 12 Installed concrete 14 Installed main rebar 14a Upper end surface 14b, 16b, 18a Screw part 14c, 16c Recessed part 16 New main reinforcing bar 16a Lower end face 18, 38 Screw type coupler 20, 22, 24, 26, 28 Rigid sphere 30, 32 Adhesive 100 Suspension tool 102 Suspension beam 104, 108 Bracket 106 Suspension wire 110 Wire

Claims (6)

In the process of constructing a reinforced concrete structure in which a plurality of main reinforcing bars extending in a substantially vertical direction are arranged at predetermined intervals in the horizontal direction by arranging and placing concrete for each construction section of a predetermined height A method of connecting a new main reinforcing bar using a screw-type coupler to each of a plurality of installed main reinforcing bars arranged such that the upper end protrudes from the upper surface of the finished concrete,
A screw-type coupler is attached to the vicinity of the upper end of the constructed main rebar or the vicinity of the lower end of the new main reinforcing bar, and at least one rigid sphere is positioned and arranged on the upper end surface of the constructed main reinforcing bar so as to be able to roll. Thereafter, the lower end surface of the new main reinforcing bar is brought into contact with these rigid spheres, and in this state, the new main reinforcing bar is phased between the screw portion of the new main reinforcing bar and the screw portion of the constructed main reinforcing bar. The screw-type coupler is rotated to a position straddling the constructed main rebar and the new main rebar to connect both main rebars. Consolidation method.   The main reinforcing bar connecting method according to claim 1, wherein the positioning and positioning of the at least one rigid sphere is performed by temporarily fixing the rigid sphere to an upper end surface of the constructed main reinforcing bar with an adhesive. Form a recess in the approximate center of the upper end surface of the constructed main rebar,
The main reinforcing bar connecting method according to claim 1, wherein the positioning and positioning of the at least one rigid sphere is performed by accommodating the rigid sphere in the recessed portion.   4. The method of connecting main reinforcing bars according to claim 3, wherein a concave portion is also formed in a substantially central portion of the lower end surface of the new main reinforcing bar.   In a state where the at least one rigid sphere is positioned and arranged for each of the predetermined number of the constructed main reinforcing bars, the contact of the new main reinforcing bars to the rigid spheres is performed for each of the constructed main reinforcing bars. The method for connecting main reinforcing bars according to any one of claims 1 to 4, wherein the connecting method is performed sequentially.   With the at least one rigid sphere positioned and arranged with respect to each of the predetermined number of the constructed main reinforcing bars, the contact of the new main reinforcing bars with the rigid spheres is performed with respect to each of the constructed main reinforcing bars. The method for connecting main reinforcing bars according to any one of claims 1 to 4, wherein the connecting method is performed simultaneously.

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