JP6854652B2 - Reinforcing bar assembly method and rebar assembly jig - Google Patents

Description

The present invention relates to a reinforcing bar assembling method and a reinforcing bar assembling jig.

A method has been proposed for assembling the reinforcing bars of a reinforced concrete structure in which reinforcing bars are arranged inside the concrete before placing the concrete. For example, in Patent Document 1, a method of using a pair of left and right horizontal bar rails provided with grooves at intervals equal to the pitch of reinforcing bars and a pair of front and rear vertical bar rails provided with grooves similar to the rails for horizontal bars. Is disclosed. In the method of Patent Document 1, the horizontal bar rails and the vertical bar rails are alternately inclined, and the reinforcing bars placed on the rails roll down on the rails due to gravity and enter the grooves, so that the reinforcing bars are arranged at a predetermined pitch. Rail.

Japanese Patent No. 2544874

By the way, in a reinforced concrete structure such as a reinforcing bar cage, there may be a place where a plurality of reinforcing bars are arranged adjacent to each other in the lateral direction at a corner portion between a bottom surface and a side surface. However, the above technique cannot be applied to a place where a plurality of reinforcing bars are arranged adjacent to each other in the lateral direction. Therefore, assembling the reinforcing bars at the locations where the plurality of reinforcing bars are arranged adjacent to each other in the lateral direction is manually performed, and improvement is desired.

Therefore, an object of the present invention is to provide a reinforcing bar assembling method and a reinforcing bar assembling jig capable of improving the efficiency of assembling the reinforcing bars at a location where a plurality of reinforcing bars are arranged adjacent to each other in the lateral direction. ..

The present invention is a reinforcing bar assembling method for assembling the reinforcing bars of a reinforced concrete structure in which reinforcing bars are arranged inside concrete before placing concrete, and a plurality of reinforcing bars in the reinforced concrete structure are laterally adjacent to each other. A jig arranging step and a jig arranging step of arranging a reinforcing bar assembling jig having a groove formed in which a plurality of reinforcing bars are accommodated while being adjacent to each other in the lateral direction at a position corresponding to a place where the reinforcing bars are arranged. This is a reinforcing bar assembling method including a reinforcing bar arranging step of arranging the reinforcing bars so that a plurality of reinforcing bars are accommodated while being adjacent to each other in the lateral direction in the groove portion of the reinforcing bar assembling jig arranged in.

According to this configuration, in the reinforcing bar assembling method for assembling the reinforcing bars of the reinforcing bar concrete structure in which the reinforcing bars are arranged inside the concrete before placing the concrete, in the jig placement process, a plurality of reinforcing bars in the reinforcing bar concrete structure are assembled. Reinforcing bar assembling jigs having grooves formed in which a plurality of reinforcing bars are accommodated while being adjacent to each other in the lateral direction are arranged at positions corresponding to the locations where the reinforcing bars are arranged adjacent to each other in the lateral direction. Then, the reinforcing bars are arranged so that the plurality of reinforcing bars are accommodated in the grooves of the reinforcing bar assembling jig arranged in the jig arrangement step while being adjacent to each other in the lateral direction. As a result, the reinforcing bars can be arranged at an accurate position simply by arranging the reinforcing bars adjacent to each other in the groove portion of the reinforcing bar assembly jig. Therefore, in a place where a plurality of reinforcing bars are arranged adjacent to each other in the lateral direction. The efficiency of rebar assembly can be improved.

In this case, the reinforcing bar assembling jig arranged in the jig arranging process extends from the bottom plate in contact with the floor surface on which the reinforcing bar assembling jig is arranged while bending upward from the first end portion of the bottom plate. It has a 1-side plate and a 2nd side plate extending upward from the 2nd end of the bottom plate opposite to the 1st end, and grooves are provided at the upper ends of the 1st side plate and the 2nd side plate. It is preferable that the jig is used.

According to this configuration, the reinforcing bar assembly jig arranged in the jig arrangement process extends from the bottom plate in contact with the floor surface on which the reinforcing bar assembly jig is arranged and the first end portion of the bottom plate while bending upward. It has an existing first side plate and a second side plate extending upward from the second end of the bottom plate opposite to the first end, and the groove portion is the upper end of the first side plate and the second side plate. Since it is provided in, it is possible to easily form a reinforcing bar assembly jig at low cost.

Further, in the reinforcing bar arrangement step, it is preferable to arrange the reinforcing bars at the corners of the reinforcing bar cage in which the reinforcing bars on the bottom surface of the reinforcing bar cage and the reinforcing bars on the side surfaces of the reinforcing bar cage are adjacent to each other in the lateral direction.

According to this configuration, in the reinforcing bar arranging step, the reinforcing bars at the corners of the reinforcing bar cage in which the reinforcing bars on the bottom surface of the reinforcing bar cage and the reinforcing bars on the side surfaces of the reinforcing bar cage are laterally adjacent to each other are arranged. Therefore, the efficiency of assembling the reinforcing bars at the corners of the reinforcing bar cage can be improved.

Further, in the reinforcing bar arranging step, it is preferable to arrange the reinforcing bars to be assembled in the reinforcing bar tip assembly method.

According to this configuration, in the reinforcing bar arranging process, the reinforcing bars to be assembled in the reinforcing bar pre-assembly method in which the reinforcing bars are assembled in parallel with the placing and curing of concrete are arranged. For this reason, it is possible to improve the efficiency of assembling the reinforcing bars at the locations where a plurality of reinforcing bars are arranged adjacent to each other in the lateral direction in the reinforcing bar tip assembly method, and the advantages of the reinforcing bar tip assembly method can be further exhibited. .. Further, in the reinforcing bar pre-assembly method, the assembled reinforcing bars are moved, so that the reinforcing bar assembling jig can be efficiently removed.

Further, the present invention is a reinforcing bar assembling jig for assembling the reinforcing bars of a reinforced concrete structure in which reinforcing bars are arranged inside the concrete before placing the concrete, and a plurality of reinforcing bars in the reinforced concrete structure are laterally arranged. It is a reinforcing bar assembling jig provided with a groove portion in which a plurality of reinforcing bars are accommodated while being adjacent to each other in the lateral direction at a position corresponding to a portion where the reinforcing bars are arranged adjacent to each other in the direction.

In this case, the bottom plate in contact with the floor surface on which the reinforcing bar assembly jig is arranged, the first side plate extending upward from the first end portion of the bottom plate, and the bottom plate on the side opposite to the first end portion. It is preferable that the second side plate extending upward from the second end portion is further provided, and the groove portion is provided at the upper ends of the first side plate and the second side plate.

According to the reinforcing bar assembling method and the reinforcing bar assembling jig of the present invention, it is possible to improve the efficiency of assembling the reinforcing bars at a place where a plurality of reinforcing bars are arranged adjacent to each other in the lateral direction.

(A) is a side view of a bridge to which the reinforcing bar assembling method and the reinforcing bar assembling jig of the present embodiment are applied, and (b) is a plan view thereof. It is a side view which shows the moving work vehicle of this embodiment. FIG. 2 is a cross-sectional view taken along the line III of FIG. It is a top view which shows the main part of the mobile work vehicle of this embodiment. (A), (b), (c) and (d) are side views which show the procedure of the overhang construction by the mobile work vehicle of this embodiment in order. (A) is a side view showing a reinforcing bar assembly table of the front work floor of the mobile work vehicle of the present embodiment, and (b) is an enlarged view showing the large pull and the large underwriting jack of (a). It is a front view which shows the reinforcing bar assembling by the reinforcing bar assembling method of this embodiment, and the reinforcing bar assembling jig. It is a perspective view which shows the rebar assembly jig arranged in the jig arrangement process of this embodiment. FIG. 5 is a perspective view showing a state in which reinforcing bars are arranged on the reinforcing bar assembling jig arranged in the jig arrangement process shown in FIG. 8 in the reinforcing bar arrangement process of the present embodiment.

Hereinafter, the reinforcing bar assembling method and the embodiment of the reinforcing bar assembling jig according to the present invention will be described in detail with reference to the drawings. First, with reference to FIGS. 1 to 5, the overhanging construction of the reinforcing bar assembling method of the present embodiment and the overhanging erection method of the bridge 100 to which the reinforcing bar assembling jig is applied will be described. As shown in FIGS. 1A and 1B, the bridge 100 is a concrete structure, for example, a continuous rigid frame box girder bridge. The bridge 100 includes a plurality of piers 101 rising vertically from the ground, a stigma 103 provided above each of the piers 101, and a bridge girder 104 bridged between the stigmas 103. The bridge girder 104 has two box girders 105 extending substantially in parallel and a floor slab 107 provided on the box girder 105.

Hereinafter, in the figure, the bridge axis direction X, the bridge axis perpendicular direction Y, and the vertical direction Z are shown. The direction of the arrow in the bridge axis direction X indicates the direction in which the overhanging work proceeds (forward direction), the direction of the arrow in the direction perpendicular to the bridge axis Y indicates the left direction toward the front direction, and the direction of the arrow in the vertical direction Z. Indicates vertically above.

As shown in FIG. 3, the box girder 105 has a bottom slab 105a extending substantially horizontally and two webs 105b rising substantially vertically upward from both ends of the bottom slab 105a, in the bridge axis direction X of the box girder 105. The cross-sectional shape of the orthogonal planes is substantially rectangular. The completed box girder 105 may extend in the horizontal direction, or may extend in a direction inclined with respect to the horizontal direction. Further, the completed box girder 105 may extend straight in a plan view, or may extend curvedly. As shown in FIG. 1 (b), the box girder 105 widens in the direction perpendicular to the bridge axis Y as the distance from the stigma 103 (the stigma 103 on the left side in the drawing) that starts the overhanging erection method in the present embodiment It is assumed that you are doing.

The box girder 105 is extended one block at a time from the stigma 103 by the overhanging erection method, and gradually extends one block at a time toward another adjacent stigma 103 in the bridge axial direction X. Actually, the overhanging work in two directions of the bridge axial direction X and the opposite direction of the bridge axial direction X is executed from one stigma 103, but in this embodiment, only the one-way overhanging work will be described. .. In the following, the direction in which the box girder 105 extends by the overhanging erection method is defined as "front", and the opposite direction is defined as "rear", and words such as front / rear and front / rear are used.

Further, the portion of one block, which is the construction unit of the box girder 105, is referred to as "box girder block P". When distinguishing each box girder block P, the box girder block P of the first block, the second block, ..., The nth block counted from the column head 103 is the box girder block P1 and the box girder block, respectively. It is called P2, ..., Box girder block Pn, and so on.

As shown in FIG. 1A, a plurality of rails 123 are laid on the upper surface of the floor slab 107 in the existing portion of the bridge girder 104 (hereinafter referred to as “the existing portion 104a of the bridge girder”), and the rail 123 is the existing portion 104a of the bridge girder. It extends to the front end. A mobile work vehicle 121 used in the overhanging erection method is installed on the rail 123, and the mobile work vehicle 121 is configured to be movable on the rail 123 in the direction of the bridge axis.

The mobile work vehicle 121 is fixed to the front end portion on the rail 123, and the box girder block Pn is extended from the front end portion of the existing bridge girder portion 104a. After that, the floor slab 107 is constructed on the completed box girder block Pn, and the rail 123 is extended on the floor slab 107. Then, the moving work vehicle 121 is advanced to the tip of the rail 123, and the box girder block P (n + 1) is extended. By repeating the above, the existing bridge girder portion 104a is gradually extended.

(Mobile work vehicle)
Subsequently, the mobile work vehicle 121 will be described with reference to FIGS. 2 to 4. As shown in FIGS. 2, 3 and 4, the mobile work vehicle 121 includes a Wagen frame 130 that can move on the rail 123 in the bridge axis direction, and an upper beam 137 arranged on the Wagen frame 130. .. The Wagen frame 130 and the upper beam 137 are formed, for example, by joining a plurality of H-shaped steels. In the present specification, the Wagen frame 130 is a concept including what is called a "traveler".

As shown in FIGS. 3 and 4, the Wagen frame 130 includes four main frames 131 arranged substantially parallel to each other in the direction perpendicular to the bridge axis. As shown in FIG. 2, each of the mainframes 131 is composed of parallel quadrilateral truss structures, and the truss structures are arranged along the vertical plane. In the present specification, the mainframe 131 is a concept including what is called a "main truss". The rear bottom of the main frame 131 is fixed to the rail 123 by the anchor jack 133, and the front bottom of the main frame 131 is supported on the rail 123 by the main jack 135.

As shown in FIGS. 2, 3 and 4, the upper beam 137 is erected on these four mainframes 131. The upper beam 137 is a combination of two horizontal members 137a and 139b extending in the direction perpendicular to the bridge axis Y and three connecting members extending in the bridge axis direction X and connecting the horizontal member 137a and the horizontal member 137b. It has a beam 137c and is formed in the shape of a girder. As shown in FIG. 2, the horizontal member 137a is arranged substantially vertically above the main jack 135. The horizontal member 137b is arranged in front of the front end of the existing bridge girder portion 104a. As shown in FIGS. 2 and 4, an extension beam 132 extending further forward is provided at the front end portion of the upper portion of the main frame 131. As shown in FIG. 4, the horizontal members 134 extending in the direction perpendicular to the bridge axis are bridged to the inner two of the four mainframes 131 so as to connect the front ends of the extension beams 132 to each other. There is.

As shown in FIG. 2, at the time of overhanging construction, the portion of the main frame 131 in front of the main jack 135 is arranged so as to overhang from the front end of the existing bridge girder portion 104a. Further, as shown in FIGS. 3 and 4, each mainframe 131 is arranged at a position vertically above each of the webs 105b of the box girder 105 in view of the support strength of the existing bridge girder portion 104a.

As shown in FIG. 2, the mobile work vehicle 121 includes a formwork support portion 139 suspended by the Wagen frame 130, and a reinforcing bar tip assembly portion 141 suspended by the upper beam 137 and the horizontal member 134. The formwork support portion 139 is arranged in front of the front end of the existing bridge girder portion 104a (on the side in the overhang direction), and the reinforcing bar tip assembly portion 141 is further forward on the formwork support portion 139 (on the side in the overhang direction). Is placed in.

(Formwork support)
As shown in FIGS. 2 and 3, the formwork support portion 139 has a formwork receiving beam 143 suspended from the upper beam 137 via a plurality of hanging members 142. The rear work floor 144 of the formwork support portion 139 supports a concrete formwork (not shown) assembled in front of the existing bridge girder 104. By placing concrete in this concrete formwork, a box girder block Pn for one block is constructed in front of the existing bridge girder portion 104a. The rear work floor 144 of the formwork support portion 139 supports two formwork arranged and provided in the direction Y perpendicular to the bridge axis, corresponding to each of the two box girders 105 to be constructed.

(Reinforcing bar tip assembly)
As shown in FIG. 2, the reinforcing bar tip assembly portion 141 has a front work floor 147 suspended from the upper beam 137 and the horizontal member 134 via a plurality of suspension members 145. In the present embodiment, the front work floor 147 is the front end portion of each of the three connecting beams 137c of the upper beam 137 shown in FIGS. 3 and 4, and the direction perpendicular to the bridge axis of the horizontal member 134 shown in FIGS. 2 and 4. It is suspended and supported via a hanging member 145 at a total of 6 locations, both ends and a central portion. On the front work floor 147, the reinforcing bar 150, which is a reinforcing bar cage for use in the next box girder block P (n + 1), is assembled. As shown in FIG. 2, a reinforcing bar assembly table 170 serving as a work table for assembling the reinforcing bars 150 is installed on the front work floor 147. As will be described later, the reinforcing bar assembly table 170 is provided with a reinforcing bar assembly jig as a guide for arranging the reinforcing bars at equal pitches. In the reinforcing bar tip assembly portion 141, the reinforcing bars 150, which are two reinforcing bar cages arranged in the direction Y perpendicular to the bridge axis, are assembled corresponding to each of the two box girders 105 to be constructed.

(Trolley device)
The formwork support portion 139 and the reinforcing bar tip assembly portion 141 have a trolley device 151 for suspending and moving the reinforcing bars 150 assembled on the front work floor 147. The trolley device 151 is arranged below the extension beam 132. Further, a sufficient space for assembling and suspending the reinforcing bar 150 is secured between the trolley device 151 and the front work floor 147. The trolley device 151 has a trolley rail 153 that is suspended from an extension beam 132 by a suspension member 159 and extends in the direction of the bridge axis, and a trolley 155 that is guided by the trolley rail 153 and can move and suspend the reinforcing bar 150. ing. By providing such a reinforcing bar tip assembly portion 141, the reinforcing bar 150 for the box girder block P (n + 1) is assembled in parallel with the formwork assembly, concrete placing and curing work of the box girder block Pn. It becomes possible to operate such as.

(Wide tracking mechanism)
As mentioned above, each of the four mainframes 131 must always be placed on the web 105b of the box girder 105. Since the box girder 105 of the present embodiment gradually widens as the overhanging erection method progresses, the distance between the webs 105b of the two box girders 105 also gradually widens. Therefore, at least two mainframes 131 on the outer side of the four mainframes 131 can be translated in the direction Y perpendicular to the bridge axis. Specifically, the two outer main frames 131 and the horizontal members 137a and 137b are joined via a slide mechanism 157. Then, the slide mechanism 157 allows the two outer mainframes 131 to slide in the direction Y perpendicular to the bridge axis with respect to the horizontal members 137a and 137b. According to such a mechanism, even when the two box girders 105 widen as the overhanging erection progresses, the position of the main frame 131 in the direction perpendicular to the bridge axis Y can be followed.

(Overhang erection method)
The procedure of the overhang erection method executed by such a mobile work vehicle 121 is as follows. As shown in FIG. 5A, a moving work vehicle 121 is installed above the existing box girder block P (n-1) of the existing bridge girder block 104a, and the reinforcing bar 150 for the box girder block Pn is a formwork. It is installed on the rear work floor 144 of the support portion 139, a formwork is assembled so as to surround the reinforcing bar 150, and concrete of the box girder block Pn is cast and cured in the formwork. In parallel with this work, in the reinforcing bar tip assembly portion 141, the reinforcing bar 150 for the box girder block P (n + 1) is assembled on the front work floor 147 by using the reinforcing bar assembling jig described later.

After that, as shown in FIG. 5B, the box girder block Pn is completed, the floor slab 107 is installed on the box girder block Pn, and the rail 123 is extended on the floor slab 107. After that, the mobile work vehicle 121 is advanced and installed above the box girder block Pn. Next, as shown in FIG. 5 (c), the reinforcing bar 150 on the front work floor 147 is lifted by the trolley device 151, the reinforcing bar 150 is moved rearward by the trolley device 151, and the reinforcing bar 150 is the formwork support portion 139. It is installed on the rear work floor 144.

After that, as shown in FIG. 5D, a formwork is assembled so as to surround the reinforcing bar 150, and concrete of the box girder block P (n + 1) is cast and cured in the formwork. In parallel with this work, in the reinforcing bar tip assembly portion 141, the reinforcing bar 150 for the box girder block P (n + 2) is assembled on the front work floor 147. By repeating the above procedure, the box girder block P is formed step by step.

(Reinforcing bar assembly table)
Hereinafter, the reinforcing bar assembly jig of the present embodiment will be described. First, the reinforcing bar assembly table 170 on which the reinforcing bar assembly jig of the present embodiment is arranged will be described. As shown in FIG. 6A, the reinforcing bar assembly table 170 of the present embodiment has a plurality of floor portions 174 in which the reinforcing bars 150 are assembled and a plurality of floor portions 174 supported on the front work floor 147 of the reinforcing bar tip assembly portion 141. It has a support column 171 and. The floor portion 174 has a floor surface 177 on which a reinforcing bar assembly jig is arranged for the work of assembling the reinforcing bar 150, and a steel pipe 176 on the opposite side of the floor surface 177. A large pull 173 is attached at a position corresponding to the support column 171 of the steel pipe 176. The large pull 173 is two circular tubular steel pipes attached to the steel pipe 176 in close contact with each other.

A base of a large underwriting jack 172 is attached to the upper end of the support column 171. As shown in FIGS. 6A and 6B, the receiving portion 172s of the large underwriting jack 172 extended to a predetermined length supports the circular tubular large pulling 173, whereby the floor portion 174 is formed. It is supported by the support pillar 171. In the example of FIG. 6A, the floor portion 174 is also inclined as the box girder 105 formed extends in the bridge axis direction X while rising in the vertical direction Z. However, in the present embodiment, as shown in FIG. 6B, since the large pull 173 supported by the receiving portion 172s of the large underwriting jack 172 is cylindrical (cylindrical), the large pull 173 is a square tubular (cylindrical). Compared with the case of a prism), the large pull 173 can be stably supported by the large underwriting jack 172 even when the floor portion 174 is inclined.

(Reinforcing bar)
Next, the reinforcing bar assembling method of the present embodiment and the reinforcing bar 150 to which the reinforcing bar assembling jig is applied will be described. As shown in FIG. 7, the box girder block P in which the reinforcing bar 150 is embedded has, as described above, a bottom slab 105a extending along a substantially horizontal plane and a pair of parallel webs 105b rising substantially vertically upward from both end edges of the bottom slab 105a. It is a reinforced concrete structure having a (side wall) and has a substantially rectangular cross-sectional shape. Corresponding to the shape of the box girder block P, as shown in FIG. 7, the reinforcing bar 150 also has a cross-sectional shape in which the upper side of the same rectangle is removed.

The reinforcing bar 150 is formed in a basket shape by binding the reinforcing bars extending vertically and horizontally as described below with a binding line at an intersection. The reinforcing bars 150 are the bottom slab upper bar 15 embedded along the upper surface of the bottom slab 105a and extending in the direction Y perpendicular to the bridge axis, and the bottom slab lower bar 17 embedded along the lower surface of the bottom slab 105a and extending in the direction Y perpendicular to the bridge axis. And have. A large number of bottom slab upper bars 15 and bottom slab lower bars 17 are arranged parallel to the bridge axis direction X.

Further, the reinforcing bar 150 has a plurality of bridge axial reinforcing bars 16 extending in the bridge axial direction X directly below the bottom slab upper reinforcing bar 15 and being bound to each of the intersecting bottom slab upper reinforcing bars 15 at each intersection. Further, the reinforcing bar 150 has a plurality of bridge axial reinforcing bars 18 extending directly above the bottom slab lower bar 17 in the bridge axial direction X and being bound to each of the intersecting bottom slab lower bars 17 at each intersection. Both ends of the bottom slab lower bar 17 are bent upward along the shape of the web reinforcing bar 19 described later.

The reinforcing bar 150 includes a web reinforcing bar 19 formed in a U shape in a substantially vertical plane along the inner and outer surfaces of the web 105b. A large number of web reinforcing bars 19 are arranged parallel to the bridge axis direction X. The reinforcing bar 150 has a plurality of bridge axial reinforcing bars 20 extending in the bridge axial direction X on the outer side of the web 105b of the web reinforcing bar 19 and being bound to the intersecting web reinforcing bars 19 at each intersection. Further, the reinforcing bar 150 has a plurality of bridge axial reinforcing bars 22 extending in the bridge axial direction X on the inner side surface side of the web 105b of the web reinforcing bar 19 and being bound to the intersecting web reinforcing bars 19 at each intersection. There is. The bottom slab lower bar 17 and the lower portion of the web reinforcing bar 19 are arranged adjacent to each other while being in contact with each other in the lateral direction.

(Reinforcing bar assembly jig)
As shown in FIG. 8, a position corresponding to a position where a plurality of reinforcing bars in the reinforcing bar concrete structure are arranged adjacent to each other in the lateral direction with respect to the floor surface 177 of the reinforcing bar assembly table 170, in the present embodiment, the reinforcing bar tip. Position where the bottom slab lower reinforcing bar 17 and the lower part of the web reinforcing bar 19, which are the reinforcing bars at the corners of the reinforcing bar cage, where the reinforcing bars on the bottom surface of the reinforcing bar cage and the reinforcing bars on the side surfaces of the reinforcing bar cage are laterally adjacent to each other in the assembly method are arranged. A jig arranging step is performed in which a reinforcing bar assembling jig 180 is formed, in which a groove 181 is formed in which a plurality of bottom slab lower bars 17 and lower portions of the web reinforcing bars 19 are accommodated while being adjacent to each other in the lateral direction.

The reinforcing bar assembly jig 180 arranged in the jig arrangement process extends from the bottom plate 182 in contact with the floor surface 177 on which the reinforcing bar assembly jig 180 is arranged and the first end portion 183 of the bottom plate 182 while bending upward. It has a first side plate 184 that exists, and a second side plate 186 that extends upward from the second end portion 185 of the bottom plate 182 on the side opposite to the first end portion 183. The groove portion 181 is provided at the upper ends of the first side plate 184 and the second side plate 186. The reinforcing bar assembly jig 180 can be formed, for example, by providing the groove portion 181 on the flange of the existing channel steel (C channel). The groove 181 can be, for example, a semi-circular notch or a rectangular notch. The size of the groove portion 181 is set so that the bottom slab lower bar 17 to be arranged and the lower portion of the web reinforcing bar 19 are in close contact with each other and fixed.

As shown in FIG. 9, a reinforcing bar arranging step of arranging the reinforcing bars so that a plurality of reinforcing bars are accommodated in the groove 181 of the reinforcing bar assembling jig 180 arranged in the jig arranging process while being adjacent to each other in the lateral direction. Is done. In the present embodiment, first, the bottom slab lower bar 17 is arranged in the groove portion 181, and then the lower portion of the web reinforcing bar 19 is arranged so as to be laterally adjacent to the bottom slab lower bar 17 arranged in the groove portion 181. After that, the bottom slab upper rebar 15 and the bridge axial direction rebars 16, 18, 20, and 22 are arranged in accordance with the bottom slab lower rebar 17 and the web rebar 19, and are bound by a binding wire, and the assembly of the rebar 150 is completed.

According to the present embodiment, in the reinforcing bar assembling method for assembling the reinforcing bars of the reinforcing bar concrete structure in which the reinforcing bars are arranged inside the concrete before placing the concrete, in the jig arrangement step, a plurality of reinforcing bars in the reinforcing bar concrete structure are assembled. A reinforcing bar assembly jig 180 having a groove 181 formed in which a plurality of reinforcing bars are accommodated while being adjacent to each other in the lateral direction is arranged at a position corresponding to a position where the reinforcing bars are arranged adjacent to each other in the lateral direction. In the reinforcing bar arranging step, the reinforcing bars are arranged so that the plurality of reinforcing bars are accommodated in the groove 181 of the reinforcing bar assembling jig 180 arranged in the jig arranging step while being adjacent to each other in the lateral direction. As a result, the reinforcing bars can be arranged at an accurate position simply by arranging the reinforcing bars adjacent to the groove 181 of the reinforcing bar assembly jig 180, so that a plurality of reinforcing bars are arranged adjacent to each other in the lateral direction. It is possible to improve the efficiency of assembling the reinforcing bar at the location.

Further, in the present embodiment, the reinforcing bar assembly jig 180 arranged in the jig arrangement process includes a bottom plate 182 in contact with the floor surface 177 on which the reinforcing bar assembly jig 180 is arranged, and a first end portion 183 of the bottom plate 182. It has a first side plate 184 that extends while bending upward from the first side plate 186, and a second side plate 186 that extends while bending upward from the second end portion 185 of the bottom plate 182 on the side opposite to the first end portion 183. Since the groove portion 181 is provided at the upper ends of the first side plate 184 and the second side plate 186, the reinforcing bar assembly jig 180 can be easily formed at low cost.

Further, in the reinforcing bar arranging step in the present embodiment, the reinforcing bars at the corners of the reinforcing bar cage in which the reinforcing bars on the bottom surface of the reinforcing bar cage and the reinforcing bars on the side surfaces of the reinforcing bar cage are laterally adjacent to each other are arranged. Therefore, the efficiency of assembling the reinforcing bars at the corners of the reinforcing bar cage can be improved.

Further, in the present embodiment, in the reinforcing bar arranging step, the reinforcing bar 150 to be assembled in the reinforcing bar tip assembly method in which the reinforcing bar is assembled in parallel with the placing and curing of concrete is arranged. Therefore, it is possible to improve the efficiency of assembling the reinforcing bar 150 at the place where the plurality of bottom slab lower bars 17 and the web reinforcing bars 19 are arranged adjacent to each other in the lateral direction in the reinforcing bar tip assembly method. The advantages can be more exerted. Further, in the reinforcing bar pre-assembly method, the assembled reinforcing bar 150 is moved, so that the reinforcing bar assembling jig 180 can be efficiently removed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and is implemented in various forms. For example, in the above embodiment, the embodiment applied to the arrangement of the bottom slab lower bar 17 and the web reinforcing bar 19 to be assembled in the reinforcing bar tip assembly method has been mainly described, but the present invention is also applied to the assembly of reinforcing bars in other construction methods. It can be made, and is especially effective for assembling the corners of rebar cages.

15 ... Bottom slab upper bar, 16 ... Bridge axial reinforcement, 17 ... Bottom slab lower bar, 18 ... Bridge axial reinforcing bar, 19 ... Web reinforcing bar, 20 ... Bridge axial reinforcing bar, 22 ... Bridge axial reinforcing bar, 100 ... Bridge, 101 ... Bridge pier, 103 ... Pillar head, 104 ... Bridge girder, 104a ... Bridge girder existing part, 105 ... Box girder, 105a ... Bottom slab, 105b ... Web, 107 ... Floor slab, 121 ... Mobile work vehicle, 123 ... Rail, 130 ... Wagen frame , 131 ... Main frame, 132 ... Extension beam, 133 ... Anchor jack, 134 ... Horizontal member, 135 ... Main jack, 137 ... Upper beam, 137a, 137b ... Horizontal member, 137c ... Connecting beam, 139 ... Form support Part, 141 ... Reinforcing bar tip assembly, 142 ... Suspension material, 143 ... Form receiving beam 144 ... Rear work floor, 145 ... Suspension material, 147 ... Front work floor, 150 ... Reinforcing bar, 151 ... Trolley device, 153 ... Trolley Rails, 155 ... Trolley, 157 ... Slide mechanism, 159 ... Suspension material, 170 ... Reinforcing bar assembly stand, 171 ... Support columns, 172 ... Large underwriting jack, 172s ... Receiving part, 173 ... Large pulling, 174 ... Floor part, 176 ... Steel pipe, 177 ... Floor surface, 180 ... Reinforcing bar assembly jig, 181 ... Groove, 182 ... Bottom plate, 183 ... First end, 184 ... First side plate, 185 ... Second end, 186 ... Second side plate, X ... Bridge axis direction, Y ... Bridge axis perpendicular direction, Z ... Vertical direction.

Claims (1)

A reinforcing bar assembly method for assembling the reinforcing bars of a reinforced concrete structure in which reinforcing bars are arranged inside concrete before placing the concrete.
Reinforcing bar assembly in which a groove is formed in the reinforced concrete structure in which a plurality of the reinforcing bars are accommodated while being laterally adjacent to each other at a position corresponding to a position where the plurality of the reinforcing bars are arranged adjacent to each other in the lateral direction. Jig placement process for arranging jigs and
A reinforcing bar arranging step of arranging the reinforcing bars so that the plurality of the reinforcing bars are accommodated in the groove portion of the reinforcing bar assembling jig arranged in the jig arranging step while being adjacent to each other in the lateral direction.
A reinforcing bar assembling step of assembling the reinforcing bar by binding the reinforcing bars arranged by the reinforcing bar arranging step, and
Equipped with a,
The reinforcing bar assembly jig arranged in the jig arrangement process is
A bottom plate in contact with the floor on which the reinforcing bar assembly jig is placed, and
A first side plate extending upward while bending upward from the first end of the bottom plate,
A second side plate extending upward while bending upward from the second end of the bottom plate on the side opposite to the first end.
Have,
The groove is provided at the upper ends of the first side plate and the second side plate.
In the reinforcing bar arranging step, the reinforcing bars assembled in the reinforcing bar tip assembly method, the reinforcing bars on the bottom surface of the reinforcing bar cage and the reinforcing bars on the side surfaces of the reinforcing bar cage are laterally adjacent to each other at the corners of the reinforcing bar cage. Reinforcing bar assembly method for arranging the reinforcing bars.

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