JP2018112027A - Mobile working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile working vehicle capable of improving a response to widening and narrowing width of a structure in a reinforcement prefabrication method.SOLUTION: A mobile working vehicle 121 for executing overhanging construction, comprising a wagen frame 130, a mold support part 139 for supporting a mold for concrete casting, a reinforcement prefabrication part 141 arranged closer to the side of overhanging direction than the mold support part 139 to support a reinforcing bar 150, and a scaffold unit 161 hung by the wagen frame 130 supported thereby to be a scaffold for assembling of the reinforcement 150 at the reinforcement prefabrication part 141. Thanks to a scaffold moving mechanism, the scaffold unit 161 is hung while being movable in the horizontal direction, and thanks to a scaffold fixing mechanism, the scaffold unit 161 is fixed at any position to avoid moving in the horizontal direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a mobile work vehicle.

  There has been proposed a method of performing an overhang construction in an overhang direction from an end of an existing part of a structure such as a bridge. For example, as described in Patent Document 1, there is known a reinforcing bar tip assembling method in which the reinforcing bars of the next placement portion are assembled while the concrete of the existing portion is placed and cured. In the reinforcing bar tip assembling method, a work table for assembling reinforcing bars is suspended from the overhanging portion of the wage frame of the mobile work vehicle. The rebar is assembled on this workbench. According to the rebar pre-assembly method, rebar assembly is performed in parallel with concrete placement and curing, so that the construction period can be shortened.

Japanese Patent No. 5409178

  By the way, in recent years, in a bridge superstructure, a structure in which a cross section perpendicular to a bridge axis direction is widened or contracted is increasing. In a bridge including such a wide cross section or a narrow cross section, the width of the block in the horizontal direction perpendicular to the overhang direction is expanded or narrowed in the process of overhang construction. As the blocks are expanded and contracted, the width of the reinforcing bars assembled in parallel with the placement and curing of the concrete also increases or decreases. On the other hand, when the reinforcing bars are assembled, a scaffold for assembling the reinforcing bars is installed. However, in the above technique, it is necessary to reassemble the scaffold and change the position of the scaffold every time the reinforcing bar is widened and contracted.

  Then, an object of this invention is to provide the mobile work vehicle which improved the response | compatibility to the widening and shrinking width of the structure in a reinforcing bar tip assembly method.

  The present invention is a mobile work vehicle that performs extension work in an overhanging direction from an end of an existing part of a structure, and is arranged on the upper surface of the existing part and extends on the rail, and is movable on the rail From a formwork support section, a formwork support section that supports a formwork that is arranged on the side of the projecting direction from the end, is suspended by the wageen frame, and is assembled for placing concrete. Is also placed on the side of the overhanging direction, suspended by a wage frame, supports the reinforcing bars, and a scaffolding that is suspended by the wage frame and serves as a scaffold for rebar assembly at the reinforcing bars A moving operation comprising a unit, a scaffold moving mechanism for suspending the scaffold unit so as to be movable in the horizontal direction, and a scaffold fixing mechanism for fixing the scaffold unit so as not to move in the horizontal direction at an arbitrary position. It is a car.

  According to this configuration, in a mobile work vehicle that performs overhang construction in the overhang direction from the end of the existing part of the structure, the rail that is arranged on the upper surface of the existing part and extends in the overhang direction can be moved on the rail From a formwork support section, a formwork support section that supports a formwork that is arranged on the side of the projecting direction from the end, is suspended by the wageen frame, and is assembled for placing concrete. Is also placed on the side of the overhanging direction, suspended by a wage frame, supports the reinforcing bars, and a scaffolding that is suspended by the wage frame and serves as a scaffold for rebar assembly at the reinforcing bars The scaffold unit is suspended so that it can move horizontally by the scaffold moving mechanism, and the scaffold unit does not move horizontally at any position by the scaffold fixing mechanism Because it is fixed, the position of the scaffold can be fixed after changing the horizontal position of the scaffold to an arbitrary position corresponding to the widening and shrinking width of the reinforcing bar. Correspondence to widening and shrinking can be improved.

  In this case, it is preferable that the scaffold moving mechanism is suspended so that the scaffold unit can be moved in a direction perpendicular to the extending direction.

  According to this configuration, the scaffold unit is suspended by the scaffold moving mechanism so as to be movable in a direction orthogonal to the overhanging direction, so that it becomes easier to cope with the widening and contraction of the structure in the reinforcing bar tip assembly method.

  In this case, the scaffold moving mechanism may have a trolley rail that extends in a horizontal direction and orthogonal to the extending direction, and a trolley that is slidable along the trolley rail and suspends the scaffold unit. Is preferred.

  According to this configuration, the scaffold moving mechanism includes a trolley rail that extends in a horizontal direction and orthogonal to the extending direction, and a trolley that is slidable along the trolley rail and suspends the scaffold unit. Therefore, the scaffold unit can be suspended so as to be movable in a horizontal direction with a simple configuration.

  In this case, the scaffold fixing mechanism includes an upper bracket attached to the trolley rail, a lower bracket attached to the scaffold unit, a wire that detachably connects the upper bracket and the lower bracket, a trolley rail, The jack is arranged between the scaffold unit and a jack that applies a reaction force in the direction in which the trolley rail and the scaffold unit are separated from each other, and the jack is connected to the lower bracket by the wire, and the jack is connected to the trolley rail. It is preferable that the scaffold unit is fixed so as not to move by applying a reaction force in a direction in which the scaffold unit is separated from the scaffold unit.

  According to this configuration, the scaffold fixing mechanism includes an upper bracket that is attached to the trolley rail, a lower bracket that is attached to the scaffold unit, a wire that detachably connects the upper bracket and the lower bracket, The jack is disposed between the trolley rail and the scaffolding unit and has a jack that applies a reaction force in a direction in which the trolley rail and the scaffolding unit are separated from each other, and the jack is connected to the upper bracket and the lower bracket by a wire. Because the scaffold unit is fixed so that it does not move by applying a reaction force in the direction in which the trolley rail and the scaffold unit are separated, the scaffold unit is fixed so that it does not move horizontally at an arbitrary position with a simple configuration. can do.

  According to the mobile work vehicle of the present invention, it is possible to improve the response to the widening and contraction of the structure in the reinforcing bar tip assembly method.

(A) is a side view of a bridge to which the mobile work vehicle of this embodiment is applied, and (b) is a plan view thereof. It is a side view which shows the mobile work vehicle of this embodiment. It is sectional drawing by the III line of FIG. It is a top view which shows the principal part of the mobile work vehicle of this embodiment. (A), (b), (c) and (d) are the 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 which shows the state with which the scaffold unit of the mobile work vehicle of this embodiment was fixed, (b) is a front view of (a). FIG. 7 is a front view showing a state in which the scaffold unit of FIG. 6 (b) is movable in the horizontal direction.

  Hereinafter, embodiments of a mobile work vehicle according to the present invention will be described in detail with reference to the drawings. First, with reference to FIG. 1 to FIG. 5, the overhang construction of the overhang construction method of the bridge 100 to which the mobile work vehicle of the present embodiment is applied will be described. As shown in FIGS. 1A and 1B, the bridge 100 is a concrete structure, for example, a continuous frame box girder bridge. The bridge 100 includes a plurality of piers 101 that rise in a vertical direction from the ground, a column head 103 provided on each of the piers 101, and a bridge girder 104 that is bridged between the column heads 103. The bridge girder 104 includes two box girders 105 extending substantially in parallel and a floor slab 107 provided on the box girder 105.

  Hereinafter, in the figure, a bridge axis direction X, a bridge axis perpendicular direction Y, and a vertical direction Z are shown. The direction of the arrow in the bridge axis direction X indicates the direction (front direction) in which the overhang construction proceeds, 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 upward.

  As shown in FIG. 3, the box girder 105 includes a bottom plate 105 a that extends substantially horizontally and two webs 105 b that rise substantially vertically upward from both ends of the bottom plate 105 a, and in the bridge axis direction X of the box girder 105. The cross-sectional shape by the orthogonal plane is substantially rectangular. The completed box girder 105 may extend in the horizontal direction, but 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, but may extend in a curved manner. In the present embodiment, as shown in FIGS. 1A and 1B, a case where a completed box girder 105 extends straight in the horizontal direction will be described as an example. Further, as shown in FIG. 1B, the box girder 105 is formed in a direction perpendicular to the bridge axis Y as the distance from the column head 103 (the column head 103 on the left side in the figure) that starts the overhang construction method in this embodiment increases. It is assumed that it is widened.

  As shown in FIG. 1 (a), the box girder 105 is extended from the column head 103 one block at a time by an overhanging construction method, and is bridged step by step toward another adjacent column head 103. It extends in the axial direction X. Actually, the projecting work in two directions, ie, the bridge axis direction X and the direction opposite to the bridge axis direction X, is executed from one column head 103, but in this embodiment, only the one-way projecting work will be described. . In the following, it is assumed that words such as front / rear and front / rear are used, with the direction in which the box girder 105 is extended by the overhang construction method being “front” and the opposite direction being “rear”.

  Further, a portion corresponding to one block which is a construction unit of the box girder 105 is referred to as “box girder block P”. In order to distinguish each box girder block P, the first block, the second block,..., The n-th box girder block P counted from the column head 103 are designated as box girder block P1, box girder block, respectively. P2,..., Box girder block Pn are called.

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

  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 bridge girder existing portion 104a. Thereafter, the floor slab 107 is constructed on the completed box girder block Pn, and the rail 123 is extended on the floor slab 107. And the mobile work vehicle 121 is advanced to the front-end | tip part of the rail 123, and the overhang | projection construction of the box girder block P (n + 1) is performed. By repeating the above, the existing portion 104a of the bridge girder extends stepwise.

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

  As shown in FIGS. 3 and 4, the wageen frame 130 includes four main frames 131 arranged substantially parallel to the direction perpendicular to the bridge axis. As shown in FIG. 2, each of the main frames 131 includes a parallelogram-shaped truss structure surface, and the truss structure surface is arranged along a vertical surface. In this specification, the main frame 131 is a concept including what is called a “main truss”. The rear bottom portion of the main frame 131 is fixed to the rail 123 by an anchor jack 133, and the front bottom portion 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 constructed on these four main frames 131. The upper beam 137 includes two horizontal members 137a and 139b extending in the direction Y perpendicular to the bridge axis, and three connections extending in the bridge axis direction X and connecting the horizontal members 137a and 137b. It has a beam 137c and is formed in a cross beam shape. As shown in FIG. 2, the horizontal member 137 a is disposed substantially vertically above the main jack 135. The horizontal member 137b is disposed in front of the front end of the bridge girder existing portion 104a. As shown in FIGS. 2 and 4, an extension beam 132 extending further forward is provided at the front end of the upper portion of the main frame 131. As shown in FIG. 4, for the inner two of the four main frames 131, a horizontal member 134 extending in a direction perpendicular to the bridge axis is bridged so as to connect the front ends of the extension beams 132. Yes.

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

  As shown in FIG. 2, the mobile work vehicle 121 includes a formwork support portion 139 that is suspended by a wage frame 130, and a reinforcing bar tip assembly portion 141 that is suspended by an upper beam 137 and a horizontal member 134. The formwork support part 139 is disposed in front of the front end of the bridge girder existing part 104a (in the projecting direction), and the reinforcing bar tip assembly part 141 is further in front of the formwork support part 139 (in the projecting direction side). Placed in.

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

(Rebar tip assembly)
As shown in FIG. 2, the reinforcing bar tip assembly 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 formed in the direction perpendicular to the bridge axis of the front ends of the three connecting beams 137c of the upper beam 137 shown in FIGS. 3 and 4 and the horizontal member 134 shown in FIGS. Are suspended and supported via suspension members 145 at a total of six locations including both end portions and the central portion. On the front work floor 147, a reinforcing bar 150, which is a reinforcing bar rod 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. For example, a reinforcing bar ruler is installed on the reinforcing bar assembly table 170 as a guide for arranging the reinforcing bars at an equal pitch. In addition, corresponding to each of the two box girders 105 to be constructed, in the reinforcing bar tip assembly portion 141, reinforcing bars 150 which are two reinforcing bar rods arranged in the direction Y perpendicular to the bridge axis are assembled.

(Trolley device)
The formwork support part 139 and the reinforcing bar tip assembly part 141 have a trolley device 151 for hanging and moving the reinforcing bar 150 assembled on the front work floor 147. The trolley device 151 is disposed 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 is suspended from each of the four extension beams 132 by a suspension member 159, and can move while being guided by the trolley rail 153 extending in the bridge axis direction X and the trolley rail 153, and the rebar 150 can be suspended. And a trolley 155. By providing such a reinforcing bar pre-assembled portion 141, the rebar 150 for the box girder block P (n + 1) is assembled in parallel with the work of the formwork assembly of the box girder block Pn, concrete placement and curing. Operation becomes possible.

  As shown in FIGS. 2 and 4, between the outer two and the inner two of the four trolley rails 153, the upper surface of the four trolley rails 153 is in the horizontal direction and the direction perpendicular to the bridge axis Y (stretching). A pair of trolley rails 162 extending in the direction orthogonal to the outgoing direction is bridged. The trolley rail 162 suspends a scaffold unit 161 that serves as a scaffold for assembling the reinforcing bar 150 at the reinforcing bar tip assembly 141. Details of the scaffold unit 161 will be described later.

(Widening tracking mechanism)
As described above, each of the four main frames 131 needs to be always disposed on the web 105b of the box girder 105. Since the box girder 105 of the present embodiment gradually widens as the overhanging construction method proceeds, the distance between the webs 105b of the two box girders 105 also gradually widens. Therefore, at least two outer main frames 131 among the four main frames 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 outer two main frames 131 can be slid in the direction Y perpendicular to the bridge axis with respect to the horizontal members 137a and 137b by the slide mechanism 157. According to such a mechanism, the position of the main frame 131 in the direction perpendicular to the bridge axis Y can be made to follow even when the two box girders 105 widen as the overhanging progresses.

  With the parallel movement of the two outer main frames 131, both the two outer extension beams 132 and the two outer trolley rails 153 suspended by the suspension member 159 directly below the two outer extension beams 132 Translate. Therefore, both the two outer trolley rails 153 and the trolley rail 162 that suspends the scaffold unit 161 are moved in the direction perpendicular to the bridge axis Y with respect to the trolley rail 162 by the mechanism similar to the slide mechanism 157. Can be slid.

(Overhang construction method)
The procedure of the overhanging construction method executed by such a mobile work vehicle 121 is as follows. As shown in FIG. 5 (a), the mobile work vehicle 121 is installed above the existing box girder block P (n-1) of the bridge girder existing portion 104a, and the reinforcing bar 150 for the box girder block Pn is formed into a formwork. It is installed on the rear working floor 144 of the support part 139, a formwork is assembled so as to surround the reinforcing bar 150, and concrete of the box girder block Pn is placed on the formwork and cured. In parallel with this work, in the reinforcing bar front assembly 141, the reinforcing bar 150 for the box girder block P (n + 1) is assembled on the front work floor 147 using the scaffold unit 161.

  Thereafter, 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. Thereafter, the mobile work vehicle 121 is moved forward and installed above the box girder block Pn. Next, as shown in FIG. 5C, the reinforcing bar 150 on the front work floor 147 is lifted by the trolley device 151, the reinforcing bar 150 is moved backward by the trolley device 151, and the reinforcing bar 150 is moved to the formwork support part 139. The rear working floor 144 is installed. In addition, the scaffold unit 161 is left in the reinforcing bar tip assembly portion 141.

  After that, as shown in FIG. 5 (d), a mold is assembled so as to surround the reinforcing bar 150, and concrete of a box girder block P (n + 1) is placed on the mold and cured. In parallel with this work, the reinforcing bars 150 for the box girder block P (n + 2) are assembled on the front work floor 147 in the reinforcing bar front assembly 141. By repeating the above procedure, the box girder block P is formed in stages.

(Scaffolding unit)
Hereinafter, the scaffold unit 161 of the present embodiment will be described. First, the reinforcing bar 150 assembled using the scaffold unit 161 will be described. As described above, the box girder block P in which the reinforcing bar 150 is embedded includes the bottom plate 105a extending along a substantially horizontal plane, and a pair of parallel webs 105b (side walls) rising substantially vertically upward from both end edges of the bottom plate 105a. It is a reinforced concrete structure and has a substantially rectangular cross-sectional shape. Corresponding to the shape of the box girder block P, as shown in FIG. 6B, the reinforcing bar 150 also has a cross-sectional shape obtained by removing the upper side of the same rectangle.

  Reinforcing bar 150 is formed in a hook shape by reinforcing bars that extend in the vertical and horizontal directions as described below, and are bound by a binding line at an intersection. The reinforcing bars 150 are embedded along the upper surface of the bottom slab 105a and extend in the direction perpendicular to the bridge axis Y, and the bottom slab reinforcement 17 is embedded along the lower surface of the bottom slab 105a and extends in the direction perpendicular to the bridge axis Y. And have. A large number of bottom plate upper stripes 15 and bottom plate lower stripes 17 are arranged in parallel to the bridge axis direction X.

  Further, the reinforcing bar 150 has a plurality of bridge axis direction reinforcing bars 16 extending in the bridge axis direction X immediately below the bottom plate upper bar 15 and bound to each of the intersecting bottom plate upper bars 15 at each intersection. Further, the reinforcing bar 150 has a plurality of bridge axis direction reinforcing bars 18 that extend in the bridge axis direction X directly above the bottom plate lower bar 17 and are bound to each of the intersecting bottom plate lower bars 17 at each intersection. Both ends of the bottom plate 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 so as to follow the inner surface and the outer surface of the web 105b. A large number of web rebars 19 are arranged in parallel to the bridge axis direction X. The reinforcing bar 150 extends in the bridge axis direction X on the outer surface side of the web 105b of the web reinforcing bar 19 and has a plurality of bridge axis direction reinforcing bars 20 bound to the intersecting web reinforcing bar 19 at each intersection. Further, the reinforcing bar 150 has a plurality of bridge axial rebars 22 extending in the bridge axis direction X on the inner surface side of the web 105b of the web reinforcing bar 19 and bound to the intersecting web reinforcing bar 19 at each intersection. Yes.

  As shown in FIGS. 6A and 6B, the mobile work vehicle 121 of the present embodiment is suspended by the wageen frame 130 via the trolley rail 162 as described above, and the reinforcing bar front assembly 141 The scaffold unit 161 serving as a scaffold for assembling the reinforcing bar 150 is provided. The scaffold unit 161 is formed, for example, by disposing a metal plate stage 161s on a frame formed by connecting steel pipes. In the present embodiment, the scaffold unit 161 includes a stage 161s having four heights. Two scaffolding units 161 are provided for each reinforcing bar 150, and are fixed so as to be close to the inner surface of each web 105 b of the two web reinforcing bars 19.

  The mobile work vehicle 121 includes a scaffold moving mechanism 164 that suspends the scaffold unit 161 so as to be movable in the horizontal direction, and a scaffold fixing mechanism 169 that fixes the scaffold unit 161 so as not to move in the horizontal direction at an arbitrary position. . The scaffold moving mechanism 164 suspends the scaffold unit 161 so as to be movable in the bridge axis perpendicular direction Y (direction orthogonal to the overhang direction). The scaffold moving mechanism 164 is slidable along the trolley rail 162 extending in the direction perpendicular to the bridge axis Y (the horizontal direction and perpendicular to the extending direction), and the trolley rail 162. And a hanging trolley 163. In the example of FIG. 6B, since the scaffold unit 161 is fixed by the scaffold fixing mechanism 169, the trolley 163 and the ball bracket 163f of the scaffold unit 161 are not connected. For convenience of explanation, the description of the trolley 163 is omitted from FIG.

  The scaffold fixing mechanism 169 includes an upper bracket 165 attached to the trolley rail 162, a lower bracket 166 attached to the scaffold unit, and a wire 167 detachably connecting the upper bracket 165 and the lower bracket 166. The jack 168 is disposed between the trolley rail 162 and the scaffold unit 161 and applies a reaction force in a direction in which the trolley rail 162 and the scaffold unit 161 are separated from each other.

  The upper bracket 165 is a semicircular metal member that is detachably attached to the upper surface of the trolley rail 162. The lower bracket 166 is a bracket projecting to the outside of the steel pipe that forms the framework of the scaffold unit 161 in order to fix both ends of the wire 167 passed over the upper bracket 165. As the jack 168, a general large-capacity jack can be applied. A base portion of the jack 168 is attached to a steel pipe forming a framework of the scaffold unit 161, and the receiving portion supports the trolley rail 162. The upper bracket 165 and the lower bracket 166 allow the wire 167 to be positioned outside the steel pipe forming the framework of the scaffold unit 161 so as not to obstruct the operation of the jack 168 handle.

  In a state where the upper bracket 165 and the lower bracket 166 are connected by the wire 167, the jack 168 applies a reaction force in the direction in which the trolley rail 162 and the scaffold unit 161 are separated, so that the scaffold unit 161 does not move. Fixed. On the other hand, as shown in FIG. 7, when it is necessary to move the scaffold unit 161 as the box girder 105 widens, the trolley 163 and the sling metal fitting 163f are connected by the wire 163w. The reaction force of the jack 168 is loosened and the wire 167 is removed. As a result, the scaffold unit 161 is suspended by the trolley 163 and is movable in the direction Y perpendicular to the bridge axis.

  When fixing the scaffold unit 161 so as not to move at an arbitrary position, after the upper bracket 165 is attached at an arbitrary position, the upper bracket 165 and the lower bracket 166 are connected by the wire 167. The jack 168 applies a reaction force in the direction in which the trolley rail 162 and the scaffold unit 161 are separated, and the wire 163w is removed from the trolley 163 and the ball bracket 163f, whereby the scaffold unit 161 can be fixed again.

  In this embodiment, in the mobile work vehicle 121 that performs the extension work in the extension direction from the end of the existing part of the structure, the rail 123 that is disposed on the upper surface of the existing part and extends in the extension direction, A movable wage frame 130, a mold support 139 that is disposed on the side of the projecting direction from the end, is suspended by the wage frame 130, and supports a mold assembled for placing concrete; It is arrange | positioned rather than the formwork support part 139 in the overhang | projection direction side, it is hung by the wage frame 130, the rebar front assembly part 141 which supports the rebar 150, and it is hung by the wage frame 130, and the rebar front assembly part 141 And a scaffold unit 161 that serves as a scaffold for assembling the reinforcing bar 150, and the scaffold moving mechanism 164 moves the scaffold unit 161 in the horizontal direction. Since the scaffold unit 161 is fixed so as not to move in the horizontal direction at an arbitrary position by the scaffold fixing mechanism 169, the horizontal position of the scaffold corresponding to the expansion and contraction of the reinforcing bar 150 After changing the position to an arbitrary position, the position of the scaffold can be fixed, and the response to the widening and shrinking of the structure in the reinforcing bar tip assembly method can be improved.

  In addition, according to the present embodiment, the scaffold unit 161 is suspended by the scaffold moving mechanism 164 so as to be movable in a direction orthogonal to the overhang direction, so that it is possible to cope with the widening and contraction of the structure in the reinforcing bar tip assembly method. It becomes easy to do.

  Further, according to the present embodiment, the scaffold moving mechanism 164 is slidable along the trolley rail 162 that extends in the horizontal direction and orthogonal to the protruding direction, and the trolley rail 162. Since the trolley 163 for suspending 161 is provided, the scaffold unit 161 can be suspended so as to be movable in a horizontal direction with a simple configuration.

  Further, according to the present embodiment, the scaffold fixing mechanism 169 includes the upper bracket 165 attached to the trolley rail 162, the lower bracket 166 attached to the scaffold unit 161, the upper bracket 165, and the lower bracket 166. And a wire 167 that is detachably connected to each other and a jack 168 that is disposed between the trolley rail 162 and the scaffold unit 161 and applies a reaction force in a direction in which the trolley rail 162 and the scaffold unit 161 are separated from each other. With the upper bracket 165 and the lower bracket 166 connected to each other, the jack 168 applies a reaction force in the direction in which the trolley rail 162 and the scaffold unit 161 are separated, so that the scaffold unit 161 is fixed so as not to move. Therefore, the scaffold unit 161 is not moved in the horizontal direction at an arbitrary position with a simple configuration. It can be fixed so.

  As mentioned above, although embodiment of this invention was described, this invention is implemented in various forms, without being limited to the said embodiment. For example, in the present embodiment, the case where the width of the structure to be constructed is widened has been mainly described, but the present invention is also applicable to the case where the width of the structure to be constructed is reduced. .

  DESCRIPTION OF SYMBOLS 15 ... Bottom plate upper reinforcement, 16 ... Bridge axis direction reinforcement, 17 ... Bottom plate bottom reinforcement, 18 ... Bridge axis direction reinforcement, 19 ... Web reinforcement, 20 ... Bridge axis direction reinforcement, 22 ... Bridge axis direction reinforcement, 100 ... Bridge, 101 ... Pier, 103 ... Pillar head, 104 ... Bridge girder, 104a ... Existing part of bridge girder, 105 ... Box girder, 105a ... Bottom plate, 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 ... Formwork support , 141 ... Reinforcing bar pre-assembled part, 142 ... Suspension material, 143 ... Formwork receiving beam, 144 ... Rear work floor, 145 ... Suspension material, 147 ... Front work floor, 150 ... Reinforcing bar, 151 ... Trolley device, 1 3 ... Trolley rail, 155 ... Trolley, 157 ... Slide mechanism, 159 ... Suspension material, 161 ... Scaffolding unit, 161s ... Stage, 162 ... Trolley rail, 163 ... Trolley, 163f ... Hanging bracket, 163w ... Wire, 164 ... Scaffold movement Mechanism: 165: Upper bracket, 166: Lower bracket, 167: Wire, 168: Jack, 169: Scaffolding fixing mechanism, 170: Rebar assembly, X: Bridge axis direction, Y: Bridge axis perpendicular direction, Z: Vertical direction.

Claims (4)

It is a mobile work vehicle that performs overhang construction in the overhang direction from the end of the existing part of the structure,
A rail disposed on the upper surface of the existing portion and extending in the protruding direction;
A wageen frame movable on the rail;
A formwork support part that is arranged on the side of the projecting direction from the end part, is suspended by the wageen frame, and supports a formwork assembled for placing concrete;
Reinforcing bar tip assembly part that is disposed on the side of the projecting direction from the formwork support part, is suspended by the wage frame, and supports the reinforcing bar,
A scaffold unit that is suspended by the wage frame and serves as a scaffold for assembling the rebar at the rebar tip assembly;
A scaffold moving mechanism that suspends the scaffold unit so as to be movable in the horizontal direction;
A scaffold fixing mechanism for fixing the scaffold unit so as not to move horizontally at an arbitrary position;
Mobile work vehicle equipped with.   The mobile work vehicle according to claim 1, wherein the scaffold moving mechanism suspends the scaffold unit so as to be movable in a direction orthogonal to the extending direction. The scaffold moving mechanism is
A trolley rail extending in a horizontal direction and perpendicular to the protruding direction;
A trolley that is slidable along the trolley rail and suspends the scaffold unit;
The mobile work vehicle according to claim 2, comprising: The scaffold fixing mechanism is
An upper bracket attached to the trolley rail;
A lower bracket attached to the scaffold unit;
A wire for detachably connecting the upper bracket and the lower bracket;
A jack that is disposed between the trolley rail and the scaffold unit and applies a reaction force in a direction in which the trolley rail and the scaffold unit are separated;
Have
In a state where the upper bracket and the lower bracket are connected by the wire, the jack applies a reaction force in a direction in which the trolley rail and the scaffold unit are separated so that the scaffold unit does not move. The mobile work vehicle according to claim 3, which is fixed.

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