JP3946342B2 - Bridge erection device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a bridge erection device configured to extend a bridge girder by an overhanging construction method.
[0002]
[Prior art]
Conventionally, an overhanging construction method is known as a construction method of a prestressed concrete bridge between large spans.
[0003]
This overhang construction method uses a cantilever construction work vehicle that suspends and supports a scaffold formwork (work scaffold and formwork), and casts new concrete at the tip of the bridge girder under construction to extend the bridge girder. Specifically, the construction is performed according to the following procedure.
[0004]
That is, first, after completing the construction at the concrete placement position in the previous stage, after moving the wagen forward in the direction of the bridge axis and installing it at the tip of the bridge girder, set the outer formwork at the concrete placement position, The lower slab reinforcing bar group, web reinforcing bar group and sheath connection were performed, the inner mold was set, the upper slab reinforcing bar group, laterally clamped steel material was placed and the sheath was connected, and then concrete was placed and cured. After that, tension and demolding of the PC steel material are performed.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional overhang construction method, the scaffolding formwork is suspended and fixed on the wage, and the rebar assembly work is performed at the concrete placement position, so the rebar is partially prefabricated. However, it cannot be prefabricated completely or with some joint constructions left behind. For this reason, a considerable time is required for the construction, and the construction cost is high.
[0006]
The present invention has been made in view of such circumstances, and in a bridge erection device configured to extend a bridge girder by overhanging construction, it is possible to shorten the construction period and improve the economic efficiency. The object is to provide a bridge erection device.
[0007]
[Means for Solving the Problems]
The invention of the present application achieves the above object by making the scaffold formwork a movable structure, and making it possible to transport the prefabricated rebar cage to the concrete placement position while leaving the joint construction completely or partially. It is intended to be illustrated.
[0008]
  That is, this applicationFirstThe bridge erection device according to the invention is,
  In a bridge erection device that uses a cantilever erection vehicle that supports the scaffold formwork in a suspended manner, and casts new concrete at the tip of the bridge girder under construction to extend the bridge girder,
  A scaffold formwork moving means for moving the scaffold formwork between a concrete placement position and a retreat position deviated from the concrete placement position;
  Rebar basket transport means for suspending the rebar basket at a predetermined rebar basket supply position and transporting the rebar basket to the concrete placing position.The
The rebar basket transport means includes a bridge axis direction transport means for transporting the rebar basket forward in the bridge axis direction,
The retracted position is set to a position below the concrete placing position,
The rebar basket transport means is configured to suspend the rebar basket from the bridge axis direction transport means to the scaffold formwork moving means in the middle of transport,
The bridge erection device according to the second invention of the present application is
In a bridge erection device that uses a cantilever erection vehicle that supports the scaffold formwork in a suspended manner, and casts new concrete at the tip of the bridge girder under construction to extend the bridge girder,
A scaffold formwork moving means for moving the scaffold formwork between a concrete placement position and a retreat position deviated from the concrete placement position;
Rebar basket transport means for suspending the rebar basket at a predetermined rebar basket supply position and transporting the rebar basket to the concrete placement position,
The retreat position is set to the bridge axial direction front position of the concrete placing position,It is characterized by this.
[0010]
The “reinforcing bar cage” means an assembly of all or part of reinforcing bars in advance.
[0011]
  In the second invention of the present application,The “reinforcing bar transport means” may be configured to transport the reinforcing bar cage to the concrete placement position by a single means, or after the reinforcing bar is transported halfway by the first means, It is good also as a structure which conveys to the said concrete placement position by suspending to a means (or further suspending to 3rd means etc.). In the latter case, the scaffold formwork moving means may be used as the second means (or third means or the like).
[0012]
The “predetermined reinforcing bar supply position” is not limited to a specific position as long as it is a position where the reinforcing bar can be suspended and transported to the concrete placing position. It is possible to adopt a reinforcing bar basket assembly yard installed in the vicinity of a pier or a position on a rail laid below the concrete placing position.
[0013]
[Effects of the invention]
  As shown in the above configuration, in the bridge erection device according to the present invention, the scaffold formwork suspended and supported by the cantilever construction work vehicle is moved between the concrete placement position and the retreat position by the scaffold formwork moving means. The rebar basket is transported from the rebar basket supply position to the concrete placement position by the rebar basket transport means.But,
In this case, in the first invention of the present application, the reinforcing bar transporting means includes bridge axis direction transporting means for transporting the reinforcing bar cage forward in the bridge axis direction, and the retracted position is the concrete placement position. It is set at a lower position, and the rebar basket transport means is configured to suspend the rebar basket from the bridge axis direction transport means to the scaffold formwork moving means during the transport,
In the second invention of the present application, the retreat position is set to a position in the bridge axis direction front position of the concrete placing position.Therefore, the following effects can be obtained.
[0014]
That is, with the scaffold formwork moved to the retracted position, the rebar cage is transported from the rebar basket supply position to the concrete placement position, and then the scaffold formwork is returned to the concrete placement position. By doing so, it is possible to abolish the rebar assembling work conventionally performed at the concrete placement position and to prefabricate it completely or with some joint constructions left. For this reason, construction can be performed in a short time and at low cost.
[0015]
Therefore, according to the present invention, in the bridge erection device configured to extend the bridge girder by overhanging construction, the construction period can be shortened and the economic efficiency can be improved.
[0016]
  At that time, in the first invention of the present application,, Reinforcing bar cage transport meansBut,A structure provided with a bridge axis direction moving means for conveying the reinforcing bar cage forward in the bridge axis direction;Because it isThe rebar cage can be easily transported from the rebar cage assembly yard or the like installed near the pier to the concrete placement position.
[0017]
  In the first invention of the present application,, `` Retraction position '' aboveButSet below the concrete placement positionBecauseThe scaffold formwork moving means can have a simple configuration.The On the other hand, in the second invention of the present application, the above"Evacuation position"ButSet to the front position in the bridge axis direction of the concrete placement positionBecauseEven when there is not enough space below the concrete placement position, the scaffold formwork can be easily retracted.
[0018]
  Furthermore, in the first invention of the present application,The rebar cage transport means is configured to suspend the rebar basket from the bridge axis direction moving means to the scaffold formwork moving means during the transportation.Because it isIn addition, the scaffold formwork moving means can be used as a part of the rebar basket conveying means, and the configuration of the bridge laying device can be simplified.
[0019]
  First invention of the present applicationIn the above,,After the rebar basket is transported to the tip of the bridge girder by the bridge axis direction transport means, the rebar cage is placed on the scaffolding formwork at the retracted position and the rebar cage direction transport means of the rebar cage If the structure is performed by releasing the suspended state with respect to the reinforcing bar, the rebar cage can be reworked efficiently and the rebar cage is moved by moving the scaffold formwork to the concrete placement position. At the same time, it can be moved to the concrete placement position, and the working efficiency can be improved in this respect as well.
[0020]
In addition, in any case of adopting any of the above-described configurations, it does not become a factor that determines the ability of the cantilever erection work vehicle.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0022]
First, a first embodiment of a bridge erection device according to the present invention will be described.
[0023]
FIG. 1 is a side view showing a bridge laying apparatus 10 according to the present embodiment. FIG. 2 is a left half view taken along line IIa-IIa in FIG. 1, and a right half taken along line IIb-IIb in FIG. It is an arrow view.
[0024]
As shown in these figures, the bridge erection device 10 uses a wagen 14 (cantilever erection vehicle) that suspends and supports the scaffolding formwork 12 and places new concrete at the tip of the bridge girder 2 under construction. Thus, the bridge girder 2 is formed to be extended.
[0025]
The wagegen 14 is a pair of left and right rhombus main frames 16 installed so as to protrude forward in the bridge axis direction at the tip of the bridge girder 2, and is orthogonal to the bridge axis direction at the upper ends of the pair of main frames 16. A pair of transverse beams 18A and 18B extending in the horizontal direction and connecting the two main frames 16 are provided.
[0026]
Each main frame 16 is placed on a rail 20 laid on the upper surface 2a of the bridge girder 2 and is configured to move on the rail 20 in the direction of the bridge axis by driving a motor 22. . Each main frame 16 is supported by the bridge girder 2 by the main jack 24 at the lower front end thereof, and is anchored by the anchor jack 28 in a state where the main frame 16 is prevented from jumping up by the anchor member 26 at the lower rear end thereof. Supported by the bridge girder 2 above.
[0027]
A chain 32 is suspended and supported at both left and right ends of each of the cross beams 18A and 18B via an electric chain block 30, and a channel material 34A having a predetermined length is formed so as to be adjacent to the outside of the chain 32. Suspended and supported.
[0028]
The scaffold mold 12 includes a work scaffold 36, mold receiving members 38 and 40 supported by the work scaffold 36, and an outer mold 42 supported by the mold receiving members 38 and 40. ing.
[0029]
The working scaffold 36 has a pair of front and rear cross beams 44A and 44B, which are substantially the same shape as the cross beams 18A and 18B, and are disposed immediately below the cross beams 18A and 18B, and a lower vicinity of the pair of cross beams 44A and 44B. Are connected to the lower ends of the chains 32 at the left and right ends of the horizontal beams 44A and 44B, and are suspended and supported by the horizontal beams 18A and 18B. It has come to be. Further, the short channel members 34B are fixed to the left and right end portions of the respective horizontal beams 44A, 44B so as to protrude upward so as to be located immediately below the respective channel members 34A. These short channel members 34B are pin-coupled to the lower ends of the respective channel members 34A when the chain 32 is wound up by driving the electric chain block 30 and the scaffolding formwork 12 is raised to the concrete placement position A. Thus, the scaffold formwork 12 is positioned at the concrete placement position A.
[0030]
Further, a pair of left and right height adjustment mechanisms 50 are attached to the lateral beam 18A on the front side of the wageen 14. Each of these height adjustment mechanisms 50 includes a frame 52 suspended and fixed to the cross beam 18A, a height adjustment jack 54 attached to the frame 52, and a pair of channel members suspended and supported by the frame 52. (Or PC steel bar) 56A. The pair of channel members 56A includes a pair of short channel members 56B and a pin fixed to the cross beam 44A on the front side of the scaffolding formwork 12 when the scaffolding formwork 12 is raised to the concrete placement position A. It is connected and fixed by coupling. Then, the height adjustment jack 54 is driven in a state where the coupling and fixing are performed, thereby adjusting the suspension support height position of the pair of channel members 56A with respect to the frame 52, that is, the scaffold formwork. 12 height positions are adjusted.
[0031]
On the outer side of each of the height adjusting mechanisms 50 in the front side beam 18A, when the scaffolding formwork 12 is raised to the concrete placement position A, it is connected to the front end of the formwork receiving member 38, and A pair of suspension members (deformed PC steel bars) 60 that suspend and support the formwork receiving member 38 are suspended and fixed. In addition, a pair of suspension members (deformed PC steel rods) 62 are also suspended and fixed inside the respective height adjustment mechanisms 50 in the transverse beam 18A. When the scaffolding formwork 12 is raised to the concrete placement position A, these suspension members 62 are connected to the front end portion of the formwork receiving material 66 that supports the inner formwork 64 and suspend the formwork receiving material 66. Supports the bottom. In addition, when the said scaffolding formwork 12 raises to the said concrete placement position A, the said formwork receiving material 66 is extended | stretched predetermined amount from the upper floor surface lower surface of the said bridge girder 2 to the bridge axial direction front.
[0032]
The bridge erection device 10 includes a pair of left and right rebar basket carriages 68 in addition to the wagegen 14.
[0033]
Each of the reinforcing bar transport vehicles 68 is placed on a rail 70 laid on the upper surface 2 a of the bridge girder 2 so as to be positioned outside the rail 20, and a motor mounted on the reinforcing bar transport vehicle 68. 72 is configured to be able to travel on the rail 70 in the direction of the bridge axis. Each of the rebar cage transport vehicles 68 has an upper member that protrudes to the side of the side edge of the bridge girder 2 at two front and rear positions, and an electric chain block at the side tip of each upper member. Each chain 76 is suspended and supported via 74. The lower ends of the pair of front and rear chains 76 are respectively connected to both ends of a pair of front and rear reinforcing bar cage beams 78 extending in the horizontal direction perpendicular to the bridge axis direction.
[0034]
A plurality of suspension members 80 are suspended and supported at predetermined intervals on each of the reinforcing bar support beams 78, and the reinforcement basket 4 is suspended and supported at the lower end portion of each of the suspension members 80. The rebar cage 4 is assembled in advance in a rebar cage assembly yard installed in the vicinity of the pier at the base end of the bridge girder 2 and is suspended by the pair of rebar cage carriages 68. It is transported forward in the bridge axis direction along the vicinity of the lower surface of the bridge girder 2 in the state of being supported below.
[0035]
As will be described later, the rebar cage 4 is placed on the outer form frame 42 of the scaffolding formwork 12 after each rebar cage transport vehicle 68 has moved to the tip of the bridge girder 2 and the outer formwork frame. 42, the wagon 14 is provided with a rebar cage support structure for positioning and supporting the rebar cage 4 at the concrete placement position A. Yes.
[0036]
That is, a pair of beams 82 extending in the direction of the bridge axis are provided on the lower surfaces near the left and right ends of both lateral beams 18A, 18B of the wagen 14. Each of these beams 82 is formed so as to project further to the rear than the upper member 16a of each main frame 16 of the wageen 14. A pair of suspension hooks 84 is attached to each of the beams 82 so as to be movable in the direction of the bridge axis, and the reinforcing bar cage moved to the concrete placement position A by the suspension hooks 84. 4 is suspended and supported via a suspension member (which will be described later).
[0037]
Next, the overhanging construction process by the bridge construction apparatus 10 will be described with reference to FIGS.
[0038]
First, as shown in FIG. 3, when concrete is placed at the preceding concrete placement position Ao, the PC steel is tensioned and demolded after the concrete is cured. Then, the connection between each channel material 34A and each short channel material 34B is released.
[0039]
Next, as shown in FIG. 4, the chain 32 is drawn out by driving the electric chain block 30 and the scaffolding formwork 12 is lowered by a predetermined amount. On the other hand, after the rail 70 is extended and extended to the tip of the bridge girder 2, the pair of reinforcing bar carts 68 supporting the reinforcing bar 4 in a suspended manner move forward in the bridge axis direction.
[0040]
As a result, as shown in FIG. 5, when the both-rebar cage transport vehicle 68 moves to a position just above the outer formwork 42 at the tip of the bridge girder 2, the electric chain block 74 (see FIG. 2) is driven. As a result, the chain 76 is unwound and the rebar cage 4 is lowered.
[0041]
Then, as shown in FIG. 6, when the rebar cage 4 is lowered to a position where it is placed on the outer mold frame 42, the suspension members 80 are removed from the rebar cage 4, and the chain 76 is removed. The two rebar cage transport vehicles 68 are wound up and moved rearward in the bridge axis direction toward the rebar basket supply position in the vicinity of the pier.
[0042]
Next, as shown in FIG. 7, the wageen 14 moves forward in the bridge axis direction and is installed at the tip of the bridge girder 2, and then the chain 32 is wound up by driving the electric chain block 30 to The scaffolding formwork 12 is raised. At this time, the rebar basket 4 placed on the scaffolding mold 12 is also raised together with the scaffolding mold 12.
[0043]
Thus, as shown in FIG. 8, when the scaffold formwork 12 and the reinforcing bar 4 are raised to the next concrete placement position A1, the channel members 34A and the short channel members 34B are connected. Thus, the scaffold formwork 12 is positioned at the concrete placement position A1. Next, the reinforcing steel basket 4 is suspended from the suspension hooks 84 via suspension members 86, and is set at a predetermined position of the concrete placement position A1. Further, the outer mold frame 42 is also set at a predetermined position of the concrete placing position A1, and the reinforcing bar set of the joint portion, the lateral tightening position adjustment and the sheath connection are performed. Further, the inner mold 64 (see FIG. 2) is also set at a predetermined position of the concrete placement position A1. In this state, concrete is placed at the concrete placement position A1. That is, the state returns to the same state as in FIG.
[0044]
As described above in detail, the bridge laying apparatus 10 according to the present embodiment extends the chain 32 that supports the scaffold formwork 12 by suspending it from the wagegen 14 by driving the electric chain block 30, and After the formwork 12 is moved to the retreat position below the concrete placing position A, the rebar cage 4 is suspended by the pair of left and right rebar cage carriages 68 that can move in the bridge axis direction. This is transported from the rebar cage assembly yard near the pier to the tip of the bridge girder 2, and the rebar cage 4 is placed on the scaffolding formwork 12 in the retracted position. 2, after moving the scaffold formwork 12 to the concrete placement position A, the rebar cage 4 is also moved to the concrete placement position A at the same time. Since it is done, it is possible to prefabricated leaving fully or part of the joint construction of this abolished the rebar sets work which has been done in the prior above concreting position A. For this reason, construction can be performed in a short time and at low cost.
[0045]
Therefore, according to this embodiment, in the bridge erection device configured to extend the bridge girder by overhanging construction, it is possible to shorten the construction period and improve the economic efficiency.
[0046]
Moreover, in the present embodiment, since the retracted position is set at a position below the concrete placing position A, the electric chain block 30 is newly provided on the wagen 14 with the simple configuration described above. The scaffold formwork 4 can be moved.
[0047]
Moreover, in this embodiment, by adopting the pair of reinforcing bar carts 68 to which the electric chain block 74 is attached, the reinforcing bar 4 can be easily moved from the reinforcing bar assembly yard to the tip of the bridge girder 2. Can be transported.
[0048]
Further, in the present embodiment, the reinforcing bar 4 is placed on the scaffolding formwork 12 in the retracted position and the suspended state of the reinforcing bar 4 with respect to the both reinforcing bar carriages 68 is released. Since the rebar cage 4 is suspended from the both rebar cage transport vehicles 68 to the wagegen 14, the electric chain block 30 for moving the scaffold formwork can be used as a part of the rebar transport means. This can simplify the configuration of the bridge erection device 10. Further, since the rebar cage 4 can be moved to the concrete placement position A at the same time by the movement of the scaffold formwork 12 to the concrete placement position A, the working efficiency is very high. Can do.
[0049]
Next, a second embodiment of the bridge erection device according to the present invention will be described.
[0050]
FIG. 9 is a side view showing the bridge builder 110 according to the present embodiment.
[0051]
As shown in the figure, the bridge erection device 110 also uses a wagen 114 that suspends and supports the scaffolding formwork 112 and casts new concrete at the tip of the bridge girder 2 under construction as in the bridge erection device 10. The bridge girder 2 is extended.
[0052]
The basic configuration of the wagen 114 is the same as that of the wagen 14 except that the overhanging beams 188 projecting forward in the bridge axis direction are provided on the upper surface of the upper member of the pair of left and right rhombus main frames 116, respectively. A rail 190 is laid on the upper surface of each overhanging beam 188. The pair of front and rear transverse beams 118A and 118B are placed on the rail 190 in a state where they are connected by a connecting member 192 extending in the bridge axis direction, and can be slid in the bridge axis direction by driving means (not shown). ing.
[0053]
The scaffold form 112 has substantially the same structure as the scaffold form 12, but the concrete casting is always performed by a pair of front and rear channel members 194 suspended and supported at both ends of the transverse beams 118A and 118B. It is held at the same height as the position A.
[0054]
Then, in the wagen 114, the scaffolding formwork 112 is moved between the concrete placing position A and the retracted position forward in the bridge axis direction by sliding the cross beams 118A and 118 in the bridge axis direction. Be able to.
[0055]
The bridge erection device 110 according to the present embodiment, like the bridge erection device 10, also has a pair of left and right rebar cage transport vehicles 168 that transport the rebar cage 4 from the rebar cage assembly yard near the pier to the concrete placement position A. However, the configuration of each rebar cage transport vehicle 168 is exactly the same as that of each rebar cage transport vehicle 68 described above.
[0056]
Next, the overhanging construction process by the bridge erection device 110 will be described with reference to FIGS.
[0057]
First, as shown in FIG. 10, when concrete is placed at the preceding concrete placement position Ao, the concrete is cured, and then the PC steel is tensioned and demolded.
[0058]
Next, as shown in FIG. 11, the both side beams 118A and 118B slide forward in the bridge axis direction, and the scaffolding formwork 112 is moved to the retracted position. On the other hand, after the rail 170 is laid on the bridge girder 2 so as to extend to the tip of the bridge girder 2, the pair of reinforcing bar carts 168 supporting the rebar cage 4 in a suspended manner move forward in the bridge axis direction.
[0059]
Accordingly, as shown in FIG. 12, when both the rebar cage transport vehicles 168 move to the tip of the bridge girder 2, the chains 176 that have hung the rebar cage 4 are detached from the both rebar cage transport vehicles 168. It is.
[0060]
As shown in FIG. 13, the rebar cage 4 is attached to a chain 186 that is suspended by two suspension hooks 184 at the front and rear of each beam 182 of the wagen 114. When the rebar basket 4 is rehanged in this way, both the rebar cage transport vehicles 168 move rearward in the bridge axis direction toward the rebar basket supply position near the pier.
[0061]
Next, as shown in FIG. 14, the wagen 114 moves forward in the bridge axis direction and is installed at the tip of the bridge girder 2, and then the chain 186 is wound up by driving an electric chain block (not shown). The rebar cage 4 is raised.
[0062]
As a result, as shown in FIG. 15, when the rebar cage 4 is raised to a predetermined position of the next concrete placement position A1, the lateral beams 118A and 118B slide rearward in the bridge axis direction.
[0063]
Then, by this slide, as shown in FIG. 16, when the scaffold formwork 112 is positioned at the concrete placement position A1, the outer formwork 142 is set at a predetermined position of the concrete placement position A1, and the joint Reinforcing bar assembly, lateral tightening position adjustment and sheath connection are performed. The inner mold (see the inner mold 64 in FIG. 2) is also set at a predetermined position of the concrete placement position A1. In this state, concrete is placed at the concrete placement position A1. That is, the state returns to the same state as in FIG.
[0064]
As described above in detail, the bridge laying apparatus 10 according to the present embodiment moves the scaffold formwork 112 to the retracted position forward of the concrete placement position A in the bridge axis direction by sliding the both lateral beams 118A and 118B. Then, the rebar cage 4 is suspended by the pair of left and right rebar cage carriages 168 movable in the direction of the bridge axis, and the rebar cage 4 is suspended from the rebar cage assembly yard in the vicinity of the pier. After the rebar cage 4 is suspended by the wagegen 114, the wagegen 14 is moved to the tip of the bridge girder 2 and then the rebar cage 4 is raised to the concrete placement position A. Since the scaffold formwork 112 is returned to the concrete placement position A, the rebar assembly work conventionally performed at the concrete placement position A is abolished and this is completely completed. Or it can be prefabricated by leaving a part of the joint construction. For this reason, construction can be performed in a short time and at low cost.
[0065]
Therefore, according to this embodiment, in the bridge erection device configured to extend the bridge girder by overhanging construction, it is possible to shorten the construction period and improve the economic efficiency.
[0066]
Moreover, in the present embodiment, since the retracted position is set at the bridge axial direction front position of the concrete placing position A, even when there is not enough space below the concrete placing position A, The scaffolding formwork 112 can be easily retracted to a position that does not interfere with the conveyance of the rebar basket 4.
[0067]
Also in the present embodiment, similarly to the first embodiment, the rebar cage 4 is moved from the rebar cage assembly yard to the bridge girder 2 by adopting the pair of rebar cage carriages 168 to which the electric chain block 174 is attached. It can be easily transported to the tip.
[0068]
By the way, in the said 2nd Embodiment, about the overhang construction example comprised so that it might convey to the said concrete placement position A from the rebar basket assembly yard near the said pier in the state which suspended the said rebar basket 4 Although explained, it is also possible to perform an overhang construction as shown in FIG. 17 by using the bridge construction apparatus 110 according to the second embodiment.
[0069]
That is, as shown in the figure, the scaffold formwork 112 is moved to the retracted position forward of the concrete placement position A in the bridge axis direction by sliding the transverse beams 118A and 118B. The chain 186 suspended by the two suspension hooks 184 before and after the beam 182 is extended for a long time, the rebar cage 4 is hung at the rebar basket supply position directly below the concrete placement position A, and the chain 186 is wound up. Thus, the rebar cage 4 can be raised to the concrete placement position A, and then the scaffold formwork 112 can be returned to the concrete placement position A.
[0070]
By adopting such a construction method as well as the construction method of the second embodiment, the rebar assembling work conventionally performed at the concrete placing position A is abolished and this is completely or partially performed. It can be prefabricated, leaving the joint construction. In addition, by adopting such a construction method, the construction process is extremely simplified, so that construction can be performed in a short time and at low cost.
[0071]
In addition, the reinforcing bar supply position directly below the concrete placement position A gradually changes forward in the direction of the bridge axis as the construction of the bridge girder 2 progresses. However, a rail is laid and a reinforcing bar supply cart is placed thereon. It is possible to cope with the change in the rebar basket supply position by placing it.
[Brief description of the drawings]
FIG. 1 is a side view showing a bridge erection device according to a first embodiment of the present invention.
2] Left half view taken along line IIa-IIa in FIG. 1, right half taken along line IIb-IIb in FIG.
FIG. 3 is a process diagram (No. 1) showing the procedure of overhang construction by the bridge erection device.
FIG. 4 is a process diagram showing the procedure for overhang construction (part 2).
FIG. 5 is a process diagram showing the procedure for overhang construction (Part 3).
FIG. 6 is a process diagram showing the procedure for overhang construction (Part 4).
FIG. 7 is a process diagram showing the procedure for overhang construction (No. 5).
FIG. 8 is a process diagram showing the procedure for overhang construction (No. 6)
FIG. 9 is a side view showing a bridge erection device according to a second embodiment of the present invention.
FIG. 10 is a process diagram showing the procedure of overhang construction by the bridge erection device (part 1).
FIG. 11 is a process diagram showing the procedure for overhang construction (Part 2).
FIG. 12 is a process diagram showing the procedure for overhang construction (Part 3).
FIG. 13 is a process diagram showing the procedure for overhang construction (Part 4).
FIG. 14 is a process diagram showing the procedure for overhang construction (No. 5).
FIG. 15 is a process diagram (No. 6) showing the procedure of the overhang construction work.
FIG. 16 is a process diagram (No. 7) showing the procedure of the overhang construction work.
FIG. 17 is a side view showing another overhanging construction example by the bridge erection device according to the second embodiment.
[Explanation of symbols]
2 Bridge girder
2a Top view
4 Rebar basket
10 Bridge erection device
12 scaffolding formwork
14 Wagen (cantilever erection work vehicle) (reinforcing bar cage transportation means)
16 Mainframe
18A, 18B Horizontal beam
20 rails
22 Motor
30 Electric chain block (scaffolding form moving means) (rebar cage transport means)
32 chain
34A channel material
34B short channel material
36 Working scaffold
38, 40 Formwork receiving material
42, outer formwork
44A, 44B Beam
46, 48 Lattice-like scaffold member
50 Height adjustment mechanism
52 frames
54 Height adjustment jack
56A channel material
56B short channel material
60, 62 Suspension material (deformed PC steel bar)
64 Inside formwork
66 Formwork receiving material
68 Reinforcing bar cage transport vehicle (bridge axial direction conveying means) (reinforcing bar cage conveying means)
70 rails
72 motor
74 Electric chain block
76 chain
78 Reinforcing bar cage support beam
80 Hanging material
82 Beam
84 Hanging hook
86 Hanging material
110 Bridge erection device
112 scaffold formwork
114 Wagen (cantilever erection vehicle) (reinforcing bar transport means)
116 mainframe
118A, 118B Cross beam (scaffolding formwork moving means)
142 External formwork
164 Inside formwork
168 Reinforcing Bar Carriage Car (Bridge Axis Direction Carrying Means) (Reinforcing Bar Basket Carrying Means)
170 rails
184 Hanging hook
186 chain
188
190 rails
192 connecting materials
194 Channel material
A Concrete placement position
Ao Previous concrete placement position
A1 concrete placement position

Claims (4)

In a bridge erection device that uses a cantilever erection vehicle that supports the scaffold formwork in a suspended manner, and casts new concrete at the tip of the bridge girder under construction to extend the bridge girder,
A scaffold formwork moving means for moving the scaffold formwork between a concrete placement position and a retreat position deviated from the concrete placement position;
Suspending the rebar cage at a predetermined rebar cage supply position, Ri and iron muscle car name and and a reinforcing steel cage transporting means for transporting into the concreting position,
The rebar basket transport means includes a bridge axis direction transport means for transporting the rebar basket forward in the bridge axis direction,
The retracted position is set to a position below the concrete placing position,
The bridge erection device , wherein the reinforcing bar transport means is configured to suspend the reinforcing bar cage from the bridge axial direction transport means to the scaffold formwork moving means during the transport . In the rehanging of the reinforcing bar cage, the reinforcing bar cage is placed on the scaffolding formwork at the retracted position after the reinforcing bar cage is conveyed to the tip of the bridge girder by the bridge axis direction conveying means. The bridge erection device according to claim 1 , wherein the bridge erection device is configured to be released by releasing a suspended state of the cage with respect to the bridge axial direction conveying means. In a bridge erection device that uses a cantilever erection vehicle that supports the scaffold formwork in a suspended manner, and casts new concrete at the tip of the bridge girder under construction to extend the bridge girder,
A scaffold formwork moving means for moving the scaffold formwork between a concrete placement position and a retreat position deviated from the concrete placement position;
Rebar basket transport means for suspending the rebar basket at a predetermined rebar basket supply position and transporting the rebar basket to the concrete placement position,
The retracted position is set to the bridge axis forward position of the concreting position, bridges bridging device you wherein a. 4. The bridge erection device according to claim 3 , wherein the reinforcing bar transport means includes bridge axis direction transport means for transporting the reinforcing bar cage forward in the bridge axis direction .

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